Unmanned vending machine is a machine that can automatically deliver goods according to the invested coins, and is a common equipment for commercial automation. At present, there are four types of common vending machines in China: beverage vending machines, food vending machines, comprehensive vending machines, and cosmetics vending machines. The general unmanned vending machine is composed of coin devices, indication devices, storage and vending devices, etc. Since the 70s, various new vending machines controlled by microcomputers and credit cards have been used instead of coins and connected to computers
