ESP8266 Community Forum

- Wed Jun 21, 2017 5:49 am #67429 Most PIR sensors actually work at 3.3V internally and have a small 5V to 3.3V regulator on board.

It is fairly easy to bypass the regulator and power it directly from 3.3V supply. I modify all my PIR sensors this way.

See for example http://randomnerdtutorials.com/modifying-cheap-pir-motion-sensor-to-work-at-3-3v/

I solder on a jumper post so that I can plug in as normal.

- Wed Jun 21, 2017 9:57 am #67439

Most PIR sensors actually work at 3.3V internally and have a small 5V to 3.3V regulator on board.

It is fairly easy to bypass the regulator and power it directly from 3.3V supply. I modify all my PIR sensors this way.

See for example http://randomnerdtutorials.com/modifying-cheap-pir-motion-sensor-to-work-at-3-3v/

I solder on a jumper post so that I can plug in as normal.

I was just about to say the same thing... Many of these modules have jumpers installed anyway. If all else fails it's not so difficult to put a blob of solder between the IN & OUT of the regulator. Or if you use a WeMos or NodeMCU device, power the PIR from Vin (5v from USB) the outputs are 3v3 max (because of the regulator). There is a load of stuff about this on the web.
Ian

- Wed Jun 21, 2017 3:17 pm #67448 I have tried the resistance and capacitor and it has improved, but still detecting every 15 minutes ...
I have also checked 3.3v and it works best...
I have tried with other derivatives and it works OK, so some detectors do not work properly and others do.

Thanks !!!