initial commit

Signed-off-by: Florian Pritz <bluewind@xinu.at>

16 files changed, 1535 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..24e5b0a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.build
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..ce981ad
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lib/Arduino-Temperature-Control-Library"]
+	path = lib/Arduino-Temperature-Control-Library
+	url = git://github.com/milesburton/Arduino-Temperature-Control-Library.git
diff --git a/README b/README
new file mode 100644
index 0000000..d27e0df
--- /dev/null
+++ b/README
@@ -0,0 +1,3 @@
+Command for logging:
+
+> socat file:/dev/ttyACM0,nonblock,raw,echo=0,b9600 stdout | ts "%s " | sed '/NAN/d; s/ 0 / /;' > temp.log
diff --git a/lib/Arduino-Temperature-Control-Library b/lib/Arduino-Temperature-Control-Library
new file mode 160000
+Subproject 45db7e7ef84855b685d6361234a8ecd67d282c9
diff --git a/lib/DHT_sensor_library/DHT.cpp b/lib/DHT_sensor_library/DHT.cpp
new file mode 100644
index 0000000..efa1d39
--- /dev/null
+++ b/lib/DHT_sensor_library/DHT.cpp
@@ -0,0 +1,161 @@
+/* DHT library 
+
+MIT license
+written by Adafruit Industries
+*/
+
+#include "DHT.h"
+
+DHT::DHT(uint8_t pin, uint8_t type, uint8_t count) {
+  _pin = pin;
+  _type = type;
+  _count = count;
+  firstreading = true;
+}
+
+void DHT::begin(void) {
+  // set up the pins!
+  pinMode(_pin, INPUT);
+  digitalWrite(_pin, HIGH);
+  _lastreadtime = 0;
+}
+
+//boolean S == Scale.  True == Farenheit; False == Celcius
+float DHT::readTemperature(bool S) {
+  float f;
+
+  if (read()) {
+    switch (_type) {
+    case DHT11:
+      f = data[2];
+      if(S)
+      	f = convertCtoF(f);
+      	
+      return f;
+    case DHT22:
+    case DHT21:
+      f = data[2] & 0x7F;
+      f *= 256;
+      f += data[3];
+      f /= 10;
+      if (data[2] & 0x80)
+	f *= -1;
+      if(S)
+	f = convertCtoF(f);
+
+      return f;
+    }
+  }
+  Serial.print("Read fail");
+  return NAN;
+}
+
+float DHT::convertCtoF(float c) {
+	return c * 9 / 5 + 32;
+}
+
+float DHT::readHumidity(void) {
+  float f;
+  if (read()) {
+    switch (_type) {
+    case DHT11:
+      f = data[0];
+      return f;
+    case DHT22:
+    case DHT21:
+      f = data[0];
+      f *= 256;
+      f += data[1];
+      f /= 10;
+      return f;
+    }
+  }
+  Serial.print("Read fail");
+  return NAN;
+}
+
+
+boolean DHT::read(void) {
+  uint8_t laststate = HIGH;
+  uint8_t counter = 0;
+  uint8_t j = 0, i;
+  unsigned long currenttime;
+
+  // pull the pin high and wait 250 milliseconds
+  digitalWrite(_pin, HIGH);
+  delay(250);
+
+  currenttime = millis();
+  if (currenttime < _lastreadtime) {
+    // ie there was a rollover
+    _lastreadtime = 0;
+  }
+  if (!firstreading && ((currenttime - _lastreadtime) < 2000)) {
+    return true; // return last correct measurement
+    //delay(2000 - (currenttime - _lastreadtime));
+  }
+  firstreading = false;
+  /*
+    Serial.print("Currtime: "); Serial.print(currenttime);
+    Serial.print(" Lasttime: "); Serial.print(_lastreadtime);
+  */
+  _lastreadtime = millis();
+
+  data[0] = data[1] = data[2] = data[3] = data[4] = 0;
+  
+  // now pull it low for ~20 milliseconds
+  pinMode(_pin, OUTPUT);
+  digitalWrite(_pin, LOW);
+  delay(20);
+  cli();
+  digitalWrite(_pin, HIGH);
+  delayMicroseconds(40);
+  pinMode(_pin, INPUT);
+
+  // read in timings
+  for ( i=0; i< MAXTIMINGS; i++) {
+    counter = 0;
+    while (digitalRead(_pin) == laststate) {
+      counter++;
+      delayMicroseconds(1);
+      if (counter == 255) {
+        break;
+      }
+    }
+    laststate = digitalRead(_pin);
+
+    if (counter == 255) break;
+
+    // ignore first 3 transitions
+    if ((i >= 4) && (i%2 == 0)) {
+      // shove each bit into the storage bytes
+      data[j/8] <<= 1;
+      if (counter > _count)
+        data[j/8] |= 1;
+      j++;
+    }
+
+  }
+
+  sei();
+  
+  /*
+  Serial.println(j, DEC);
+  Serial.print(data[0], HEX); Serial.print(", ");
+  Serial.print(data[1], HEX); Serial.print(", ");
+  Serial.print(data[2], HEX); Serial.print(", ");
+  Serial.print(data[3], HEX); Serial.print(", ");
+  Serial.print(data[4], HEX); Serial.print(" =? ");
+  Serial.println(data[0] + data[1] + data[2] + data[3], HEX);
+  */
+
+  // check we read 40 bits and that the checksum matches
+  if ((j >= 40) && 
+      (data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)) ) {
+    return true;
+  }
+  
+
+  return false;
+
+}
diff --git a/lib/DHT_sensor_library/DHT.h b/lib/DHT_sensor_library/DHT.h
new file mode 100644
index 0000000..1c78c87
--- /dev/null
+++ b/lib/DHT_sensor_library/DHT.h
@@ -0,0 +1,39 @@
+#ifndef DHT_H

+#define DHT_H

+#if ARDUINO >= 100

+ #include "Arduino.h"

+#else

+ #include "WProgram.h"

+#endif

+

+/* DHT library 

+

+MIT license

+written by Adafruit Industries

+*/

+

+// how many timing transitions we need to keep track of. 2 * number bits + extra

+#define MAXTIMINGS 85

+

+#define DHT11 11

+#define DHT22 22

+#define DHT21 21

+#define AM2301 21

+

+class DHT {

+ private:

+  uint8_t data[6];

+  uint8_t _pin, _type, _count;

+  boolean read(void);

+  unsigned long _lastreadtime;

+  boolean firstreading;

+

+ public:

+  DHT(uint8_t pin, uint8_t type, uint8_t count=6);

+  void begin(void);

+  float readTemperature(bool S=false);

+  float convertCtoF(float);

+  float readHumidity(void);

+

+};

