How does a vending machine identify the face value and authenticity of the money invested

How does the vending machine identify the face value and authenticity of the money invested? When you throw a coin into the vending machine, how does it determine the size of the coin? How does the banknote determine the denomination? And... how is it achieved? Coin detection mainly starts from three aspects: size, material, and weight. Needless to say the size, the counterfeit currency can't pass this level is to die. Material detection relies on electromagnetic characteristics. Since genuine coins use special mixed metal materials, a specially designed high-frequency oscillator circuit can distinguish the magnetic impedance of the material more efficiently. In order to screen out counterfeit coins. In addition, there is a small mystery here. The magnetoresistance of the coin is also related to the size, and the size detection is completed in disguise. The comparison of weight is more interesting. The vending machine has designed a coin 'trackOtherwise, it's fake~ But one more sentence: I'm really tired of coin fraud. . . If you don't have a large channel, you have to spend a little bit of money. If there is a channel, he will definitely be caught. . . I don't know how much gross profit each coin needs to make a profit without losing it? Recognizing denominations and authenticating banknotes can be done at the same time. There are dozens of identifiable features in most domestic and foreign banknotes, including various watermarks, various embedded materials, various pattern details, various concave-convex engravings, and various fluorescent patterns. At the time of recognition, the basic recognition methods include size recognition, pattern recognition, optical recognition, magnetic recognition, etc. Nowadays, currency detectors generally select certain features to recognize. If the recognition is successful, the authenticity of the banknote is If you know it, you will know the denomination. That's all for today's sharing. If you want to learn more about Guangdong unmanned vending machines, please follow the official website. The author will regularly update relevant industry information for everyone. Prev: Analysis of the points of the vending machine business model Next: Briefly describe how the adult product unmanned vending machine market is