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paper_bits:pb702_midi_synth [2020/03/20 17:51]
admin [Software]
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 ====
  
-The synthesizer program is based on 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.\\ +First of all one needs a bootloader ​on the Atmega chipFor burning the bootloader follow ​the [[avr_bootloader:avr_bootloader_main|AVR & Bootloader]] manual.\\ 
-For the installation download the [[https://​sensorium.github.io/​Mozzi/​download/​|library]]\\ +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]]\\
-and install it like described here: [[https://​www.arduino.cc/​en/​Guide/​Libraries#​toc4]]\\+
  
-Unfortunately ​there is nowadays ​a glitch in the Mozzi library. Arduino ​change ​the compiler. Now the uploaded code is smaller but a timing problem ​appeared, too. Here is an description about the problem.+ 
 +=== 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 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/​]]\\ [[https://​www.instructables.com/​id/​Arduino-IDE-16x-compiler-optimisations-faster-code/​]]\\
  
-To fix the glitch ​follow these steps:\\ +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.**\\ 
-In: arduino-x.x.x\hardware\arduino\avr\platform.txt ​change ​**-O2** to **-Os.**\\ +
 [[https://​sensorium.github.io/​Mozzi/​fixes/​updates/​howto-for-arduino-1-dot-6-11/​]]\\ [[https://​sensorium.github.io/​Mozzi/​fixes/​updates/​howto-for-arduino-1-dot-6-11/​]]\\
-\\ 
  
 +=== Code ===
 Upload that code to your board (Arduino UNO):\\ 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 |}}\\
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 +==== 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>​
 +
 +----
 +