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.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.