Watch how it works https://youtu.be/YGajnfcQebY
This is the final curcuit:
The project uses SPIFFS to store files on ESP8266, upload them to the ESP8266 (read about SPIFFS if you dont know what that is.)
After flashing connect to "PowerControlESP | Offline" pass is "PowerControlPass" then go to 192.168.4.1 and connect to your network.
Power server is at 192.168.x.x:8089
PZEM-004T: https://s.click.aliexpress.com/e/_9hYStD
ESP8266: https://s.click.aliexpress.com/e/_97j7kp
Resistors: https://s.click.aliexpress.com/e/_9AslPB
Electrolytic Capacitor: https://s.click.aliexpress.com/e/_A2atvx
PCB 6X8: https://s.click.aliexpress.com/e/_d7XpQnS
Pin Header: https://s.click.aliexpress.com/e/_AUvLzT
Female PCB Header: https://s.click.aliexpress.com/e/_AClQip
5V relay module: https://s.click.aliexpress.com/e/_AAXY9i
1602 I2C Display: https://s.click.aliexpress.com/e/_AF3L2o