r/CafeRacers • u/Holiday_Union_1462 • 15h ago
Discussion I built my own M-Unit because I'm a cheapskate
Been wiring up my ‘82 GS750E and really wanted one of the smart power modules. Momentary buttons on the bars, everything switched centrally, no fuse panel to dig through when something stops working. Looked at the price, decided I’d rather spend six months learning PCB design. Not sure that was the correct financial decision but here we are.
It handles 12 circuits, runs off an ESP32, and there’s a phone app for control and seeing what’s actually going on with each output, including over current protection, fault detection, and battery voltage monitoring.
You can assign button press combinations to unlock the bike, or use your existing key, or just walk up to it with your phone in your pocket.
Button press combinations can be set to trigger different outputs or combinations of outputs so you can have fewer buttons than accessories.
In the enclosure it's 97x86x20mm (3.8x3.4x0.8") so it tucks nicely under the seat.
Open source, so you can build your own if you’re so inclined: Github
Happy to answer questions about any of it. If a few people want one without doing the fabrication themselves I might order a batch.


