How to Use PZEM-017: Examples, Pinouts, and Specs

The PZEM-017 is a digital multi-meter manufactured by PeaceFair, designed to measure voltage, current, power, and energy consumption in electrical circuits. This versatile component is widely used in monitoring systems for renewable energy sources, industrial machinery, home energy management, and other applications where precise electrical measurements are crucial.

• Voltage Measurement Range: 0 - 300V
• Current Measurement Range: 0 - 100A (requires external shunt)
• Power Measurement Range: 0 - 30,000W
• Energy Measurement Range: 0 - 99999kWh
• Measurement Accuracy: ±1.0%
• Operating Temperature: -10°C to 60°C
• Frequency Detection: 45Hz - 65Hz

1. Power Supply: Connect a DC 7-12V power source to the V+ and V- pins.
2. Voltage Measurement: Connect the circuit's voltage to be measured across the IN+ and IN- pins.
3. Current Measurement: Connect the external shunt across the Shunt+ and Shunt- pins. The load should pass through the shunt.
4. Communication: Use the RS485 A and B lines to communicate with the PZEM-017 using a compatible RS485 to TTL converter.

• Ensure that the power supply voltage does not exceed the specified range.
• Do not exceed the voltage and current measurement ranges to avoid damaging the device.
• Use twisted pair cables for RS485 communication to reduce electromagnetic interference.
• Always disconnect the power before making or changing connections to the PZEM-017.

• No Data on RS485: Check the connections and ensure that the correct baud rate and data format are used (9600 bps, 8N1).
• Inaccurate Readings: Verify that the connections are secure and that the external shunt is properly rated for the current being measured.

• Double-check wiring connections according to the pin configuration.
• Ensure that the power supply is stable and within the specified voltage range.
• Use a calibrated multimeter to verify the accuracy of the PZEM-017 readings.

#include <ModbusMaster.h>

// Instantiate ModbusMaster object
ModbusMaster node;

void setup() {
  // Initialize Modbus communication baud rate
  Serial.begin(9600);
  
  // Set slave ID of the PZEM-017
  node.begin(1, Serial);
}

void loop() {
  uint8_t result;
  
  // Read 10 registers starting at 0x0000 (Voltage, Current, Power, etc.)
  result = node.readInputRegisters(0x0000, 10);
  
  if (result == node.ku8MBSuccess) {
    // Process the received data
    float voltage = node.getResponseBuffer(0x0000) / 10.0;
    float current = node.getResponseBuffer(0x0001) / 100.0;
    // Add additional processing for power and energy
    
    // Print the measured voltage and current
    Serial.print("Voltage: ");
    Serial.print(voltage);
    Serial.println(" V");
    
    Serial.print("Current: ");
    Serial.print(current);
    Serial.println(" A");
  }
  
  // Wait for a short period before reading again
  delay(1000);
}

Note: This example assumes the use of a RS485 to TTL converter connected to the Arduino's serial pins. The ModbusMaster library is used for Modbus RTU communication. Ensure that the library is installed in your Arduino IDE before uploading the code to the Arduino UNO.

Remember to adhere to the 80 character line length limit for code comments, wrapping text as necessary.