HiLetgo 3pcs MINI SR602 Motion Sensor Detector Module Pyroelectric Infrared Sensory Switch High Sensitivity for Arduino PI

Great little PIR sensor, great range and sensitivity. Works as advertised. all three worked.

Using this motion sensor for my ESP32 CAM board, wake up board when motion is detected. Drive entire board with 3.7 Volt battery (charger TP4056). Works fine. No issue hence 5 stars.

PIR detector worked as expected in my Arduino ESP32 project. Fixed sensitivity and delay times worked fine for me but these can be changed by resistor additions. Just search for SPEC sheets on the WEB, match to these units, and follow instructions to modify sensitivity & delay settings.

Quantity ODD, Had to buy two sets to get 4 pieces.One unit was bad!

It senses motion, mine only senses in a line in front of it and not to the sides, but that is likely my fault as the sides are blocked.

I've tested them out to about 8', they see me moving every time. I'm looking forward to getting more for other projects.

Last review I commented that this PIR motion sensor functions incorrectly.I double check my board I have found that one of DC voltage filter capacitors is bad soldered that make voltage supply to the sensor fluctuated and affect the sensor's output.Bottom line, the sensor is well designed with low profile, more art

After trying these modules out for a while, I can now say that the ones that work, worked great. I added a LDR to one of them which I then used in a project (motion sensing "trip wire" with LED's and piezo buzzer) that has worked great ever since.The second one I received worked at first, but it had an issue. I tried putting on a higher value resistor in order to increase the outputs delay, as stated in the description, but the module couldn't handle it and just barely had any output voltage, so I was forced to put the 0 ohm back on.The third one I received was DOA. After removing/testing all of the components, it seems that the PIR sensor itself is inoperable. I guess I'll keep the rest for spare components.I would definitely suggest purchasing the SR-501 modules, which seem more reliable. The AM-312 has also worked well for me in the past and are a smaller module for those that may need that feature for their project.