He could then tell if the cat was around. Leaving the PIR sensor and the ESP8266 microcontroller (an Adafruit Huzzah) on all the time drained the batteries pretty quickly, so [rgrokett] decided to ...
The ESP8266 has become incredibly popular in a ... footprint of the stock D1 Mini and adds a DS18B20 temperature sensor, PIR motion detector, photoresistor, and some screw down terminals.
XDA Developers on MSN9d
4 reasons your next home automation controller should be an ESP8266 (and not a Pi)If you already have a ton of smart home devices and you're wondering what to do next, I recommend picking up an ESP8266.
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