This project is a realization of a coin sorter. It uses lasers and photoresistors : the coin cuts the beam and increments the 7 segments displays while pressing a button decrements these displays.
You will find here the main code of this project but also simulation and 2D plans.
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Library requirement : My Simple I/O Library (docs)
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Component list for 3 columns :
Component Count 7 segment display (common anode) 6 Button 3 BCD (4511) 3 Resistor ~470 ohms 21 (7*3) Arduino MEGA (or Arduino with enough pins) 1 Photosensor 3 Resistor ~1kohm 3 Laser 3