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paper_bits:pb702_midi_synth [2017/09/12 22:16] admin [Paper PCB] |
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 possiblility to connect your Paper Bits to your Keyboard. It is polyphonic up to six notes and has three different waveforms: square, 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. | + | |
| + | 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.\\ | ||
| + | It's basically an Arduino clone running a small program based on the wonderful [[http://sensorium.github.io/Mozzi/|Mozzi]] library.\\ | ||
| ---- | ---- | ||
| Line 12: | Line 14: | ||
| ==== Parts ==== | ==== Parts ==== | ||
| * **Resistors:** | * **Resistors:** | ||
| + | * 1x 220 Ohm | ||
| * 1x 330 Ohm | * 1x 330 Ohm | ||
| + | * 2x 470 Ohm | ||
| + | * 2x 1 KOhm | ||
| + | * 2x 1.2 KOhm | ||
| + | * 1x 2 KOhm | ||
| + | * 1x 3.3 KOhm | ||
| + | * 1x 3.9 KOhm | ||
| + | * 2x 8.2 KOhm | ||
| + | * 1x 10 KOhm | ||
| + | * 2x 47 KOhm | ||
| + | * 1x 100 KOhm | ||
| + | * 1x 220 KOhm | ||
| + | * 1x 1 MOhm | ||
| * **Capacitors:** | * **Capacitors:** | ||
| - | + | * 2x 22 pF | |
| - | * 5x 100 nF (foil) | + | * 2x 1 nF |
| + | * 1x 4.7 nF | ||
| + | * 3x 100 nF | ||
| + | * 1x 150 nF | ||
| * **Electrolytic Capacitors:** | * **Electrolytic Capacitors:** | ||
| - | * 1x 4,7 µF | + | * 1x 1 µF |
| - | * 1x 10 µF | + | * 2x 10 µF |
| - | * 1x 47 µF | + | |
| * **Semiconductors**: | * **Semiconductors**: | ||
| - | + | * Atmega 328P-PU | |
| - | * optocoupler | + | * OpAmp MCP 6002 |
| + | * Optocoupler 6N138 | ||
| + | * **Cristal** | ||
| + | * 1x 16 MHz | ||
| + | * **Diodes** | ||
| + | * 1x 1N4148 | ||
| * 1x LED | * 1x LED | ||
| * **Mechanical:** | * **Mechanical:** | ||
| - | * 1x IC socket, 16 pin | + | * 1x IC socket, 28 pin |
| - | * 1x IC socket, 4 pin | + | * 2x IC socket, 8 pin |
| - | * 1x pin strip 1x9 | + | * 1x pin strip 1x14pin |
| * 2x pin header, female 90° 1x3, 1x2 | * 2x pin header, female 90° 1x3, 1x2 | ||
| * 2x pin header, male 90° 1x3, 1x2 | * 2x pin header, male 90° 1x3, 1x2 | ||
| - | * 3x mini switch | + | * 2x push button |
| - | * 3x push button | + | |
| * 3x jumpers | * 3x jumpers | ||
| - | * **Potentiometers:** | ||
| - | * 1x 10k | ||
| ---- | ---- | ||
| - | ~~socialite:icon facebook twitter googleplus reddit tumblr~~ | + | ==== 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 |}}\\ | ||
| ---- | ---- | ||
| + | ==== 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> | ||
| + | |||
| + | ---- | ||
| + | |||