+#endif

diff --git a/lib/DHT_sensor_library/README.txt b/lib/DHT_sensor_library/README.txt
new file mode 100644
index 0000000..4dfcbab
--- /dev/null
+++ b/lib/DHT_sensor_library/README.txt
@@ -0,0 +1,3 @@
+This is an Arduino library for the DHT series of low cost temperature/humidity sensors. 
+
+To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder DHT. Check that the DHT folder contains DHT.cpp and DHT.h. Place the DHT library folder your <arduinosketchfolder>/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.
\ No newline at end of file
diff --git a/lib/DHT_sensor_library/examples/DHTtester/DHTtester.pde b/lib/DHT_sensor_library/examples/DHTtester/DHTtester.pde
new file mode 100644
index 0000000..8f40790
--- /dev/null
+++ b/lib/DHT_sensor_library/examples/DHTtester/DHTtester.pde
@@ -0,0 +1,44 @@
+// Example testing sketch for various DHT humidity/temperature sensors
+// Written by ladyada, public domain
+
+#include "DHT.h"
+
+#define DHTPIN 2     // what pin we're connected to
+
+// Uncomment whatever type you're using!
+//#define DHTTYPE DHT11   // DHT 11 
+#define DHTTYPE DHT22   // DHT 22  (AM2302)
+//#define DHTTYPE DHT21   // DHT 21 (AM2301)
+
+// Connect pin 1 (on the left) of the sensor to +5V
+// Connect pin 2 of the sensor to whatever your DHTPIN is
+// Connect pin 4 (on the right) of the sensor to GROUND
+// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
+
+DHT dht(DHTPIN, DHTTYPE);
+
+void setup() {
+  Serial.begin(9600); 
+  Serial.println("DHTxx test!");
+ 
+  dht.begin();
+}
+
+void loop() {
+  // Reading temperature or humidity takes about 250 milliseconds!
+  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+  float h = dht.readHumidity();
+  float t = dht.readTemperature();
+
+  // check if returns are valid, if they are NaN (not a number) then something went wrong!
+  if (isnan(t) || isnan(h)) {
+    Serial.println("Failed to read from DHT");
+  } else {
+    Serial.print("Humidity: "); 
+    Serial.print(h);
+    Serial.print(" %\t");
+    Serial.print("Temperature: "); 
+    Serial.print(t);
+    Serial.println(" *C");
+  }
+}
diff --git a/lib/OneWire/OneWire.cpp b/lib/OneWire/OneWire.cpp
new file mode 100644
index 0000000..631813f
--- /dev/null
+++ b/lib/OneWire/OneWire.cpp
@@ -0,0 +1,557 @@
+/*
+Copyright (c) 2007, Jim Studt  (original old version - many contributors since)
+
+The latest version of this library may be found at:
+  http://www.pjrc.com/teensy/td_libs_OneWire.html
+
+OneWire has been maintained by Paul Stoffregen (paul@pjrc.com) since
+January 2010.  At the time, it was in need of many bug fixes, but had
+been abandoned the original author (Jim Studt).  None of the known
+contributors were interested in maintaining OneWire.  Paul typically
+works on OneWire every 6 to 12 months.  Patches usually wait that
+long.  If anyone is interested in more actively maintaining OneWire,
+please contact Paul.
+
+Version 2.2:
+  Teensy 3.0 compatibility, Paul Stoffregen, paul@pjrc.com
+  Arduino Due compatibility, http://arduino.cc/forum/index.php?topic=141030
+  Fix DS18B20 example negative temperature
+  Fix DS18B20 example's low res modes, Ken Butcher
+  Improve reset timing, Mark Tillotson
+  Add const qualifiers, Bertrik Sikken
+  Add initial value input to crc16, Bertrik Sikken
+  Add target_search() function, Scott Roberts
+
+Version 2.1:
+  Arduino 1.0 compatibility, Paul Stoffregen
+  Improve temperature example, Paul Stoffregen
+  DS250x_PROM example, Guillermo Lovato
+  PIC32 (chipKit) compatibility, Jason Dangel, dangel.jason AT gmail.com
+  Improvements from Glenn Trewitt:
+  - crc16() now works
+  - check_crc16() does all of calculation/checking work.
+  - Added read_bytes() and write_bytes(), to reduce tedious loops.
+  - Added ds2408 example.
+  Delete very old, out-of-date readme file (info is here)
+
+Version 2.0: Modifications by Paul Stoffregen, January 2010:
+http://www.pjrc.com/teensy/td_libs_OneWire.html
+  Search fix from Robin James
+    http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295/27#27
+  Use direct optimized I/O in all cases
+  Disable interrupts during timing critical sections
+    (this solves many random communication errors)
+  Disable interrupts during read-modify-write I/O
+  Reduce RAM consumption by eliminating unnecessary
+    variables and trimming many to 8 bits
+  Optimize both crc8 - table version moved to flash
+
+Modified to work with larger numbers of devices - avoids loop.
+Tested in Arduino 11 alpha with 12 sensors.
+26 Sept 2008 -- Robin James
+http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295/27#27
+
+Updated to work with arduino-0008 and to include skip() as of
+2007/07/06. --RJL20
+
+Modified to calculate the 8-bit CRC directly, avoiding the need for
+the 256-byte lookup table to be loaded in RAM.  Tested in arduino-0010
+-- Tom Pollard, Jan 23, 2008
+
+Jim Studt's original library was modified by Josh Larios.
+
+Tom Pollard, pollard@alum.mit.edu, contributed around May 20, 2008
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Much of the code was inspired by Derek Yerger's code, though I don't
+think much of that remains.  In any event that was..
+    (copyleft) 2006 by Derek Yerger - Free to distribute freely.
+
+The CRC code was excerpted and inspired by the Dallas Semiconductor
+sample code bearing this copyright.
+//---------------------------------------------------------------------------
+// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY,  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
+// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+// Except as contained in this notice, the name of Dallas Semiconductor
+// shall not be used except as stated in the Dallas Semiconductor
+// Branding Policy.
+//--------------------------------------------------------------------------
+*/
+
+#include "OneWire.h"
+
+
+OneWire::OneWire(uint8_t pin)
+{
+	pinMode(pin, INPUT);
+	bitmask = PIN_TO_BITMASK(pin);
+	baseReg = PIN_TO_BASEREG(pin);
+#if ONEWIRE_SEARCH
+	reset_search();
+#endif
+}
+
+
+// Perform the onewire reset function.  We will wait up to 250uS for
+// the bus to come high, if it doesn't then it is broken or shorted
+// and we return a 0;
+//
+// Returns 1 if a device asserted a presence pulse, 0 otherwise.
+//
+uint8_t OneWire::reset(void)
