Everyday Science
How do vending machines know what you picked?
Vending machines match your button choice to a slot inside. When you choose a snack, the machine checks the payment and tells the right part to move. Then the snack drops down.
Everyday Science
Vending machines match your button choice to a slot inside. When you choose a snack, the machine checks the payment and tells the right part to move. Then the snack drops down.