ESP8266 Community Forum

The solution I found to this problem is use a 10k resistor between the PIR output and the input pin of the ESP8266. I tried all of the suggestions mentioned above (caps, switching off the wifi etc) but only the resistor worked. Another benefit is the that Wifi can now be connected at the start (and disconnected at the end) of the program rather than for each message, as this can be slow

Not sure if 10K is the best value, someone else may find a better value, but for now, for me it works great.

John