Create an electrical switch and control it over a phone with components that can be salvaged from old electronics.
The app :
https://apkpure.com/remote-controlled-flashlight/sonap.remoteflashlight

, https://i.ytimg.com/vi/h9OU8tE2nOI/hqdefault.jpg

source

2 Comments

  2. "Without a microcontroller", you only need two quad-core phones processors :S

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