To program the validator: power with 12VDC (power wire goes to +12VDC, ground wire to common ground). Press and hold the little button on top for 5 seconds and release. The LED will be on. Now insert 30 sample coins of the value you want to detect (say 30 quarters or 30 Euro coins). Once the LED goes out it's programmed! Connect a 10K (1K to 100K is fine) pullup resistor from the COIN wire to your microcontroller's VCC line (for Arduino, this is a +5V). Insert a coin, and verify that the LED line pulses high for about 40 milliseconds.
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