Cantennas outperform every consumer-grade Wi-Fi ... 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 ...

You have an ESP8266 board like the Wemos D1, a Li-Ion battery ... do pushbutton or sensor-driven wakeup, manage WiFi, and even read the battery voltage – all of these are a single line of ...