Tiny moon lights

Small and cheap LED lights that turn on when its dark. Powered by a coin cell battery.

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A tiny board that you can tape to any object and that gives you a nice faint cool white light when it gets dark, trying to resemble moonshine.
It runs for a few weeks on a CR2032 battery.

You can adjust the brightness threshold for when to turn the lights on with a potentiometer. The voltage comparison is made with a small low power op-amp.

I got the idea to do this project from turning off my kitchen lights which are LED based and have this nice effect of tinting the whole room in a faint white light that looks like the moon is shining "brightly" into the room for a second, so I wanted to re-create that effect with low power LEDs.

I put a bit of thermo plastic around the LEDs to increase the diffusion of the light.
The light dependent resistor should face away from the LED as much as possible.

Enjoy this project?



Arya wrote 07/22/2019 at 00:13 point

got a schematic?

  Are you sure? yes | no

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