+{
+	IO_REG_TYPE mask = bitmask;
+	volatile IO_REG_TYPE *reg IO_REG_ASM = baseReg;
+	uint8_t r;
+	uint8_t retries = 125;
+
+	noInterrupts();
+	DIRECT_MODE_INPUT(reg, mask);
+	interrupts();
+	// wait until the wire is high... just in case
+	do {
+		if (--retries == 0) return 0;
+		delayMicroseconds(2);
+	} while ( !DIRECT_READ(reg, mask));
+
+	noInterrupts();
+	DIRECT_WRITE_LOW(reg, mask);
+	DIRECT_MODE_OUTPUT(reg, mask);	// drive output low
+	interrupts();
+	delayMicroseconds(480);
+	noInterrupts();
+	DIRECT_MODE_INPUT(reg, mask);	// allow it to float
+	delayMicroseconds(70);
+	r = !DIRECT_READ(reg, mask);
+	interrupts();
+	delayMicroseconds(410);
+	return r;
+}
+
+//
+// Write a bit. Port and bit is used to cut lookup time and provide
+// more certain timing.
+//
+void OneWire::write_bit(uint8_t v)
+{
+	IO_REG_TYPE mask=bitmask;
+	volatile IO_REG_TYPE *reg IO_REG_ASM = baseReg;
+
+	if (v & 1) {
+		noInterrupts();
+		DIRECT_WRITE_LOW(reg, mask);
+		DIRECT_MODE_OUTPUT(reg, mask);	// drive output low
+		delayMicroseconds(10);
+		DIRECT_WRITE_HIGH(reg, mask);	// drive output high
+		interrupts();
+		delayMicroseconds(55);
+	} else {
+		noInterrupts();
+		DIRECT_WRITE_LOW(reg, mask);
+		DIRECT_MODE_OUTPUT(reg, mask);	// drive output low
+		delayMicroseconds(65);
+		DIRECT_WRITE_HIGH(reg, mask);	// drive output high
+		interrupts();
+		delayMicroseconds(5);
+	}
+}
+
+//
+// Read a bit. Port and bit is used to cut lookup time and provide
+// more certain timing.
+//
+uint8_t OneWire::read_bit(void)
+{
+	IO_REG_TYPE mask=bitmask;
+	volatile IO_REG_TYPE *reg IO_REG_ASM = baseReg;
+	uint8_t r;
+
+	noInterrupts();
+	DIRECT_MODE_OUTPUT(reg, mask);
+	DIRECT_WRITE_LOW(reg, mask);
+	delayMicroseconds(3);
+	DIRECT_MODE_INPUT(reg, mask);	// let pin float, pull up will raise
+	delayMicroseconds(10);
+	r = DIRECT_READ(reg, mask);
+	interrupts();
+	delayMicroseconds(53);
+	return r;
+}
+
+//
+// Write a byte. The writing code uses the active drivers to raise the
+// pin high, if you need power after the write (e.g. DS18S20 in
+// parasite power mode) then set 'power' to 1, otherwise the pin will
+// go tri-state at the end of the write to avoid heating in a short or
+// other mishap.
+//
+void OneWire::write(uint8_t v, uint8_t power /* = 0 */) {
+    uint8_t bitMask;
+
+    for (bitMask = 0x01; bitMask; bitMask <<= 1) {
+	OneWire::write_bit( (bitMask & v)?1:0);
+    }
+    if ( !power) {
+	noInterrupts();
+	DIRECT_MODE_INPUT(baseReg, bitmask);
+	DIRECT_WRITE_LOW(baseReg, bitmask);
+	interrupts();
+    }
+}
+
+void OneWire::write_bytes(const uint8_t *buf, uint16_t count, bool power /* = 0 */) {
+  for (uint16_t i = 0 ; i < count ; i++)
+    write(buf[i]);
+  if (!power) {
+    noInterrupts();
+    DIRECT_MODE_INPUT(baseReg, bitmask);
+    DIRECT_WRITE_LOW(baseReg, bitmask);
+    interrupts();
+  }
+}
+
+//
+// Read a byte
+//
+uint8_t OneWire::read() {
+    uint8_t bitMask;
+    uint8_t r = 0;
+
+    for (bitMask = 0x01; bitMask; bitMask <<= 1) {
+	if ( OneWire::read_bit()) r |= bitMask;
+    }
+    return r;
+}
+
+void OneWire::read_bytes(uint8_t *buf, uint16_t count) {
+  for (uint16_t i = 0 ; i < count ; i++)
+    buf[i] = read();
+}
+
+//
+// Do a ROM select
+//
+void OneWire::select(const uint8_t rom[8])
+{
+    uint8_t i;
+
+    write(0x55);           // Choose ROM
+
+    for (i = 0; i < 8; i++) write(rom[i]);
+}
+
+//
+// Do a ROM skip
+//
+void OneWire::skip()
+{
+    write(0xCC);           // Skip ROM
+}
+
+void OneWire::depower()
+{
+	noInterrupts();
+	DIRECT_MODE_INPUT(baseReg, bitmask);
+	interrupts();
+}
+
+#if ONEWIRE_SEARCH
+
+//
+// You need to use this function to start a search again from the beginning.
+// You do not need to do it for the first search, though you could.
+//
+void OneWire::reset_search()
+{
+  // reset the search state
+  LastDiscrepancy = 0;
+  LastDeviceFlag = FALSE;
+  LastFamilyDiscrepancy = 0;
+  for(int i = 7; ; i--) {
+    ROM_NO[i] = 0;
+    if ( i == 0) break;
+  }
+}
+
+// Setup the search to find the device type 'family_code' on the next call
+// to search(*newAddr) if it is present.
+//
+void OneWire::target_search(uint8_t family_code)
+{
+   // set the search state to find SearchFamily type devices
+   ROM_NO[0] = family_code;
+   for (uint8_t i = 1; i < 8; i++)
+      ROM_NO[i] = 0;
+   LastDiscrepancy = 64;
+   LastFamilyDiscrepancy = 0;
+   LastDeviceFlag = FALSE;
+}
+
+//
+// Perform a search. If this function returns a '1' then it has
+// enumerated the next device and you may retrieve the ROM from the
+// OneWire::address variable. If there are no devices, no further
+// devices, or something horrible happens in the middle of the
+// enumeration then a 0 is returned.  If a new device is found then
+// its address is copied to newAddr.  Use OneWire::reset_search() to
+// start over.
+//
+// --- Replaced by the one from the Dallas Semiconductor web site ---
+//--------------------------------------------------------------------------
+// Perform the 1-Wire Search Algorithm on the 1-Wire bus using the existing
+// search state.
+// Return TRUE  : device found, ROM number in ROM_NO buffer
+//        FALSE : device not found, end of search
+//
+uint8_t OneWire::search(uint8_t *newAddr)
+{
+   uint8_t id_bit_number;
+   uint8_t last_zero, rom_byte_number, search_result;
+   uint8_t id_bit, cmp_id_bit;
+
+   unsigned char rom_byte_mask, search_direction;
+
+   // initialize for search
+   id_bit_number = 1;
+   last_zero = 0;
+   rom_byte_number = 0;
+   rom_byte_mask = 1;
+   search_result = 0;
+
+   // if the last call was not the last one
+   if (!LastDeviceFlag)
+   {
+      // 1-Wire reset
+      if (!reset())
+      {
+         // reset the search
+         LastDiscrepancy = 0;
+         LastDeviceFlag = FALSE;
+         LastFamilyDiscrepancy = 0;
+         return FALSE;
+      }
+
+      // issue the search command
+      write(0xF0);
+
+      // loop to do the search
+      do
+      {
+         // read a bit and its complement
+         id_bit = read_bit();
+         cmp_id_bit = read_bit();
+
+         // check for no devices on 1-wire
+         if ((id_bit == 1) && (cmp_id_bit == 1))
+            break;
+         else
+         {
+            // all devices coupled have 0 or 1
+            if (id_bit != cmp_id_bit)
