Review on 🔍 XINGYHENG 5Pcs HC-SR505 Micro Body Sensing Module: Efficient PIR Motion Detector for DIY Electronic Projects by Randy Bin

Received today and did some testing. Be careful if you have a short time to check. When you first turn it on, it takes a long time (I'd call it warming up) to settle down. I tested with a stable 5V DC laboratory power supply. After it settled down, the signal line was in a LOW state. When I waved my hand in front of the elder, he stood up quickly. Now a problem for some people. the output remains HIGH for about 10 seconds. For some it would be ok. As with most articles on Revain, there is very little information. You need reviews or already know the product. When counting people or similar objects, this is a way to slow down accurate counting. 10 people could easily pass in 10 seconds and count as one. A second would be better. To sense the existence of a person present without having to count, this works well. I just want other buyers to get some information about it. It said there were 25 reviews but only about 4 appeared in the list. Let's see if mine fits. This is a good size to add to my designs.