a python script for interpreting MIDI files for output from a Raspberry Pi to the solenoid controllers for an air-horn organ
the master branch uses relative time in the scroll, and therefore times output using time since last update
The 8 control boards are each comprised of one SN74HC595N and one ULN2803APG, and each board can output to 8 solenoids. The current iteration is scripted with a built-in range of 64 chromatic notes starting at MIDI pitch 24. The PCB design can be found here. This project requires py-spidev and python-midi.
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