The hardware was assembled by connecting the Arduino UNO R4 WiFi, the PZEM 004T, the current transformer, and the OLED ...
It's a solved problem, but I actually prefer a simple web UI.
This is a ready-to-go PCB to connect a bare epaper display (salvaged from a used Electronic Shelf Label) to a microcontroller (like ESP32) via SPI. The driver board is compatible with at least the ...