1. Customers insert coins into the coin acceptor, which then identifies the coins. If a fake coin is detected, it records the data and dispenses it.

2. After the currency is identified, customers select items by pressing buttons based on the amount. Items cannot be purchased if the amount is insufficient.

3. The sensor receives button information, driving the relevant components. The product is delivered to the pick-up point.

4. Customers can continue to purchase or request refunds based on their remaining balance. If no action is taken within 15 seconds, the vending machine will automatically return the coins.

5. Customer picks up the goods, completes the purchase.

The above has introduced the shopping process of the vending machine, hoping it will be helpful to you all.