AC Digital Multifunction Smart Meter using
Arduino and PZEM-004TSmart Meter

Smart Meter using PZEM-004T for the measurement of Electrical parameters like voltage, current, active power and energy,power factor and frequency.


  • Electrical parameter measurement function
    • Voltage, Current, Active power
  • Serial communication (TTL serial interface)
  • Easily interface with Arduino and other microcontrollers
  • Customise for any measurement projects
  • Working voltage: 80 ~ 260VAC
  • Test voltage: 80 ~ 260VAC
  • Rated power: 100A/22000W
  • Operating frequency: 45-65Hz
  • Measurement accuracy: 1.0 grade


Every management system is trying to make an automatic, portable, accurate and reliable system to for measurement. This project work presents a novel smart meter for an automatic and superior metering, billing and warning system. The integration of the Arduino and LCD provide the meter reading system with some automatic functions that are pre-defined. The proposed energy meter system can incorporate with an embedded microcontroller and PZEM-004T AC Digital Multifunction Meter designed by Peacefair . PZEM-004T having the ability to measure Electrical parameters such as voltage, current, active power and energy, power factor and frequency. Measured parameters are directly transmitted with TTL serial interface with Arduino nano board and display on 16*2 LCD Display.

Our implemented project is able to provide all required measurements for metering and billing with high fidelity. Some of the special features of our project is

  • Overload alarm function
  • AC Voltage and Current Measurement with a range of 80 ~ 260VAC which cover major country voltage range like 110V and 230V and 0 ~ 100A current measurement capability.
  • Power measurment range is 0 ~ 22kW and energy range 0 ~ 9999kWh.
  • Frequency mesurment 
  • Power Factor measurment 

Key Words

SMART Energy Meter, AC Digital Multifunction Meter, Arduino, PZEM-004T, AC Voltmeter, Digital Ammeter

Block Diagram

Project Objectives

Block Diagram arduino smart meter

Design and develop energy measurement system which is reliable, portable, accurate and low cost. Smart energy and power monitor shows you how much energy consumption using in money. So you can see what consumer spending by the minute. Knowing more about how much energy things use, will help you choose the way you use them and save energy.

Circuit Discription

The physical dimensions of the PZEM-004T board is 3.1×7.4 cm, The pzem-004t module is bundled with 33mm diameter current transformer coil. The main part of the PZEM-004T module is the SD3004 chip from the SDIC Microelectronics Co., Ltd. In addition, the board having the EEPROM from Atmel(now microchip) 24C02C which is a 2K bit Serial Electrically Erasable PROM with a voltage range of 4.5V to 5.5V. with More than 1 Million Erase/Write Cycles and 200+ Years Data Retention. Two optocouplers PC817, providing galvanic isolation of the serial interface.

Circuit Diagram

Circuit Diagram



Arduino based Project


The open-source Arduino Software (IDE) makes it easy to write code and upload it to the board.  IDE allows you to write programs in C & C++ Language and upload them to your board.

Electrical projects


The software is used mainly by electronic design engineers and electronic technicians to create electronic schematics and electronic prints for manufacturing printed circuit boards.

Matlab And Simulink projects for electrical engineering

MATLAB Simulink

MATLAB is the easiest and most productive software environment for engineers and scientists. Simulink, developed by MathWorks, is a graphical programming environment for modeling, simulating and analyzing multi-domain dynamical systems


No Hardware Description Specifications Buying Options Details
  One   Two   Three
01 Arduino Nano V3.0 IGStore amazon × Learn More
02 LCD Display 16*2 IGStore × × Learn More
03 AC Digital Multi function Smart Meter PZEM-004T IGStore × × Learn More
04 Genral Purpose PCB 4″*4″ Ebay amazon IGStore Download
05 Relay 5V , 230V/7A Ebay amazon IGStore Download
06 RGB LED 5mm Ebay amazon IGStore Download
07 Power Supply 7809 Ebay amazon IGStore Download
07 Power Cord 2 pin, 5A Ebay amazon IGStore Download
07 Power Cord 2 pin, 5A Ebay amazon IGStore Download


  • Portable Energy and Power Meters

  • Grid Monitoring

  • Smart Energy Meters

  • Smart Plug


  • High Accuracy

  • Portable and Small size

  • Easy assembly and programming.

  • High Voltage and Current Range

  • Reduced space


  • Voltage below 80V cant be measured


In an application of Smart meter using IOT platform utility can remotely monitor and control the consumption of consumers.

IOT based feeder automation and Wireless Energy Consumption Control based on Prioritised Load Switching


Best project for  Electrical Engineering Students

With over Over Voltage- Under Voltage Protection, Voltage Measurement Current Measurement, Power And Energy Measurements, are easily possible with this projects.

Mr. Pramil Wakchaure


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