PIR module usually requires an initial warm-up period for the sensing elements to come up to the operating mode. This usually takes not less than 30 seconds. So a 30 seconds delay is intentionally ...

Extra abilities with Arduino, Raspberry Pi, and more With a PIR sensor, a power supply and a voltmeter, you’re well on your way to some cool tech. Jeremy S. Cook ...

With just a Wemos D1 Mini, a standard PIR sensor, and some open source code, you can create a practical self-contained motion sensor module that can be placed anywhere you want to keep an eye on.