How do vending machines detect counterfeit money?
Vending machines are quite old and popular devices in developed countries. You can find drinks, snacks, chips… in these vending machines. Surely when looking at them, you will wonder how it works? What happens when we put money in there and how can it give out the exact amount of change?
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| (Photo: IT) |
Many people are even curious about how a vending machine can distinguish between real and fake money? Or how it knows how much money people put in it? Let's explore the mysteries inside these machines.
1. After inserting a coin into the machine, the metal block will pass through a laser light to measure the size of the coin. As a result, the vending machine can detect how much money is inserted?
2. The next step of testing is that the coin is passed through an electromagnet to measure the metal content inside. From there, it is determined whether the coin is real or fake.
3. After coin recognition, the machine will automatically arrange the coin into its correct column. Counterfeit coins will be moved to the reject slot.
4. If at this point the customer wants to cancel the purchase or return the change? The machine will automatically calculate to withdraw coins from the columns and return them. This is the reason why vending machines usually only accept certain types of coins.
5. If there is a counterfeit bill or the vending machine does not accept the coin, it will be oriented correctly and sent back outside to the visitor. What if your purchase gets stuck? An infrared sensor located near the exit will confirm whether or not an item is being taken out. If not, the coin will be returned to you.
Watch the video below to better understand how vending machines work:
According to Daikynguyen
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