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Laser Doodler Draws on a LED Matrix

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So when this display arrived in the mail, I wanted something to do with it so I could get accustomed to the pinout and LED intensity. I thought it would be fun to create a simple display that can be “drawn on” with a light source. An LED would work, but using a laser allows you to doodle from across the room if your hand is steady enough.

In order to accomplish this, the display needed to alternate between being a display and being a sensor. During its sensor stage, it records where the laser dot is located, and during its display stage, it lights up the LED associated with the laser dot’s position.

[via Embedded Projects]

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My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal nerdage.net

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