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.

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);
}

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Thank you to @olehs for inspiring this library.