Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By btidey
#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.
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By ian
#67439
btidey wrote: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
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By Lisergio
#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 !!!