This emulate ML-L3 for Nikon Cameras on M5StickC.
Point at the IR receiver of the Camera and click Button A. Button A is the biggest button on M5StickC.
M5StickC has battery, so it works exactly like ML-L3.
If you change the IR transmission pattern, you should be able to use it for other cameras, but I could not have this implementations because I do not have it. If implemented, please cleate PR for this repository.