Do you know how coin-operated drink vending machines recognize one-yuan coins?

There is a machine placed in a scenic spot that can provide items like a store. It is a coin-operated beverage vending machine. It can be opened 24 hours a day and is not limited by time and place. It reduces manpower and facilitates transactions. It is called a miniature supermarket. It is the shopping process as follows: (1) The buyer puts the currency into the coin slot, and the currency recognizer recognizes the currency invested. (2) The vending machine provides the information of the commodity that can be sold to the user through the indicator light of the selection button according to the amount. The buyer independently selects the product to be purchased (3) Press the button corresponding to the product selected by the user, the vending machine receives the information transmitted by the button, drives the corresponding components, and sells the product selected by the user to the pick-up port (4) If If you still have enough balance, you can continue to buy. Within 15 seconds, the vending machine will automatically find out the zero coins or the buyer rotates the coin return knob to withdraw the zero coins (5) Take out the zero coins from the coin return port to complete the transaction. Then how does the vending machine recognize one yuan? What about coins? .At present, the metal raw materials of the 1 yuan, 5 jiao and 1 jiao coins issued in our country are special alloys specially used for coinage. In the magnetic field, the difference in metal material and volume has a slight difference in the inductance, and the change in inductance causes the change in the oscillation frequency; then by detecting the change in frequency, comparing it with the set value, and determining the type of coin , the frequency signal is converted into a voltage signal output through a narrow-band frequency selection circuit, and the identification of metal coins is completed. That is to say, the vending machine is identified according to the diameter, material and thickness of the coin. There should be a detection element at the coin entry. After the coin is detected, the coil at the back will oscillate and begin to record the frequency value, and calculate the amount of change at the same time.
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