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!
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.