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I missed the youtube video the first time around: https://www.youtube.com/watch?v=4QgeQAiSmM8 It's hilarious how while it's writing it looks like two small arms cupping the marker. Slap on a smiley-face sticker and you're ready to go to market.
I was thinking the same thing. I envisioned a Muppet head and arms would do the trick.
I'm fascinated by this project, but I also find it kind of unsettling. I think the "arms" make it fall into the Uncanny Valley for me.
I missed the youtube video the first time around: https://www.youtube.com/watch?v=4QgeQAiSmM8 It's hilarious how while it's writing it looks like two small arms cupping the marker. Slap on a smiley-face sticker and you're ready to go to market.
It would be fun to see it write in your own handwriting. Also, I was thinking something like this [0]! :) [0]: https://wessonblog.files.wordpress.com/2011/05/hitchhikers.j...
Earlier quoted context omitted.
You would need to control a pair of servos. Arduino is the easy way. Some trigonometry to convert x-y positions to the two arm angles. The connectors to the pen are linkages. I am currently building a whiteboard plotter myself, though a much larger scale. Feel free to send me questions and I can send you pointers on where to research next.
There are three parts to learn -- the electronics (handled by an Arduino and a few servos), the mechanics (for this design, it's not too complicated -- you could make do with popsicle sticks and some screws if you had to), and the software. The tricky bit with the software is the math. The arms, when free to spin around their centers, can be considered circles. You'd want to learn the geometry of circles and, specifi…