This is Smart Distribution Board based on ESP8266

Watch how it works https://youtu.be/YGajnfcQebY

Read this if you have any problems: #1

This is the final curcuit:

This is components you need for the project:

PZEM-004T: https://s.click.aliexpress.com/e/_c3LJ53kj

ESP8266: https://s.click.aliexpress.com/e/_De5gu7f

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/_c3icY5Ar

Pin Header: https://s.click.aliexpress.com/e/_c2zNwZSn

5V relay module: https://s.click.aliexpress.com/e/_AAXY9i

1602 I2C Display: https://s.click.aliexpress.com/e/_c2zNQH7p

UPDATE

23/11/2025 Core 3.1.2, a lot of changes.

P.S. I modified the LiquidCrystal_I2C library, I removed Wire.begin(); we call it from setup instead, with our pins Wire.begin(4, 0); Use the one provided in use_these_libs.zip

Uploading files from data folder

There is a file manager at 192.168.x.x:8089/littlefs

Content from data folder should be uploaded to littlefs (format & upload), should be like this: Ignore that it says ESP32, we use ESP8266 :)

After uploading, the main page is at 192.168.x.x:8089 (port is 8089)

Serial

Note that I use Serial for PZEM004Tv30 module

PZEM004Tv30 pzem(&Serial);

Other information goes to Serial1 not Serial (so you will not see things in serial monitor)

Serial1.begin(115200);