Posts Tagged ‘photo resistor’

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Eat Sign

August 10, 2013

EatRecently while on vacation I picked up two plastic letters and one metal one spelling EAT.

I am starting to make a sign for my kitchen using 2 TLC5940 chips and roughly 15 – 30 leds.  The exact number of leds I need is still to be determined. How to wire up the TLC5940 can be found here.

The letters will be slightly raised off the backing panel, allowing light from the leds to show.  I will be drilling holes through the backing panel and inserting the leds from behind.

The general idea is to use a photo resistor so the sign automatically comes on when dark enough.

I will also have a push button on the side so you can toggle through different modes.  Right now I have 3 modes.  Normal mode turns on one LED at at a time until all are lit up.  Blink mode blinks all the lights. Fade mode fades the leds up, down and up again, finally leaving them on at full brightness.

Check out the short video for the set up and the 3 modes.  In the video I am covering the photo resistor to get the lights to go on and then pushing the button to toggle through the modes.

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