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paper_bits:pb702_midi_synth [2020/03/20 16:35]
admin [Parts]
paper_bits:pb702_midi_synth [2020/06/11 22:13] (current)
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 ===== PB702 MIDI Synthesizer ===== ===== PB702 MIDI Synthesizer =====
  
-The MIDI Synthesizer gives the possibility to connect your Paper Bits to a Midi Keyboard like the[[sound_boards:midi_keyboard|MIDI Keyboard]]. It is polyphonic up to six notes and has three different waveformssquare, triangle and sine.\\ +{{:paper_bits:pb702_midi_synth.jpg?600|}}\\
-It's basically an Arduino clone running a small program based on the wonderful [[http://​sensorium.github.io/​Mozzi/​|Mozzi]] library.\\+
  
-For burning ​the bootloader look here:\\ +The MIDI Synthesizer gives the possibility to connect your Paper Bits to any Midi Keyboard, such as the [[sound_boards:midi_keyboard|MIDI Keyboard]]. It is polyphonic up to six notes and has four different waveforms: square, triangle, saw tooth and sine.\\ 
-[[avr_bootloader:avr_bootloader_main|AVR & Bootloader]]\\ +It's basically ​an Arduino ​clone running a small program based on the wonderful ​[[http://​sensorium.github.io/​Mozzi/​|Mozzi]] library.\\
-For uploading the program one needs an USB to Serial adapter or an Arduino:\\ +
-[[arduino_clones:serial_adapter|The Arduino as a Serial Adapter]]\\+
  
 ---- ----
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 ---- ----
 ==== Software ==== ==== Software ====
 +
 +First of all one needs a bootloader on the Atmega chip. For burning the bootloader follow the [[avr_bootloader:​avr_bootloader_main|AVR & Bootloader]] manual.\\
 +For uploading the program one needs an USB to Serial adapter or an Arduino to mimic one: [[arduino_clones:​serial_adapter|The Arduino as a Serial Adapter]]\\
 +
 +
 +=== Mozzi and MIDI ===
 +The synthesizer program is based on the MIDI library and the [[https://​sensorium.github.io/​Mozzi/​|Mozzi Library]], have a look at the [[https://​sensorium.github.io/​Mozzi/​doc/​html/​index.html|Mozzi Dokumentation]] to learn more about it.\\
 +The MIDI library can be installed via the library manager, for the Mozzi installation download the [[https://​sensorium.github.io/​Mozzi/​download/​|Mozzi library]] and install it like described here: [[https://​www.arduino.cc/​en/​Guide/​Libraries#​toc4]]\\
 +
 +=== Mozzi Mode ===
 +There are three different sound quality modes for the Mozzi library. The MIDI Synth needs the HIFI mode. To change that open in .../​sketchbook/​libraries/​Mozzi_102 the mozzi_config.h file and comment out the AUDIO_MODE STANDARD and uncomment the AUDIO_MODE HIFI. It should look like that:\\
 +
 +   //#​define AUDIO_MODE STANDARD
 +   //#​define AUDIO_MODE STANDARD_PLUS
 +   #​define AUDIO_MODE HIFI
 +then save the file.
 +
 +=== Mozzi Glitch ===
 +Unfortunately the latest version of Arduino is responsible for a timing glitch in the Mozzi library. Arduino changed the compiler from O2 to Os. Now the uploaded code is smaller but a timing problem appears, too. Here is an description about the problem here:
 +[[https://​www.instructables.com/​id/​Arduino-IDE-16x-compiler-optimisations-faster-code/​]]\\
 +
 +To fix the glitch one has to downgrade the compiler. Change in: arduino-x.x.x\hardware\arduino\avr\platform.txt the compiler from **-Os** into **-O2.**\\ ​
 +[[https://​sensorium.github.io/​Mozzi/​fixes/​updates/​howto-for-arduino-1-dot-6-11/​]]\\
 +
 +=== Code ===
 +Upload that code to your board (Arduino UNO):\\
 {{ :​paper_bits:​mozzi_midi_poli_12_1sec_limit.zip |}}\\ {{ :​paper_bits:​mozzi_midi_poli_12_1sec_limit.zip |}}\\
 +{{ :​paper_bits:​mozzi_midi_poli_10.7z |}}\\
  
 ---- ----
 +==== License ====
 +The PB702 MIDI Synthesizer was designed by **Wolfgang Spahn**, 2017-20.\\
 +It is licensed under a [[http://​creativecommons.org/​licenses/​by-nc-sa/​4.0/"​|Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License]].
 +
 +<​html>​
 +<a rel="​license"​ href="​http://​creativecommons.org/​licenses/​by-nc-sa/​4.0/"><​img alt="​Creative Commons License"​ style="​border-width:​0"​ src="​https://​i.creativecommons.org/​l/​by-nc-sa/​4.0/​88x31.png"​ /></​a> ​
 +</​html>​
 +
 +----
 +