a MIDI sync module for the Boss DR110 Drum machine.
built for the digispark attiny85 usb dev board, but should work on most arduinos
depends on: dr110 https://github.com/digistump/DigistumpArduino
https://github.com/FortySevenEffects/arduino_midi_library
inspired by a variety of din sync mods by cool people on the internet. https://www.circuitbenders.co.uk/tutorials/DR110dinsyncguide.pdf