Three digit electromechanical Counter / Register
thingiverse
Construct a 3-digit electromechanical register by printing three digit wheels, two 8-tooth gears, and one drive gear. Attach these parts to 5/32 brass rods and embed three rare-earth magnets in the wheels. Mount three reed switches on a holder and wire them in series. Finally, glue the drive gear onto the stepper motor shaft for operation. The reed switches will close when all digits read '0', detecting the rollover condition. Share your feedback or suggestions for improvement!
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