PZEM-004T v3.0

Arduino communication library for Peacefair PZEM-004T-10A and PZEM-004T-100A v3.0 Energy monitor.

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This module is an upgraded version of the PZEM-004T with frequency and power factor measurement features, available at the usual places. It communicates using a TTL interface over a Modbus-RTU like communication protocol but is incompatible with the older @olehs library found here: https://github.com/olehs/PZEM004T. I would like to thank @olehs for the great library which inspired me to write this one.

Common issue:

Make sure the device is connected to the AC power! The 5V only power the optocouplers, not the actual chip. Also please be safe, AC is dangerous. It can cause more serious issues, such as death. You are responsible for your own stupidity. So don't be stupid.

Manufacturer (optimistic) specifications

Function	Measuring range	Resolution	Accuracy	TODO: Realistic specifications
Voltage	80~260V	0.1V	0.5%
Current	0~10A or 0~100A*	0.01A or 0.02A*	0.5%
Active power	0~2.3kW or 0~23kW*	0.1W	0.5%
Active energy	0~9999.99kWh	1Wh	0.5%
Frequency	45~65Hz	0.1Hz	0.5%
Power factor	0.00~1.00	0.01	1%

* Using the external current transformer instead of the built in shunt

Other features

• 247 unique programmable slave addresses
  • Enables multiple slaves to use the same Serial interface
• Over power alarm
• Energy counter reset
• CRC16 checksum
• Better, but not perfect mains isolation

Example

#include <PZEM004Tv30.h>

PZEM004Tv30 pzem(&Serial3);

void setup() {
  Serial.begin(115200);

  Serial.print("Reset Energy");
  pzem.resetEnergy();


  Serial.print("Set address to 0x42");
  pzem.setAddress(0x42);
}

void loop() {
  float volt = pzem.voltage();
  Serial.print("Voltage: ");
  Serial.print(volt);
  Serial.println("V");

  float cur = pzem.current();
  Serial.print("Current: ");
  Serial.print(cur);
  Serial.println("A");

  float powe = pzem.power();
  Serial.print("Power: ");
  Serial.print(powe);
  Serial.println("W");

  float ener = pzem.energy();
  Serial.print("Energy: ");
  Serial.print(ener,3);
  Serial.println("kWh");

  float freq = pzem.frequency();
  Serial.print("Frequency: ");
  Serial.print(freq);
  Serial.println("Hz");

  float pf = pzem.pf();
  Serial.print("PF: ");
  Serial.println(pf);

  delay(1000);
}

Installation instructions

You should be able to install the library from the Library Manager in the Arduino IDE. You can also download the ZIP of this repository and install it manually. A guide on how to do that is over here: https://www.arduino.cc/en/guide/libraries

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Thank you to @olehs for inspiring this library.