+               search_direction = id_bit;  // bit write value for search
+            else
+            {
+               // if this discrepancy if before the Last Discrepancy
+               // on a previous next then pick the same as last time
+               if (id_bit_number < LastDiscrepancy)
+                  search_direction = ((ROM_NO[rom_byte_number] & rom_byte_mask) > 0);
+               else
+                  // if equal to last pick 1, if not then pick 0
+                  search_direction = (id_bit_number == LastDiscrepancy);
+
+               // if 0 was picked then record its position in LastZero
+               if (search_direction == 0)
+               {
+                  last_zero = id_bit_number;
+
+                  // check for Last discrepancy in family
+                  if (last_zero < 9)
+                     LastFamilyDiscrepancy = last_zero;
+               }
+            }
+
+            // set or clear the bit in the ROM byte rom_byte_number
+            // with mask rom_byte_mask
+            if (search_direction == 1)
+              ROM_NO[rom_byte_number] |= rom_byte_mask;
+            else
+              ROM_NO[rom_byte_number] &= ~rom_byte_mask;
+
+            // serial number search direction write bit
+            write_bit(search_direction);
+
+            // increment the byte counter id_bit_number
+            // and shift the mask rom_byte_mask
+            id_bit_number++;
+            rom_byte_mask <<= 1;
+
+            // if the mask is 0 then go to new SerialNum byte rom_byte_number and reset mask
+            if (rom_byte_mask == 0)
+            {
+                rom_byte_number++;
+                rom_byte_mask = 1;
+            }
+         }
+      }
+      while(rom_byte_number < 8);  // loop until through all ROM bytes 0-7
+
+      // if the search was successful then
+      if (!(id_bit_number < 65))
+      {
+         // search successful so set LastDiscrepancy,LastDeviceFlag,search_result
+         LastDiscrepancy = last_zero;
+
+         // check for last device
+         if (LastDiscrepancy == 0)
+            LastDeviceFlag = TRUE;
+
+         search_result = TRUE;
+      }
+   }
+
+   // if no device found then reset counters so next 'search' will be like a first
+   if (!search_result || !ROM_NO[0])
+   {
+      LastDiscrepancy = 0;
+      LastDeviceFlag = FALSE;
+      LastFamilyDiscrepancy = 0;
+      search_result = FALSE;
+   }
+   for (int i = 0; i < 8; i++) newAddr[i] = ROM_NO[i];
+   return search_result;
+  }
+
+#endif
+
+#if ONEWIRE_CRC
+// The 1-Wire CRC scheme is described in Maxim Application Note 27:
+// "Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products"
+//
+
+#if ONEWIRE_CRC8_TABLE
+// This table comes from Dallas sample code where it is freely reusable,
+// though Copyright (C) 2000 Dallas Semiconductor Corporation
+static const uint8_t PROGMEM dscrc_table[] = {
+      0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
+    157,195, 33,127,252,162, 64, 30, 95,  1,227,189, 62, 96,130,220,
+     35,125,159,193, 66, 28,254,160,225,191, 93,  3,128,222, 60, 98,
+    190,224,  2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
+     70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89,  7,
+    219,133,103, 57,186,228,  6, 88, 25, 71,165,251,120, 38,196,154,
+    101, 59,217,135,  4, 90,184,230,167,249, 27, 69,198,152,122, 36,
+    248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91,  5,231,185,
+    140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
+     17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
+    175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
+     50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
+    202,148,118, 40,171,245, 23, 73,  8, 86,180,234,105, 55,213,139,
+     87,  9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
+    233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
+    116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53};
+
+//
+// Compute a Dallas Semiconductor 8 bit CRC. These show up in the ROM
+// and the registers.  (note: this might better be done without to
+// table, it would probably be smaller and certainly fast enough
+// compared to all those delayMicrosecond() calls.  But I got
+// confused, so I use this table from the examples.)
+//
+uint8_t OneWire::crc8(const uint8_t *addr, uint8_t len)
+{
+	uint8_t crc = 0;
+
+	while (len--) {
+		crc = pgm_read_byte(dscrc_table + (crc ^ *addr++));
+	}
+	return crc;
+}
+#else
+//
+// Compute a Dallas Semiconductor 8 bit CRC directly.
+// this is much slower, but much smaller, than the lookup table.
+//
+uint8_t OneWire::crc8(const uint8_t *addr, uint8_t len)
+{
+	uint8_t crc = 0;
+	
+	while (len--) {
+		uint8_t inbyte = *addr++;
+		for (uint8_t i = 8; i; i--) {
+			uint8_t mix = (crc ^ inbyte) & 0x01;
+			crc >>= 1;
+			if (mix) crc ^= 0x8C;
+			inbyte >>= 1;
+		}
+	}
+	return crc;
+}
+#endif
+
+#if ONEWIRE_CRC16
+bool OneWire::check_crc16(const uint8_t* input, uint16_t len, const uint8_t* inverted_crc, uint16_t crc)
+{
+    crc = ~crc16(input, len, crc);
+    return (crc & 0xFF) == inverted_crc[0] && (crc >> 8) == inverted_crc[1];
+}
+
+uint16_t OneWire::crc16(const uint8_t* input, uint16_t len, uint16_t crc)
+{
+    static const uint8_t oddparity[16] =
+        { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 };
+
+    for (uint16_t i = 0 ; i < len ; i++) {
+      // Even though we're just copying a byte from the input,
+      // we'll be doing 16-bit computation with it.
+      uint16_t cdata = input[i];
+      cdata = (cdata ^ crc) & 0xff;
+      crc >>= 8;
+
+      if (oddparity[cdata & 0x0F] ^ oddparity[cdata >> 4])
+          crc ^= 0xC001;
+
+      cdata <<= 6;
+      crc ^= cdata;
+      cdata <<= 1;
+      crc ^= cdata;
+    }
+    return crc;
+}
+#endif
+
+#endif
diff --git a/lib/OneWire/OneWire.h b/lib/OneWire/OneWire.h
new file mode 100644
index 0000000..916c529
--- /dev/null
+++ b/lib/OneWire/OneWire.h
@@ -0,0 +1,229 @@
+#ifndef OneWire_h
+#define OneWire_h
+
+#include <inttypes.h>
+
+#if ARDUINO >= 100
+#include "Arduino.h"       // for delayMicroseconds, digitalPinToBitMask, etc
+#else
+#include "WProgram.h"      // for delayMicroseconds
+#include "pins_arduino.h"  // for digitalPinToBitMask, etc
+#endif
+
+// You can exclude certain features from OneWire.  In theory, this
