ATtiny85 & LIR-2032-based TV-B-Gone!
If you have a pile of surface-mount components laying around you could take a stab and building this teeny tiny Micro TV-B-Gone, that isn’t much wider than a 2032 battery (the 20 in 2032 tells you the battery is 20mm wide, so emphasis on ‘micro’ in Micro TV-B-Gone!):
The Micro TV-B-Gone is based off of Adafruit’s original TV-B-Gone kit, except made to be as small as possible, using an LIR-2032 coin cell.
I based this project off of the Adafruit TV-B-Gone kit. I wanted to start getting into using surface mount components on my projects, and seeing as the TV-B-Gone was my first foray into soldering, I figured that it would be a great project to work on.
The device takes a rechargeable LIR-2032 battery, and is activated pressing the single button on top. It will run through all TV power codes, and then go into a low power mode, waiting for the next button press. The battery will last around 40 full cycles, before being reduced down to 3.5 volts.
Additional Reading:
Watch Mitch Altman talk about the history of the TV-B-Gone in this talk ‘History of the Maker Movement’ Panel Presentation | @hopeconf @maltman23 @SherryHuss