![]() 3D print two gears to go on the EAS knobs. stl file for these and all other 3D printed parts can be found in the github repository.Ĥ. You can 3D print these as I did (the small black pieces in the photo) or just use metal brackets or even spare pieces of wood. With that piece in place, attach two tabs to either end to keep the EAS from moving side to side. If you go with wood, you will need to increase the height of your plywood to allow room for this top piece.ģ. I used 3D printed pieces for this, but using wood is another option. But, you could put another piece of wood along the top of the EAS to keep the EAS secure at the top. ![]() Attach this centered at the bottom of the plywood so that the EAS can rest against it while the top of the EAS is flush with the top of the plywood. This piece is 9" wide, 1.5" tall, and 5/8" thick (ignore the notch in the bottom you can see in the picture - this was already in the piece of scrap wood that I used). Both to hold the motors and to support the EAS, cut a piece of scrap wood to match the length of the EAS. But, keep reading before you cut yours - you may need to make it a little taller depending on a choice you make below.Ģ. Mine is approximately 11.25" wide by 9" high. Cut a piece of plywood for the EAS to sit on. In this step, you'll build a plywood backer board for the EAS to rest on with two stepper motors attached to control the EAS.ġ. set up the Raspberry Pi Zero W with all of the code it needs and.build a stand to hold the Etch-A-Sketch and allow it to erase itself (optional).attach the stepper motors to the Etch-A-Sketch so the motors can control the knobs of the Etch-A-Sketch.Overall, the build can be separated into the following tasks: I have included design files that you can download for the parts as well as the code needed to run it on github here. You will, however, need access to a 3D printer and/or laser cutter to create the gears (unless, of course, you can come up with some other creative solution). From there, I decided to make it replicate more complex rotary harmonograph figures and, finally, draw images.īuilding your own is fairly straight forward. Then, after building a harmonograph table (similar to this one), I noticed the Etch-A-Sketch lying around and thought "I could put motors on the Etch-A-Sketch and make it draw two pendulum harmonograph figures." After much trial and error, it actually worked fairly well. It's just too hard to draw anything that isn't made out of only rectangles! So, my son's Etch-A-Sketch languished unused around the house for several years. If you're like me, you've tried to make a drawing on an Etch-A-Sketch before with very limited success.
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