Will a Sonoff Basic (3.3 volts) power a HC-SR501 PIR Motion Sensor?

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Alternative firmware for ESP8266 and ESP32 based devices with easy configuration using webUI, OTA updates, automation using timers or rules, expandability and entirely local control over MQTT, HTTP, Serial or KNX. Full documentation at

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Will a Sonoff Basic (3.3 volts) power a HC-SR501 PIR Motion Sensor? #3059

Closed sparkgap closed 6 years ago

sparkgap commented 6 years ago

Does anybody know........ Will a Sonoff Basic (3.3 volts) power a HC-SR501 PIR Motion Sensor? Some places it indicates 3.3v is sufficient. Will the Sonoff regulator overheat? The Motion Sensor will be connected to GPIO14.

Lawrencezarb commented 6 years ago

MMy HC-SR501 is powered by my sonoff, but you need to feed bypass the voltage regulator on the PIR and feed the 3.3v directly to the board. There are several online instrcutions for this. as below

https://randomnerdtutorials.com/modifying-cheap-pir-motion-sensor-to-work-at-3-3v/

sparkgap commented 6 years ago

Great. Thanks

pcpaulo commented 6 years ago

i have followed the instruction to bypass the 3.3v, i am using lowest sensibility but my sonnoff still giving false detection.

Any suggestion?