+// might save some space.  In practice, the compiler automatically
+// removes unused code (technically, the linker, using -fdata-sections
+// and -ffunction-sections when compiling, and Wl,--gc-sections
+// when linking), so most of these will not result in any code size
+// reduction.  Well, unless you try to use the missing features
+// and redesign your program to not need them!  ONEWIRE_CRC8_TABLE
+// is the exception, because it selects a fast but large algorithm
+// or a small but slow algorithm.
+
+// you can exclude onewire_search by defining that to 0
+#ifndef ONEWIRE_SEARCH
+#define ONEWIRE_SEARCH 1
+#endif
+
+// You can exclude CRC checks altogether by defining this to 0
+#ifndef ONEWIRE_CRC
+#define ONEWIRE_CRC 1
+#endif
+
+// Select the table-lookup method of computing the 8-bit CRC
+// by setting this to 1.  The lookup table enlarges code size by
+// about 250 bytes.  It does NOT consume RAM (but did in very
+// old versions of OneWire).  If you disable this, a slower
+// but very compact algorithm is used.
+#ifndef ONEWIRE_CRC8_TABLE
+#define ONEWIRE_CRC8_TABLE 1
+#endif
+
+// You can allow 16-bit CRC checks by defining this to 1
+// (Note that ONEWIRE_CRC must also be 1.)
+#ifndef ONEWIRE_CRC16
+#define ONEWIRE_CRC16 1
+#endif
+
+#define FALSE 0
+#define TRUE  1
+
+// Platform specific I/O definitions
+
+#if defined(__AVR__)
+#define PIN_TO_BASEREG(pin)             (portInputRegister(digitalPinToPort(pin)))
+#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
+#define IO_REG_TYPE uint8_t
+#define IO_REG_ASM asm("r30")
+#define DIRECT_READ(base, mask)         (((*(base)) & (mask)) ? 1 : 0)
+#define DIRECT_MODE_INPUT(base, mask)   ((*((base)+1)) &= ~(mask))
+#define DIRECT_MODE_OUTPUT(base, mask)  ((*((base)+1)) |= (mask))
+#define DIRECT_WRITE_LOW(base, mask)    ((*((base)+2)) &= ~(mask))
+#define DIRECT_WRITE_HIGH(base, mask)   ((*((base)+2)) |= (mask))
+
+#elif defined(__MK20DX128__)
+#define PIN_TO_BASEREG(pin)             (portOutputRegister(pin))
+#define PIN_TO_BITMASK(pin)             (1)
+#define IO_REG_TYPE uint8_t
+#define IO_REG_ASM
+#define DIRECT_READ(base, mask)         (*((base)+512))
+#define DIRECT_MODE_INPUT(base, mask)   (*((base)+640) = 0)
+#define DIRECT_MODE_OUTPUT(base, mask)  (*((base)+640) = 1)
+#define DIRECT_WRITE_LOW(base, mask)    (*((base)+256) = 1)
+#define DIRECT_WRITE_HIGH(base, mask)   (*((base)+128) = 1)
+
+#elif defined(__SAM3X8E__)
+// Arduino 1.5.1 may have a bug in delayMicroseconds() on Arduino Due.
+// http://arduino.cc/forum/index.php/topic,141030.msg1076268.html#msg1076268
+// If you have trouble with OneWire on Arduino Due, please check the
+// status of delayMicroseconds() before reporting a bug in OneWire!
+#define PIN_TO_BASEREG(pin)             (&(digitalPinToPort(pin)->PIO_PER))
+#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
+#define IO_REG_TYPE uint32_t
+#define IO_REG_ASM
+#define DIRECT_READ(base, mask)         (((*((base)+15)) & (mask)) ? 1 : 0)
+#define DIRECT_MODE_INPUT(base, mask)   ((*((base)+5)) = (mask))
+#define DIRECT_MODE_OUTPUT(base, mask)  ((*((base)+4)) = (mask))
+#define DIRECT_WRITE_LOW(base, mask)    ((*((base)+13)) = (mask))
+#define DIRECT_WRITE_HIGH(base, mask)   ((*((base)+12)) = (mask))
+#ifndef PROGMEM
+#define PROGMEM
+#endif
+#ifndef pgm_read_byte
+#define pgm_read_byte(addr) (*(const uint8_t *)(addr))
+#endif
+
+#elif defined(__PIC32MX__)
+#define PIN_TO_BASEREG(pin)             (portModeRegister(digitalPinToPort(pin)))
+#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
+#define IO_REG_TYPE uint32_t
+#define IO_REG_ASM
+#define DIRECT_READ(base, mask)         (((*(base+4)) & (mask)) ? 1 : 0)  //PORTX + 0x10
+#define DIRECT_MODE_INPUT(base, mask)   ((*(base+2)) = (mask))            //TRISXSET + 0x08
+#define DIRECT_MODE_OUTPUT(base, mask)  ((*(base+1)) = (mask))            //TRISXCLR + 0x04
+#define DIRECT_WRITE_LOW(base, mask)    ((*(base+8+1)) = (mask))          //LATXCLR  + 0x24
+#define DIRECT_WRITE_HIGH(base, mask)   ((*(base+8+2)) = (mask))          //LATXSET + 0x28
+
+#else
+#error "Please define I/O register types here"
+#endif
+
+
+class OneWire
+{
+  private:
+    IO_REG_TYPE bitmask;
+    volatile IO_REG_TYPE *baseReg;
+
+#if ONEWIRE_SEARCH
+    // global search state
+    unsigned char ROM_NO[8];
+    uint8_t LastDiscrepancy;
+    uint8_t LastFamilyDiscrepancy;
+    uint8_t LastDeviceFlag;
+#endif
+
+  public:
+    OneWire( uint8_t pin);
+
+    // Perform a 1-Wire reset cycle. Returns 1 if a device responds
+    // with a presence pulse.  Returns 0 if there is no device or the
+    // bus is shorted or otherwise held low for more than 250uS
+    uint8_t reset(void);
+
+    // Issue a 1-Wire rom select command, you do the reset first.
+    void select(const uint8_t rom[8]);
+
+    // Issue a 1-Wire rom skip command, to address all on bus.
+    void skip(void);
+
+    // Write a byte. If 'power' is one then the wire is held high at
+    // the end for parasitically powered devices. You are responsible
+    // for eventually depowering it by calling depower() or doing
+    // another read or write.
+    void write(uint8_t v, uint8_t power = 0);
+
+    void write_bytes(const uint8_t *buf, uint16_t count, bool power = 0);
+
+    // Read a byte.
+    uint8_t read(void);
+
+    void read_bytes(uint8_t *buf, uint16_t count);
+
+    // Write a bit. The bus is always left powered at the end, see
+    // note in write() about that.
+    void write_bit(uint8_t v);
+
+    // Read a bit.
+    uint8_t read_bit(void);
+
+    // Stop forcing power onto the bus. You only need to do this if
+    // you used the 'power' flag to write() or used a write_bit() call
+    // and aren't about to do another read or write. You would rather
+    // not leave this powered if you don't have to, just in case
+    // someone shorts your bus.
+    void depower(void);
+
+#if ONEWIRE_SEARCH
+    // Clear the search state so that if will start from the beginning again.
+    void reset_search();
+
+    // Setup the search to find the device type 'family_code' on the next call
+    // to search(*newAddr) if it is present.
+    void target_search(uint8_t family_code);
+
+    // Look for the next device. Returns 1 if a new address has been
+    // returned. A zero might mean that the bus is shorted, there are
