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+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).
+====== flashlights ======
+the circuit is really simple:
+  * Unordered List Iteman infra-red demodulator (38 kHz, to be compatible with most remotes)
+  * a transistor to power the light (nMOS)
+  * a micro-controller to decode the IR command and switch the lights.
+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.
+===== 1st prototype =====
+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.
+{{:remote_flashlight:prototype-1.jpg?0x250|}}
+{{:remote_flashlight:circuit-1.jpg?0x250|}}
+===== 2nd prototype =====
+this uses a more robust flashlight in an aluminium case.
+the LED in the center has been replaced by the IR receiver.
+{{:remote_flashlight:prototype-2.jpg?0x250|}}
+{{:remote_flashlight:circuit-2.jpg?0x250|}}
+{{:remote_flashlight:receiver-2.jpg?0x250|}}
+===== firmware =====
+two firmware versions have been writte:
+  * the {{ :remote_flashlight:firmware_nec.tar.bz2 |first}} to receive commands from more common remote controls using the IR NEC protocol
+  * the {{ :remote_flashlight:firmware_nikon.tar.bz2 |second}} to receive commands from the more task appropriate Nikon shutter remote
+====== remote ======
+===== Nikon =====
+{{:remote_flashlight:overview.jpg?0x250|}}
+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.
+{{ :remote_flashlight:ir-nikon_trace.zip | here are sigrok traces}} of the IR signal transmitted by the remote.
+===== TV-B-Gone kit =====
+to be sure the operator could remotely control the flashlight in all circunstances, I also provided a [[https://learn.adafruit.com/tv-b-gone-kit|TV-B-Gone (Kit)]] {{ :remote_flashlight:firmware_tvbgone-nikon.tar.bz2 |re-programmed}} to only send the Nikon code (at very high power).