1. The working principle of the vending machine
: The working principle is roughly that when the goods are available, the receiving currency is recognized, the customer selects the goods, and judges whether the input amount is enough, whether the change in the machine is enough for change, shipping, and change. The internal control system of modern vending machines
adopts VHDL description language, and uses finite state machine to describe the system state. After power-on reset, the system automatically initializes and converts different states (such as coin-operated state, sales state, change) according to external input signals. state). The working principle of the internal structure of the vending machine 2. The core of the vending machine is the single-chip microcomputer. The vending machine has its own dedicated communication protocol, the European and American series are 'MDBThe main control board, banknote recognizer, and coin manager (receiving recognition, change change) all follow this protocol. The same series (European and American series or Japanese and Korean series) have strong versatility, not only the communication protocol is the same, but also the installation size and connection The same is true for plugs. ' An unmanned vending machine (VendingMachine, VEM) is a machine that can automatically pay for goods based on the coins you put in. Vending machines are commonly used equipment in commercial automation. They are not restricted by time and location, and can save manpower and facilitate transactions. It is a brand-new form of commercial retail, also known as a 24-hour micro supermarket. At present, there are four common vending machines in China: beverage vending machines, food vending machines, comprehensive vending machines, and cosmetics vending machines.
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