How to Use ZMPT101B: Examples, Pinouts, and Specs

The ZMPT101B is a precision voltage transformer designed for measuring AC voltage. It provides an isolated output proportional to the input voltage, ensuring safety and accuracy in voltage measurement applications. This component is widely used in power monitoring, energy metering, and other applications requiring precise AC voltage measurement. Its compact design and high accuracy make it a popular choice for both industrial and hobbyist projects.

• Power monitoring systems
• Energy metering devices
• Home automation systems
• Industrial control systems
• Educational projects involving AC voltage measurement

The ZMPT101B is designed to provide reliable and accurate voltage measurement. Below are its key technical details:

The ZMPT101B module typically comes with a 4-pin interface. Below is the pinout description:

The ZMPT101B is straightforward to use in a circuit. Follow the steps below to integrate it into your project:

1. Power Supply: Connect the VCC pin to a 5V DC power source and the GND pin to ground.
2. Output Signal: Connect the OUT pin to an analog input pin of your microcontroller (e.g., Arduino).
3. Calibration: Use the onboard potentiometer (ADJ) to adjust the output signal for accurate voltage measurement.

Below is a simple example of connecting the ZMPT101B to an Arduino UNO for AC voltage measurement:

• Connect VCC to the Arduino's 5V pin.
• Connect GND to the Arduino's GND pin.
• Connect OUT to the Arduino's A0 pin.

// ZMPT101B AC Voltage Measurement Example
// Connect the ZMPT101B module to the Arduino as follows:
// VCC -> 5V, GND -> GND, OUT -> A0

const int sensorPin = A0;  // Analog pin connected to ZMPT101B OUT
float calibrationFactor = 1.0;  // Adjust this value based on calibration

void setup() {
  Serial.begin(9600);  // Initialize serial communication
}

void loop() {
  int sensorValue = analogRead(sensorPin);  // Read the analog value
  float voltage = sensorValue * (5.0 / 1023.0);  // Convert to voltage
  float acVoltage = voltage * calibrationFactor;  // Apply calibration factor

  // Print the measured AC voltage to the Serial Monitor
  Serial.print("AC Voltage: ");
  Serial.print(acVoltage);
  Serial.println(" V");

  delay(1000);  // Wait for 1 second before the next reading
}

• Calibration: The ZMPT101B requires calibration for accurate voltage measurement. Use the onboard potentiometer to fine-tune the output.
• Scaling: If measuring high AC voltages, ensure proper scaling and isolation to avoid damage to the module or connected devices.
• Safety: Always handle AC voltage with care. Ensure proper insulation and avoid direct contact with live wires.

1. No Output Signal:

   • Ensure the module is powered correctly (check VCC and GND connections).
   • Verify that the input AC voltage is within the module's range.

2. Inaccurate Voltage Readings:

   • Adjust the onboard potentiometer (ADJ) for calibration.
   • Check the calibration factor in your code and adjust as needed.

3. Fluctuating Output:

   • Ensure stable AC voltage input.
   • Use proper filtering in your circuit to reduce noise.

4. Module Overheating:

   • Verify that the input voltage is within the specified range.
   • Avoid prolonged exposure to high voltages without proper scaling.

Q1: Can the ZMPT101B measure DC voltage?
A1: No, the ZMPT101B is designed specifically for AC voltage measurement. It cannot measure DC voltage.

Q2: How do I calibrate the ZMPT101B?
A2: Use the onboard potentiometer (ADJ) to adjust the output voltage. Compare the output with a known reference voltage to ensure accuracy.

Q3: What is the maximum voltage the ZMPT101B can measure?
A3: The ZMPT101B can measure up to 250V AC with appropriate scaling. Ensure proper isolation and safety precautions when measuring high voltages.

Q4: Can I use the ZMPT101B with a 3.3V microcontroller?
A4: Yes, but ensure the output voltage does not exceed the microcontroller's ADC input range. You may need to adjust the calibration accordingly.

By following this documentation, you can effectively use the ZMPT101B for accurate AC voltage measurement in your projects.