A PIR sensor on the front of the can detects when somebody gets close, and plays a message reminding them to make use of the trash cans provided on the playground.

What does PIR sensor actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

But if you’re looking for more projects involving PIR sensors, we have one that alerts you when your cat is back home. Meanwhile, check out this one in action after the break.