Enter the ESP8266 and some programming wizardry. [Sebastian] is using a NodeMCU but suggests that it ... Once that fills, a GPIO pin is pulled down and the ESP8266 sends the data to a waiting ...

ESP8266 development boards like the Wemos D1 Mini and NodeMCU are an excellent way to get a one-off project up and rolling quickly, but their size and relative complexity mean they aren’t ...