I built two remotely controlled flashlight for a Halloween game.
For that I added a micro-controller in flashlights, which would receive the signal from an IR remote, and switch on/off the light (with a flickering fading pattern).
the circuit is really simple:
For the micro-controller I used an Atmel ATtiny85V. This can directly work with 2xAA batteries (2.0-3.0V) and 3xAAA (3.0-4.5V). Thanks to its small size it can be installed inside the flashlight.
this was more a proof of concept. it used an old incandescent-bulb-based flashlight. since the case is transparent, the IR receiver can also be placed inside.
this uses a more robust flashlight in an aluminium case. the LED in the center has been replaced by the IR receiver.
two firmware versions have been writte:
to remotely control the flash light, I used a Nikon remote control. it was originally intended to trigger the shutter of some Nikon camera. but I re-used it because the form factor and single large button fitted my use case.
here are sigrok traces of the IR signal transmitted by the remote.