PZEM-004T V3.0 is the best for the purpose of the DIY project, where we need to measure the voltage, current, and power using Arduino/ESP8266/Raspberry Pi like opensource platform. In many electrical projects, engineer directly deals with measurements with few basic requirements like High galvanic isolation Parameter display Direct communication with a computer or microcontroller (Like Arduino or RPI boards) Data acquisition and storage with subsequent viewing or copying to the computer. This module serves all these basic requirements of measurement PZEM-004T as a separate board. The physical dimensions of the PZEM-004T V3.0 board is 3.1×7.4 cm, The pzem-004t module is bundled with a 33 mm diameter current transformer coil.
Features
Measuring consumed electricity Serial interface UART with a speed of 9600 Supply voltage 5V
Specification

