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The step-by-step tutorial and STL files can be found here:
https://www.electromaker.io/project/view/arduino-based-coin-sorting-and-counting-machine
(THE STL FILES ARE AT THE BOTTOM OF THE PROJECT PAGE!)
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https://www.electromaker.io/kits
This Arduino-powered machine separates coins of different dominations and then tallies up their total value. This is shown on an 8 digit 7 segment display. Reflected infrared sensors (TCRT5000s) are used to detect the coins.