+    // no devices, or you have already retrieved all of them.  It
+    // might be a good idea to check the CRC to make sure you didn't
+    // get garbage.  The order is deterministic. You will always get
+    // the same devices in the same order.
+    uint8_t search(uint8_t *newAddr);
+#endif
+
+#if ONEWIRE_CRC
+    // Compute a Dallas Semiconductor 8 bit CRC, these are used in the
+    // ROM and scratchpad registers.
+    static uint8_t crc8(const uint8_t *addr, uint8_t len);
+
+#if ONEWIRE_CRC16
+    // Compute the 1-Wire CRC16 and compare it against the received CRC.
+    // Example usage (reading a DS2408):
+    //    // Put everything in a buffer so we can compute the CRC easily.
+    //    uint8_t buf[13];
+    //    buf[0] = 0xF0;    // Read PIO Registers
+    //    buf[1] = 0x88;    // LSB address
+    //    buf[2] = 0x00;    // MSB address
+    //    WriteBytes(net, buf, 3);    // Write 3 cmd bytes
+    //    ReadBytes(net, buf+3, 10);  // Read 6 data bytes, 2 0xFF, 2 CRC16
+    //    if (!CheckCRC16(buf, 11, &buf[11])) {
+    //        // Handle error.
+    //    }     
+    //          
+    // @param input - Array of bytes to checksum.
+    // @param len - How many bytes to use.
+    // @param inverted_crc - The two CRC16 bytes in the received data.
+    //                       This should just point into the received data,
+    //                       *not* at a 16-bit integer.
+    // @param crc - The crc starting value (optional)
+    // @return True, iff the CRC matches.
+    static bool check_crc16(const uint8_t* input, uint16_t len, const uint8_t* inverted_crc, uint16_t crc = 0);
+
+    // Compute a Dallas Semiconductor 16 bit CRC.  This is required to check
+    // the integrity of data received from many 1-Wire devices.  Note that the
+    // CRC computed here is *not* what you'll get from the 1-Wire network,
+    // for two reasons:
+    //   1) The CRC is transmitted bitwise inverted.
+    //   2) Depending on the endian-ness of your processor, the binary
+    //      representation of the two-byte return value may have a different
+    //      byte order than the two bytes you get from 1-Wire.
+    // @param input - Array of bytes to checksum.
+    // @param len - How many bytes to use.
+    // @param crc - The crc starting value (optional)
+    // @return The CRC16, as defined by Dallas Semiconductor.
+    static uint16_t crc16(const uint8_t* input, uint16_t len, uint16_t crc = 0);
+#endif
+#endif
+};
+
+#endif
diff --git a/lib/OneWire/examples/DS18x20_Temperature/DS18x20_Temperature.pde b/lib/OneWire/examples/DS18x20_Temperature/DS18x20_Temperature.pde
new file mode 100644
index 0000000..68ca194
--- /dev/null
+++ b/lib/OneWire/examples/DS18x20_Temperature/DS18x20_Temperature.pde
@@ -0,0 +1,112 @@
+#include <OneWire.h>
+
+// OneWire DS18S20, DS18B20, DS1822 Temperature Example
+//
+// http://www.pjrc.com/teensy/td_libs_OneWire.html
+//
+// The DallasTemperature library can do all this work for you!
+// http://milesburton.com/Dallas_Temperature_Control_Library
+
+OneWire  ds(10);  // on pin 10 (a 4.7K resistor is necessary)
+
+void setup(void) {
+  Serial.begin(9600);
+}
+
+void loop(void) {
+  byte i;
+  byte present = 0;
+  byte type_s;
+  byte data[12];
+  byte addr[8];
+  float celsius, fahrenheit;
+  
+  if ( !ds.search(addr)) {
+    Serial.println("No more addresses.");
+    Serial.println();
+    ds.reset_search();
+    delay(250);
+    return;
+  }
+  
+  Serial.print("ROM =");
+  for( i = 0; i < 8; i++) {
+    Serial.write(' ');
+    Serial.print(addr[i], HEX);
+  }
+
+  if (OneWire::crc8(addr, 7) != addr[7]) {
+      Serial.println("CRC is not valid!");
+      return;
+  }
+  Serial.println();
+ 
+  // the first ROM byte indicates which chip
+  switch (addr[0]) {
+    case 0x10:
+      Serial.println("  Chip = DS18S20");  // or old DS1820
+      type_s = 1;
+      break;
+    case 0x28:
+      Serial.println("  Chip = DS18B20");
+      type_s = 0;
+      break;
+    case 0x22:
+      Serial.println("  Chip = DS1822");
+      type_s = 0;
+      break;
+    default:
+      Serial.println("Device is not a DS18x20 family device.");
+      return;
+  } 
+
+  ds.reset();
+  ds.select(addr);
+  ds.write(0x44, 1);        // start conversion, with parasite power on at the end
+  
+  delay(1000);     // maybe 750ms is enough, maybe not
+  // we might do a ds.depower() here, but the reset will take care of it.
+  
+  present = ds.reset();
+  ds.select(addr);    
+  ds.write(0xBE);         // Read Scratchpad
+
+  Serial.print("  Data = ");
+  Serial.print(present, HEX);
+  Serial.print(" ");
+  for ( i = 0; i < 9; i++) {           // we need 9 bytes
+    data[i] = ds.read();
+    Serial.print(data[i], HEX);
+    Serial.print(" ");
+  }
+  Serial.print(" CRC=");
+  Serial.print(OneWire::crc8(data, 8), HEX);
+  Serial.println();
+
+  // Convert the data to actual temperature
+  // because the result is a 16 bit signed integer, it should
+  // be stored to an "int16_t" type, which is always 16 bits
+  // even when compiled on a 32 bit processor.
+  int16_t raw = (data[1] << 8) | data[0];
+  if (type_s) {
+    raw = raw << 3; // 9 bit resolution default
+    if (data[7] == 0x10) {
+      // "count remain" gives full 12 bit resolution
+      raw = (raw & 0xFFF0) + 12 - data[6];
+    }
+  } else {
+    byte cfg = (data[4] & 0x60);
+    // at lower res, the low bits are undefined, so let's zero them
+    if (cfg == 0x00) raw = raw & ~7;  // 9 bit resolution, 93.75 ms
+    else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
+    else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
+    //// default is 12 bit resolution, 750 ms conversion time
+  }
+  celsius = (float)raw / 16.0;
+  fahrenheit = celsius * 1.8 + 32.0;
+  Serial.print("  Temperature = ");
+  Serial.print(celsius);
+  Serial.print(" Celsius, ");
+  Serial.print(fahrenheit);
+  Serial.println(" Fahrenheit");
+}
diff --git a/lib/OneWire/examples/DS2408_Switch/DS2408_Switch.pde b/lib/OneWire/examples/DS2408_Switch/DS2408_Switch.pde
new file mode 100644
index 0000000..d171f9b
--- /dev/null
+++ b/lib/OneWire/examples/DS2408_Switch/DS2408_Switch.pde
@@ -0,0 +1,77 @@
+#include <OneWire.h>
+
+/*
+ * DS2408 8-Channel Addressable Switch
+ *
+ * Writte by Glenn Trewitt, glenn at trewitt dot org
+ *
