Here is a drawing machine from Neil Mendoza that is powered by a hamster. It has drawing arms milled from aluminum and lets your hamster create a work of art. The developer used a Raspberry Pi, hidden behind the screen, to run the software responsible for sending ASCII commands to an Applied Motion STM23IP-3EE stepper motor over Ethernet.
More gadgets like this: here
More information is available on neilmendoza.com.
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