How to Build an LED Etch A Sketch With a Motion Sensor That Lets You Shake to Erase

The Etch a Sketch toy has gone more or less unchanged for over 60 years, but if you’re handy with a soldering iron you can build an upgraded version that swaps aluminum powder for glowing LEDs. You’re still stuck with the challenge of drawing using just two spinning knobs, but when you screw up, a motion sensor lets…

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