+ * Some notes about the DS2408:
+ *   - Unlike most input/output ports, the DS2408 doesn't have mode bits to
+ *       set whether the pins are input or output.  If you issue a read command,
+ *       they're inputs.  If you write to them, they're outputs.
+ *   - For reading from a switch, you should use 10K pull-up resisters.
+ */
+
+void PrintBytes(uint8_t* addr, uint8_t count, bool newline=0) {
+  for (uint8_t i = 0; i < count; i++) {
+    Serial.print(addr[i]>>4, HEX);
+    Serial.print(addr[i]&0x0f, HEX);
+  }
+  if (newline)
+    Serial.println();
+}
+
+void ReadAndReport(OneWire* net, uint8_t* addr) {
+  Serial.print("  Reading DS2408 ");
+  PrintBytes(addr, 8);
+  Serial.println();
+	
+  uint8_t buf[13];  // Put everything in the buffer so we can compute CRC easily.
+  buf[0] = 0xF0;    // Read PIO Registers
+  buf[1] = 0x88;    // LSB address
+  buf[2] = 0x00;    // MSB address
+  net->write_bytes(buf, 3);
+  net->read_bytes(buf+3, 10);     // 3 cmd bytes, 6 data bytes, 2 0xFF, 2 CRC16
+  net->reset();
+
+  if (!OneWire::check_crc16(buf, 11, &buf[11])) {
+    Serial.print("CRC failure in DS2408 at ");
+    PrintBytes(addr, 8, true);
+    return;
+  }
+  Serial.print("  DS2408 data = ");
+  // First 3 bytes contain command, register address.
+  Serial.println(buf[3], BIN);
+}
+
+OneWire net(10);  // on pin 10
+
+void setup(void) {
+  Serial.begin(9600);
+}
+
+void loop(void) {
+  byte i;
+  byte present = 0;
+  byte addr[8];
+  
+  if (!net.search(addr)) {
+    Serial.print("No more addresses.\n");
+    net.reset_search();
+    delay(1000);
+    return;
+  }
+  
+  if (OneWire::crc8(addr, 7) != addr[7]) {
+    Serial.print("CRC is not valid!\n");
+    return;
+  }
+  
+  if (addr[0] != 0x29) {
+    PrintBytes(addr, 8);
+    Serial.print(" is not a DS2408.\n");
+    return;
+  }
+
+  ReadAndReport(&net, addr);
+}
diff --git a/lib/OneWire/examples/DS250x_PROM/DS250x_PROM.pde b/lib/OneWire/examples/DS250x_PROM/DS250x_PROM.pde
new file mode 100644
index 0000000..baa51c8
--- /dev/null
+++ b/lib/OneWire/examples/DS250x_PROM/DS250x_PROM.pde
@@ -0,0 +1,90 @@
+/*
+DS250x add-only programmable memory reader w/SKIP ROM.
+ 
+ The DS250x is a 512/1024bit add-only PROM(you can add data but cannot change the old one) that's used mainly for device identification purposes
+ like serial number, mfgr data, unique identifiers, etc. It uses the Maxim 1-wire bus.
+ 
+ This sketch will use the SKIP ROM function that skips the 1-Wire search phase since we only have one device connected in the bus on digital pin 6.
+ If more than one device is connected to the bus, it will fail.
+ Sketch will not verify if device connected is from the DS250x family since the skip rom function effectively skips the family-id byte readout.
+ thus it is possible to run this sketch with any Maxim OneWire device in which case the command CRC will most likely fail.
+ Sketch will only read the first page of memory(32bits) starting from the lower address(0000h), if more than 1 device is present, then use the sketch with search functions.
+ Remember to put a 4.7K pullup resistor between pin 6 and +Vcc
+ 
+ To change the range or ammount of data to read, simply change the data array size, LSB/MSB addresses and for loop iterations
+ 
+ This example code is in the public domain and is provided AS-IS.
+ 
+ Built with Arduino 0022 and PJRC OneWire 2.0 library http://www.pjrc.com/teensy/td_libs_OneWire.html
+ 
+ created by Guillermo Lovato <glovato@gmail.com>
+ march/2011
+ 
+ */
+
+#include <OneWire.h>
+OneWire ds(6);                    // OneWire bus on digital pin 6
+void setup() {
+  Serial.begin (9600);
+}
+
+void loop() {
+  byte i;                         // This is for the for loops
+  boolean present;                // device present var
+  byte data[32];                  // container for the data from device
+  byte leemem[3] = {              // array with the commands to initiate a read, DS250x devices expect 3 bytes to start a read: command,LSB&MSB adresses
+    0xF0 , 0x00 , 0x00   };       // 0xF0 is the Read Data command, followed by 00h 00h as starting address(the beginning, 0000h)
+  byte ccrc;                      // Variable to store the command CRC
+  byte ccrc_calc;
+
+  present = ds.reset();           // OneWire bus reset, always needed to start operation on the bus, returns a 1/TRUE if there's a device present.
+  ds.skip();                      // Skip ROM search
+
+  if (present == TRUE){           // We only try to read the data if there's a device present 
+    Serial.println("DS250x device present");
+    ds.write(leemem[0],1);        // Read data command, leave ghost power on
+    ds.write(leemem[1],1);        // LSB starting address, leave ghost power on
+    ds.write(leemem[2],1);        // MSB starting address, leave ghost power on
+
+    ccrc = ds.read();             // DS250x generates a CRC for the command we sent, we assign a read slot and store it's value
+    ccrc_calc = OneWire::crc8(leemem, 3);  // We calculate the CRC of the commands we sent using the library function and store it
+
+    if ( ccrc_calc != ccrc) {      // Then we compare it to the value the ds250x calculated, if it fails, we print debug messages and abort
+      Serial.println("Invalid command CRC!");
+      Serial.print("Calculated CRC:");
+      Serial.println(ccrc_calc,HEX);    // HEX makes it easier to observe and compare
+      Serial.print("DS250x readback CRC:");
+      Serial.println(ccrc,HEX);
+      return;                      // Since CRC failed, we abort the rest of the loop and start over
+    }
+    Serial.println("Data is: ");   // For the printout of the data 
+    for ( i = 0; i < 32; i++) {    // Now it's time to read the PROM data itself, each page is 32 bytes so we need 32 read commands
+      data[i] = ds.read();         // we store each read byte to a different position in the data array 
+      Serial.print(data[i]);       // printout in ASCII
+      Serial.print(" ");           // blank space 
+    }
+    Serial.println();
+    delay(5000);                    // Delay so we don't saturate the serial output
+  }
+  else {                           // Nothing is connected in the bus 
+    Serial.println("Nothing connected");
+    delay(3000);
+  }
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

