does anyone know how a bill validator(aka the thing that takes your dollar in a vending machine) work?
i've been wanting to make a vending machine, and i have built a quarter mechanism , yet i want to have a mechnasim to take dollar bills. the easiest way to do this is to take a existing bill validator and hook it up to a micro controller. yet to do this i need to know how it works. is the the system self contained (if i plugged it in to a power source would it work) or would i have to hook it up to a main controll system.