Weewooday 10 Pieces Am312 Pir Sensor Mini Pir Motion Sensor Infrared Human Body Pyroelectric Infrared Motion Module 2.7v to 12v

Excellent mounting ability. Simple press fit and they hold nicely. The plastic mount also comes apart in three pieces allowing for easy mounting when the wires are soldered up. Leads come out pretty easy to solder up my own wires. Makes it even more compact! They are very directional. 501 sensors that I used to use had a little better width range, but distance is comparable with these guys running on esp12fs reporting to home assistant through esphome. They’re excellent. Buy them you won’t regret it.

love the size

9 of the 10 work very well. The 10th one is different but does work. Most of them have an on period of about 1 second minimum (measured 950mS to 1.2 S), number 10 is about 2.5 seconds. Sensitivity seems good on all axes. The plane along the circuit board may be a bit more sensitive but just marginally in close tests. The blocking time is around 2 seconds (except for #10 which is about 5 seconds).The output with no load drive high to about 3V during detection. Note that this output cannot tolerate much loading at all, even a 10K resistor to ground will drop the output to near 2V. I plan to drive a 2N7000 MOSFET to buffer the signal. An NPN transistor with a 10K base resistor will also work but not quite ideally. I did not test power consumption or for false triggers yet.Overall, I am fairly pleased except that I wish the tenth one was as consistent as the rest.

These worked great even at 3.3V bias. I used them directly off the ESP8266 sonoff basic and Shelly devices.

I really needed these to work on a project I had to finish and it was exactly what I needed.

on off sensitivity ok. detection on time is short.

It doesn't work like advertised!

So these little things output 3.3 volts when there's motion detected... wait a minute... No no not when motions detected! These aren't motion detectors! They detect hot things like a cup of coffee or when the surrounding temperature is not the Arizona desert where I'm at I'm sure they would detect people just fine... When it's 101° outside they don't really work too good. By the way it's 3.3 volts for hi-state output and the current out is "you better have some FET input amplifier cuz these things can't drive crap". So whether you have 12 volts on it or 5 volts on it the output high is 3.3 volts. To be used in cooler environments as well. And this remembrance of previous times for the on state or high output is BS.