WWZMDiB 5Pcs HC-SR501 PIR Motion Sensor Module + 2Pcs Exclusive housing for Arduino Raspberry Pi Toys, Lamps, Electronic Equipment WWZMDiB 14 ratings View Product Buy it on Amazon More info 2 ...

It can optionally turn these back on when you are seated again. The cheap HC-SR501 PIR module’s range can also be adjusted with a trimpot for your specific scenario.

But to prevent any wet and angry pedestrians, a HC-SR501 PIR motion sensor is used. If the system sees motion it will stop for a while to let the activity quiet down.

TK has combined a PIR with an Arduino to create a smart safety light for the house or workshop. Follow along as this gets built out into a more extensive project.