Review on 🔍 Onyehn IR Pyroelectric PIR Motion Sensor Modules - Pack of 2pcs | DC 2.7 to 12V Detector for Infrared Detection by Kirt Phillips

It works as expected: looks accurate and connects easily to the Arduino (more on that below). Unfortunately, one of the two devices did not work (output pin was always "high"). I won't return it because I used valid in my project. I will buy more but probably from a different seller. WRT interface, output "high" seems to be 1.5V lower than the power. In my case this came in handy because I had a handy 5V power supply with a 3.3V microprocessor (esp8266). I believe it would also work if the supply was 3.3V. It would be great if this was documented. Or if there were charts.