diff --git a/lib/OneWire/keywords.txt b/lib/OneWire/keywords.txt
new file mode 100644
index 0000000..bee5d90
--- /dev/null
+++ b/lib/OneWire/keywords.txt
@@ -0,0 +1,38 @@
+#######################################
+# Syntax Coloring Map For OneWire
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+OneWire	KEYWORD1
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+
+reset	KEYWORD2
+write_bit	KEYWORD2
+read_bit	KEYWORD2
+write	KEYWORD2
+write_bytes	KEYWORD2
+read	KEYWORD2
+read_bytes	KEYWORD2
+select	KEYWORD2
+skip	KEYWORD2
+depower	KEYWORD2
+reset_search	KEYWORD2
+search	KEYWORD2
+crc8	KEYWORD2
+crc16	KEYWORD2
+check_crc16	KEYWORD2
+
+#######################################
+# Instances (KEYWORD2)
+#######################################
+
+
+#######################################
+# Constants (LITERAL1)
+#######################################
diff --git a/plot.py b/plot.py
new file mode 100755
index 0000000..6d9d304
--- /dev/null
+++ b/plot.py
@@ -0,0 +1,126 @@
+#!/usr/bin/python3
+
+# based on https://github.com/cnvogelg/ardu/blob/master/datalog/tools/plot_log.py
+
+# This script plots a log file of the format
+# "unix_timestamp key=value key2=value key3=value ..."
+# using rrdtool. Keys are arbitrary values of the format "type:number"
+# (e.g. t:1, t:2, h:1 for temperature and humidity) used to identify each sample.
+# Note that the keys currently ignored.
+#
+# The whole log is plotted into one graph.
+
+import sys
+import subprocess
+import os
+
+if len(sys.argv) != 3:
+  print("Usage: plot.py <log> <png>", file=sys.stderr)
+  sys.exit(1)
+
+log_file = sys.argv[1]
+png_file = sys.argv[2]
+rrd_file = "tmp.rrd"
+
+#### start of config
+
+# If you change this you also need to change the create and graph lists below.
+# Also note that samples have to be in the same order every time (the key is currently ignored).
+samples_per_line=3
+
+# The 4th field of the DS lines is the heartbeat. If you sample at an
+# interval < that value you will not see a graph. Simply adjust if necessary.
+create = [
+	# Index of the 0 after --start is used below. Adjust code if you
+	# change the amount of values before it.
+	'rrdtool','create',rrd_file,'--step','30','--start',0,
+
+	'DS:temp1:GAUGE:50:U:U',
+	'DS:temp2:GAUGE:50:U:U',
+	'DS:hum1:GAUGE:50:U:U',
+
+	'RRA:AVERAGE:0.5:1:20000',
+	'RRA:MIN:0.5:1:20000',
+	'RRA:MAX:0.5:1:20000',
+]
+
+graph = [
+	# Indices of the two Nones are used below. Adjust the code if you
+	# change the amount of values before them..
+	'rrdtool','graph',png_file,
+	'-s',None,'-e',None,
+	'--height=500','--width=1000',
+	'--color=BACK#FFFFFF',
+	#'--title','Temperature',
+	'--vertical-label', 'Temperature °C',
+	'--right-axis-label', 'Humidity %',
+	'--right-axis', '2:0',
+	'--alt-autoscale',
+	#'-l','25','-u','30',
+	# --left-axis-format is only supported in rrdtool-git
+	#'--left-axis-format', '%4.2lf',
+	'--right-axis-format', '%4.2lf',
+
+	'DEF:temp1='+rrd_file+':temp1:AVERAGE',
+	'LINE1:temp1#339966:temp 1\l',
+	'DEF:temp2='+rrd_file+':temp2:AVERAGE',
+	'LINE1:temp2#663399:temp 2\l',
+	'DEF:hum1='+rrd_file+':hum1:AVERAGE',
+	'CDEF:hum11=hum1,2,/',
+	'LINE1:hum11#996633:hum 1\l',
+]
+
+#### end of config
+
+
+# load samples
+samples = []
+f = open(log_file,"r")
+for line in f:
+	elem = line.split(' ')
+	values = []
+	# timestamp
+	values.append(int(elem[0]))
+	# values
+	for i in range(1, samples_per_line + 1):
+		values.append(float(elem[i].split("=")[1]))
+	samples.append(values)
+f.close()
+
+
+# create rrd
+start_ts = samples[0][0]
+end_ts = samples[-1][0]
+create[6] = str(start_ts - 1)
+#print("creating rrdb:",create)
+ret = subprocess.call(create)
+if ret != 0:
+	#print("ERROR calling: {}".format(" ".join(create)))
+	sys.exit(1)
+
+
+# update rrd
+# TODO: multiple calls in case of too many arguments
+n = len(samples)
+cmd = ['rrdupdate', rrd_file, '--']
+for i in range(n):
+	entry = ":".join(map(str, samples[i]))
+	cmd.append(entry);
+
+ret = subprocess.call(cmd)
+if ret != 0:
+	#print("ERROR calling: {}".format(" ".join(cmd)))
+	sys.exit(1)
+
+
+# graph
+graph[4] = str(start_ts)
+graph[6] = str(end_ts)
+ret = subprocess.call(graph)
+if ret != 0:
+	#print("ERROR calling: {}".format(" ".join(graph)))
+	sys.exit(1)
+
+os.unlink(rrd_file)
+
+# vim: set noet:
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..d8122a6
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,52 @@
+#include <Arduino.h>
+#include <Wire.h>
+#include <DallasTemperature.h>
+#include <DHT.h>
+#include <stdlib.h>
+
+// Pin setup
+const int oneWirePin = 7;
+const int dhtPin = 2;
+#define DHTTYPE DHT22
+
+#define BUFSIZE 32
+
+OneWire oneWire(oneWirePin);
+DallasTemperature sensors(&oneWire);
+DHT dht(dhtPin, DHTTYPE);
+
+void setup () {
+	Serial.begin(9600);
+	dht.begin();
+}
+
+void loop () {
+	sensors.requestTemperatures();
+
+	float t1 = sensors.getTempCByIndex(0);
+
+	float t2 = dht.readTemperature();
+	float h1 = dht.readHumidity();
+
+	char temp[BUFSIZE];
+
+	// format: <timestamp|0> t:1=<temp> t:2=<temp> h:1=<humidity>
+	String line = "";
+	line += 0;
+
+	line += " t:1=";
+	dtostrf(t1, 5, 2, temp);
+	line += temp;
+
+	line += " t:2=";
+	dtostrf(t2, 5, 2, temp);
+	line += temp;
+
+	line += " h:1=";
+	dtostrf(h1, 5, 2, temp);
+	line += temp;
+
+
+	Serial.println(line);
+	delay(10000);
+}