How Do ATMs Always Give The Right Amount Of Bills Each Time?

How Do ATMs Always Give The Right Amount Of Bills Each Time?

Video: All I ever want in life is for an ATM to spit out an extra 20 dollar bill one time. This never happens! Vending machines have given me two bags of chips. I’ve gotten an extra chicken nugget here and there. Sometimes even the glorious onion ring in an order of fries. But the cash machine never messes up for me. Here’s how it manages to do that: with a series of rollers — some serrated, some smooth — that send the bill to a conveyor belt to get scanned with a sensor.


The Cheapest NBN 50 Plans

It’s the most popular NBN speed in Australia for a reason. Here are the cheapest plans available.

At Gizmodo, we independently select and write about stuff we love and think you'll like too. We have affiliate and advertising partnerships, which means we may collect a share of sales or other compensation from the links on this page. BTW – prices are accurate and items in stock at the time of posting.