Back in 2015, after completing my first year of EEE at Imperial College, my tutor offered an interesting research opportunity. The project was to design an affordable but capable 3 Phase Power Meter. The meter was to be able to work in a sort of swarm/network and communicate wirelessly to a central server.
The idea behind the meter was to be able to perform thorough analysis on various loads/points on the grid. After much deliberation, I came up with a scheme where 3 synchronised ADC’s (1 per phase) sampled the voltage and current and dumped the samples onto a fairly capable DSP. The DSP would them communicate with an on-board ESP8266 which would finally send that data to a server.
The meter itself also had the capability of displaying the data on a LCD, as it had an onboard DSP you could even display a split screen between FFT and time domain plots!
The ADC sample at 8KHz and output 24 bit words.