Archive for May, 2013

LED Etch-a-Sketch built without a microcontroller

Posted: May 23, 2013 by getreelfishingpro in Events

A but complex but truly amazing!



This project is a wonderful example of what can be accomplished with a rather complicated logic circuit. It’s an Etch-a-Sketch made from a 16×16 LED grid. That in itself is only somewhat interesting. But when hearing about the features and that it is driven by logic chips we were unable to dream up how it was designed. There’s no schematic but the video commentary explains all.

The thing that confused us the most is that the cursor is shining brighter than the rest of the pixels. This is done with two different 555 times and a duty cycle trick. When you turn the trimpots the cursor position is tracked by some decade counters. Pixels in your path are written to a RAM chip which acts as the frame buffer. And there’s even a level conversion hack that let’s the display run at 15v to achieve the desired brightness. Top…

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Fire piston

Posted: May 2, 2013 by fink000 in Events
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Hey guys the other day one of the members who are working on the Redbull project was talking about a Fire piston. I had never heard of this, so I decided to do some research. I found a video of one that is made of acrylic and really easy to make. I go camping alot and a way to start a fire without matches or lighter is something that would come in handy.