The total magnetic field of the pole is almost zero as the L and N magnetic fields cancels each other. ... Gut the big one and put the small charger and the esp8266 in it and connect everything up.

That's where an ESP8266 comes in. It's basically a Wi-Fi microcontroller that you can hook up to more or less anything, and there are a few reasons why you should consider it as the centerpiece of ...

At regular intervals throughout the day, the ESP8266 polls the ATtiny13 to pull the stored sensor pulses and voltage measurement. ... It’s not necessary to rely on a magnetic coupling.