ESP8266 Community Forum

- Mon Jul 01, 2019 9:17 am #82961 Hi, I had some fun with false triggering of PIRs on a project of mine. The method that finally worked for me was to cover the non-PIR sensor side of the board with an electrically insulating material and then aluminium cooking foil (I only needed to do one side of the board). Obviously the insulating material was to prevent the Aluminium foil shorting out components on the PCB. As long as the PIR sensor and the ESP where separated by the foil I didn’t get false triggers, you’ll have to work out the best relative positions as the foil can also block the WIFI signal to the ESP.

- Wed Jul 03, 2019 3:04 am #82973 Most PIR sensors seem to have a problem with wifi signals triggering the sensor.

One can avoid this using the screening as suggested. Also if the sensor is being used in a battery powered application using deep sleep then the issue can also be avoided by using the sensor output to wake up the ESP8266 which does any notification work and then reverts to deep sleep. This way the wifi is off in sleep and no false triggering occurs.

- Wed Jul 03, 2019 3:52 am #82975 A PIR sensor is an electronic sensor that measures infrared light radiating from objects in its field of view. Normally this type of sensor would be used as a motion or proximity sensor.
Best Sandwich Makers India 2019

- Wed Jul 03, 2019 5:53 am #82976 The PIR sensor has a high pulse on startup. SO remove the pull up resistor and add a PULL DOWN 1K-10K Resistor and Set Code to STOP Taking Inputs for 5 Seconds on Start.

Also PIR sensor does not takes Voltage Lower than 4.8V (BAD 3.3v Regulator on PIR).
Don't Power it from 3.3v Line.

Also you can remove false detection of cats/dogs by mount a Round Pipe 1-2 Inches Long and Apply Black Tape the Outer Area of the Pir.