If you’ve ever put your finger on an ESP8266 module when it’s really working, you’ll know what went wrong here: the ESP8266 heated up the board and gave a high reading on the temperature sensor.

Somehow 2.4Ghz wifi from esp8266 is triggering motion sensor. I tried shielding sensor with aluminium foil, adding capacitors… nothing helped. I googled and found that I’m not the only one.