DrumFiend is a trigger-to-MIDI processor. Send it triggers, and it’ll send out MIDI notes to a connected drum machine.

With the default firmware, DrumFiend is set up with a drum map for the DrumBrute Impact with each trigger input corresponding to a drum. Inputs on the left and right hand side are the normal and “colour” versions of the various drums, with trigger input 19 reserved for the cowbell.

DrumFiend’s inputs trigger at levels above 2.5v and may be run all the way up to low audio rates.

As DrumFiend runs CircuitPython, changing the drum map to output different MIDI notes is as easy as plugging it in to your computer. You can even completely change the module’s function if you want to!

DrumFiend supports both MIDI-A and MIDI-B TRS-MIDI variants, switchable with jumpers on the back of the module.

For DIY kits, all SMD parts are pre-soldered!

Note: In addition to the module, you will also need a TRS to MIDI cable to use this with other (non-TRS) MIDI gear.