initial commit

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

7 files changed, 696 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/COPYING b/COPYING
new file mode 100644
index 0000000..d159169
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
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+associated interface definition files, plus the scripts used to
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+form) with the major components (compiler, kernel, and so on) of the
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+If distribution of executable or object code is made by offering
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+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/daemon.py b/daemon.py
new file mode 100755
index 0000000..a66c8c5
--- /dev/null
+++ b/daemon.py
@@ -0,0 +1,130 @@
+#!/usr/bin/python
+
+import serial
+import mpd
+import time
+import sys
+
+class Config:
+    display_lines = 2
+    display_width = 16
+    display_length = display_lines * display_width
+
+class Daemon:
+    line = ""
+    playing = False
+
+    def __init__(self):
+        self.ser = serial.Serial(sys.argv[1], 9600, timeout=1)
+
+        # raise timeout to let arduino start up
+        self.ser.timeout = 15
+        incoming = self.readline()
+
+        # arduino sometimes has a dirty buffer
+        # and sends junk before the ready message
+        if not incoming.endswith("ready"):
+            sys.stderr.write("Got unexpected reply: "+incoming)
+            raise Exception("Wrong client greeting")
+        self.ser.timeout = 1
+
+        self.client = mpd.MPDClient()
+        self.client.connect("localhost", 6600)
+
+    def readline(self):
+        return self.ser.readline().decode("ascii").strip()
+
+    def update(self):
+        old_line = self.line
+        old_playing = self.playing
+        changed = False
+
+        incoming = self.client.currentsong()
+
+        self.line = incoming["artist"] + " - " + incoming["title"]
+        if self.line != old_line:
+            changed = True
+
+        self.playing = self.client.status()["state"] == "play"
+        if self.playing != old_playing:
+            changed = True
+
+        return changed
+
+    def run(self):
+        self.update()
+
+        last_display_update = 0.0
+        last_song_update = 0.0
+        now = 0.0
+        time_diff = 0.0
+        current_position = 0
+
+        while 1:
+            now = time.time()
+
+            # check for incoming commands from arduino
+            if self.ser.inWaiting() > 0:
+                incoming = self.readline()
+
+                functions = {
+                    "next": self.client.next,
+                    "previous": self.client.previous,
+                    "pause": self.client.pause,
+                }
+                try:
+                    func = functions[incoming]
+                    func()
+
+                    # force redraw if anything changed
+                    if self.update():
+                        last_display_update = 0
+                        current_position = 0
+
+                except KeyError:
+                    pass
+
+            # check if song changed
+            # TODO: use idle and poll (more often)?
+            time_diff = now - last_song_update
+            if time_diff > 2.5 or time_diff < -60.0:
+                last_song_update = now
+                if self.update():
+                    last_display_update = 0
+                    current_position = 0
+
+            # update arduino display
+            time_diff = now - last_display_update
+            if time_diff > 0.8 or time_diff < -60.0:
+                last_display_update = now
+                if self.playing:
+                    i = current_position
+
+                    if i - 1 + Config.display_length == len(self.line):
+                        i = 0
+
+                    if i == 0:
+                        # allow people to start reading
+                        last_display_update += 2
+
+                    if len(self.line) > Config.display_length:
+                        buf = self.line[i:i+Config.display_length]
+                    else:
+                        buf = self.line.ljust(Config.display_length, " ")
+
+                    i += 1
+                    current_position = i
+                else:
+                    buf = "-- PAUSED --".center(Config.display_width, " ").ljust(Config.display_length, " ")
+
+                    # always start at the beginning if we unpause
+                    current_position = 0
+
+                print("'" + buf + "'")
+                self.ser.write(bytes(buf, "ascii", "replace"))
+
+            time.sleep(0.05)
+
+if __name__ == '__main__':
+    d = Daemon()
+    d.run()
diff --git a/lib/.holder b/lib/.holder
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/lib/.holder
diff --git a/src/Bounce.cpp b/src/Bounce.cpp
new file mode 100644
index 0000000..40709e4
--- /dev/null
+++ b/src/Bounce.cpp
@@ -0,0 +1,90 @@
+

+// Please read Bounce.h for information about the liscence and authors

+

+#include <Arduino.h>

+#include "Bounce.h"

+

+Bounce::Bounce() {

+}

+

+Bounce::Bounce(uint8_t pin,unsigned long interval_millis)

+{

+	interval(interval_millis);

+	previous_millis = millis();

+	state = digitalRead(pin);

+    this->pin = pin;

+}

+

+

+void Bounce::write(int new_state)

+       {

+       	this->state = new_state;

+       	digitalWrite(pin,state);

+       }

+

+

+void Bounce::interval(unsigned long interval_millis)

+{

+  this->interval_millis = interval_millis;

+  this->rebounce_millis = 0;

+}

+

+void Bounce::rebounce(unsigned long interval)

+{

+	 this->rebounce_millis = interval;

+}

+

+

+

+int Bounce::update()

+{

+	if ( debounce() ) {

+        rebounce(0);

+        return stateChanged = 1;

