Generated codes can also be viewed via serial. For the hardware, all you need is the ESP8266 and a display. Naturally [Lady Ada] uses her own particular spin on both devices which you can purchase ...

When I needed to extend the range of some ESP8266-based sensors, cantennas were right at the top of my list of things to try. It was easy enough to build one, attach it to a Wemos Mini D1 Pro ...