Answer:
The vending machine only takes input as quarters (25c), dimes (10c), and nickels (5c) and it will only return quarters, dimes, and nickels. Each input (25c, 10c, 5c) is a one-clock cycle wide pulse that is synchronous with the clock signal
These components include bill and coin validators, computer control boards, refrigeration units, and lighting.
Facial recognition technology was first introduced in vending machines in 2014, while many companies have been working on it for several years. The Luce X2 vending machine includes a motion sensor that knows when users are approaching and a camera that can recognize the consumer