+    }

+

+     // We need to rebounce, so simulate a state change

+     

+	if ( rebounce_millis && (millis() - previous_millis >= rebounce_millis) ) {

+        previous_millis = millis();

+		 rebounce(0);

+		 return stateChanged = 1;

+	}

+

+	return stateChanged = 0;

+}

+

+

+unsigned long Bounce::duration()

+{

+  return millis() - previous_millis;

+}

+

+

+int Bounce::read()

+{

+	return (int)state;

+}

+

+

+// Protected: debounces the pin

+int Bounce::debounce() {

+	

+	uint8_t newState = digitalRead(pin);

+	if (state != newState ) {

+  		if (millis() - previous_millis >= interval_millis) {

+  			previous_millis = millis();

+  			state = newState;

+  			return 1;

+	}

+  }

+  

+  return 0;

+	

+}

+

+// The risingEdge method is true for one scan after the de-bounced input goes from off-to-on.

+bool  Bounce::risingEdge() { return stateChanged && state; }

+// The fallingEdge  method it true for one scan after the de-bounced input goes from on-to-off. 

+bool  Bounce::fallingEdge() { return stateChanged && !state; }

+

diff --git a/src/Bounce.h b/src/Bounce.h
new file mode 100644
index 0000000..68cdbd8
--- /dev/null
+++ b/src/Bounce.h
@@ -0,0 +1,71 @@
+
+/*
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *      
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *      
+ *      You should have received a copy of the GNU General Public License
+ *      along with this program; if not, write to the Free Software
+ *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *      MA 02110-1301, USA.
+ */
+
+
+
+/*  * * * * * * * * * * * * * * * * * * * * * * * * * * * 
+ Main code by Thomas O Fredericks
+ Rebounce and duration functions contributed by Eric Lowry
+ Write function contributed by Jim Schimpf
+ risingEdge and fallingEdge contributed by Tom Harkaway
+* * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef Bounce_h
+#define Bounce_h
+
+#include <inttypes.h>
+
+class Bounce
+{
+
+public:
+	// Initialize
+  Bounce(); 
+  Bounce(uint8_t pin, unsigned long interval_millis ); 
+	// Sets the debounce interval
+  void interval(unsigned long interval_millis); 
+	// Updates the pin
+	// Returns 1 if the state changed
+	// Returns 0 if the state did not change
+  int update(); 
+	// Forces the pin to signal a change (through update()) in X milliseconds 
+	// even if the state does not actually change
+	// Example: press and hold a button and have it repeat every X milliseconds
+  void rebounce(unsigned long interval); 
+	// Returns the updated pin state
+  int read();
+	// Sets the stored pin state
+  void write(int new_state);
+    // Returns the number of milliseconds the pin has been in the current state
+  unsigned long duration();
+  // The risingEdge method is true for one scan after the de-bounced input goes from off-to-on.
+	bool risingEdge();
+  // The fallingEdge  method it true for one scan after the de-bounced input goes from on-to-off. 
+	bool fallingEdge();
+  
+protected:
+  int debounce();
+  unsigned long  previous_millis, interval_millis, rebounce_millis;
+  uint8_t state;
+  uint8_t pin;
+  uint8_t stateChanged;
+};
+
+#endif
+
+
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..30f2b87
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,65 @@
+#include <Arduino.h>
+#include <LiquidCrystal.h>
+#include "Bounce.h"
+
+void setup();
+void loop();
+
+#define BUFFER_SIZE 64
+char buf[BUFFER_SIZE];
+
+// initialize the library with the numbers of the interface pins
+LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
+
+// A0 = prev; A1 = pause; A2 = next
+byte buttons[] = {A0, A1, A2};
+#define NUMBUTTONS sizeof(buttons)
+#define DEBOUNCE 10
+Bounce bounce_buttons[NUMBUTTONS];
+
+void setup() {
+	byte i;
+	lcd.begin(16, 2);
+	Serial.begin(9600);
+	Serial.setTimeout(5000);
+
+	for (i = 0; i < NUMBUTTONS; i++) {
+		pinMode(buttons[i], INPUT);
+		digitalWrite(buttons[i], HIGH);
+		bounce_buttons[i] = Bounce(buttons[i], DEBOUNCE);
+	}
+
+	Serial.println("ready");
+}
+
+bool button_just_pressed(int i) {
+	bounce_buttons[i].update();
+	return bounce_buttons[i].fallingEdge();
+}
+
+void loop() {
+	if (button_just_pressed(0)) {
+		Serial.println("previous");
+	}
+
+	if (button_just_pressed(1)) {
+		Serial.println("pause");
+	}
+
+	if (button_just_pressed(2)) {
+		Serial.println("next");
+	}
+
+	// output what we got over serial
+	if (Serial.available() >= 32) {
+		lcd.setCursor(0, 0);
+		Serial.readBytes(buf, 32);
+		for (int i = 0; i < 32; i++) {
+			if (i == 16) {
+				lcd.setCursor(0, 1);
+			}
+			lcd.write(buf[i]);
+		}
+	}
+}
+