I want to learn how to program/code Arduino UNO with bill acceptors all by myself. Any recommendations where to start? Videos or tutorials to watch?
One place to start is to study the data sheet for the bill acceptor, and learn what the Arduino should do with the control and data signals.
Assuming you already know the basis of Arduino C programming (hope so), you should start googling around a bit to see what others did with similar problems, and find something like THIS.
But, as @jremington said, you need to know your device first by carefully reading your specific model data sheet (this is a good practice for any project!), not all of them work exactly the same way (some have serial, some just send TTL pulses, or USB, RS485...).
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