ESP8266 Community Forum

- Mon Mar 04, 2019 4:58 am #80905 Hello all,
I have a bunch of these PIR salvaged from led lights dead after an year.

They are meant to be connected to the 220 VAC directly.
I was thinking to use a sonoff, connect to main input leads then connect the sonoff gpio ground to the negative output (small black wire) and a free gpio to the positive output.
Would this work?

- Tue Mar 05, 2019 4:08 am #80914 I have to add that powering the pir pcb with 220V no voltage is coming out from the two small wires :/

- Tue Mar 05, 2019 4:17 am #80915 Here some updated pics.
Unfortunatly no output voltage is coming out from the small leads while waving my hands in front of the sensor

- Tue Mar 05, 2019 7:22 am #80919 You really always want to isolate mains power from any GPIO.

It wouldn't surprise me if the entire circuit (PIR-board and LED-board) runs on a lower voltage and use simple capacitor droppers to step down the voltage.
I think it would be wise to first reverse engineer the schematics before doing anything else: perhaps with some modifications you can run all off a safe(r) power supply.

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.