If you read my previous post , I’ve been on a journey to make my freezer smarter. As it turns out, freezing a SmartThings ZigBee Multisensor tends to destroy CR2450 batteries. I’m sure that, coupled with the continuous temperature rise and drop contributed to this solution not working for me.
After doing EXTENSIVE searching for the “right” solution, I found a few battery powered options. I wanted something hardwired to power, with a waterproof temperature sensor. To my surprise, this product category did not exist. So I set out to make my own solution.
My goal here is to show you everything you need to know about making a ESP8266 Wi-Fi node that communicates via MQTT and/or directly publishes to a SmartThings HUB. I’ll share the hardware, schematics, code, and some pictures of the finished product.