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

As other reviewers have noted, these sensors have an oddly narrow output voltage range. You can easily get them to work with Leonardos and UNO digital GPIO pins. You can also get them to work on WeMos D1/ESP8266 3.3V devices with a little care as there are many unique pin configurations. What I have: A0: Works between 4 and 1024D0: Initialize with INPUT_PULLDOWN_16 and connect the sensor directly to D0D3/D4 (and possibly other standard GPIO pins): Initialize with INPUT_PULLUP and add a 10k pullup resistor to pin. It's great for small, compact (and cheap) sensors, but requires a bit more setup than more rugged IR boards.