Using an Arduino, coin acceptor, LCD screen ... a technique sure to win any geek lover’s heart. Vending machines are popular builds for hobbyists, as they are a fun way to combine electronics ...

An curved arrow pointing right. Modern vending machines are wizards at figuring out what kind of coin you put in and how to make sure your snack actually drops to the bottom where you can pick it ...

this coin-operated holy water dispenser was used in Egyptian temples to dispense water for ritual washings. Worshippers would place a coin into the machine and receive holy water to bathe themselves ...