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WiFi MQTT controlled relay for Home Assistant

I’ve been wanting to use a ESP8266 WiFi module in a project for some time now, and after reading about the WeMos board I figured this was the easiest way to get started. The WeMos D1 mini is quite small, and much easier to interact with and program than the ESP8266 devices. So I built this single relay controller, with internal temperature reporting. I am communicating with it using MQTT, which makes it really easy to implement it into things like Home Assistant.