Moderator: igrr
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.
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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.