Review on 🏃 Highly Efficient DIYmall HC SR501 Motion Infrared Arduino for Enhanced Arduino Projects by Joseph Katipally

Tried 3 out of 5 sensors and none of them worked with Arduino Uno WiFi Rev2. I thought the Arduino might not be providing enough voltage, but after measuring it with a multimeter, I registered 5.01V. The two devices pulled the output pin high a couple of times, but then no motion was detected. The remaining block always had the output pin high. I took one to work and hooked it up to a desktop power supply and an oscilloscope and it behaved the same from 5v to 8v. The volume was always recorded high at the output. I didn't even open the rest of the blocks and just sent everything back. It could be bad luck, but what is the probability that all 3 randomly selected units out of 5 will not work.