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paper_bits:pb702_midi_synth [2017/09/14 00:40]
admin [PB702 MIDI Synthesizer]
paper_bits:pb702_midi_synth [2020/03/21 13:18] (current)
admin [License]
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 ===== PB702 MIDI Synthesizer ===== ===== PB702 MIDI Synthesizer =====
  
-The MIDI Synthesizer gives the possiblility to connect your Paper Bits to your 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 basicaly an Arduino klone running a small program based on the wonderfull [[http://sensorium.github.io/​Mozzi/​|Mozzi]] librarie.\\+
  
-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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   * 1x 3.3 KOhm   * 1x 3.3 KOhm
   * 1x 3.9 KOhm   * 1x 3.9 KOhm
-  * 1x 8.2 KOhm+  * 2x 8.2 KOhm
   * 1x 10 KOhm   * 1x 10 KOhm
-  * 1x 47 KOhm+  * 2x 47 KOhm
   * 1x 100 KOhm   * 1x 100 KOhm
   * 1x 220 KOhm   * 1x 220 KOhm
Line 34: Line 31:
   * 2x 22 pF   * 2x 22 pF
   * 2x 1 nF   * 2x 1 nF
 +  * 1x 4.7 nF
   * 3x 100 nF   * 3x 100 nF
   * 1x 150 nF   * 1x 150 nF
Line 59: Line 57:
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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_10.7z |}}\\ {{ :​paper_bits:​mozzi_midi_poli_10.7z |}}\\
 +
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-~~socialite:icon facebook twitter googleplus reddit tumblr~~+==== 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>​
  
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 +