ESP32 скетчик про помониторить напряжение батарейки
Setup
* Measure voltage
* List data files, determine next number
* Open data file, log initial voltage, time since start
* Read configuration
* Init WiFi
* Init internet date
* Log initialisation result
* Close data file
Loop
* Open data file
* Measure voltage
* Take current time
* Log voltage
* Close data file
* Sleep