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Showing posts from November, 2018

Halloween LED lights on a plastic trick or treat cauldron

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Halloween has past but it wasn’t uneventful. My two year old daughter went trick or treating for the first time and it was all so exciting! When i saw the plastic cauldron she was carrying as a trick or treat bag i had an idea. I could use an arduino to operate red LEDs and make the cauldron flash on and off like little evil eyes. I knew she would love it! Once I drilled the holes and got all the pieces I needed: 2 red LEDs soldered in series with a resistor. I connected those to a breadboard arduino I had spare. (See my blog post on making a breadboard arduino.) You can just use a normal Arduino UNO here instead if you prefer. My reasons are because they're cheaper, and also because a breadboard Arduino uses less power and I wanted this to be battery powered. I'm powering the whole thing with 3 AA batteries in a battery case. Because Maplin has shut down in the UK :((( I will have to wait for the battery holder to be delivered... no more weekend fun popping down t