How to Use ZMCT103C CURRENT SENSOR: Examples, Pinouts, and Specs

The ZMCT103C current sensor is a compact, high-precision device designed for measuring AC current up to a specified range. This sensor is widely used in power monitoring systems, energy management applications, and for current monitoring in various electronic projects. Its small form factor and ease of use make it a popular choice for hobbyists and professionals alike.

• Home energy monitoring systems
• Industrial automation
• Overcurrent protection circuits
• Smart power management in IoT devices
• Electrical load monitoring

• Input Current Range: 0 to 5A AC
• Output Voltage: 0 to 1V (linearly proportional to AC current)
• Supply Voltage: 5V to 30V DC
• Accuracy: ±1%
• Operating Temperature: -40°C to +85°C

1. Power Supply: Connect the +V pin to a DC power supply within the range of 5V to 30V.
2. Ground Connection: Connect the GND pin to the ground of your circuit.
3. Output Signal: Connect the OUT pin to an analog input of a microcontroller, such as an Arduino, to read the sensor's output voltage.

• Ensure that the AC current being measured does not exceed the sensor's maximum rating of 5A.
• The output voltage is linearly proportional to the AC current. Calibration may be required for precise measurements.
• Avoid placing the sensor near high magnetic fields to prevent interference.
• Use twisted pair wires for the connections to reduce noise pickup.
• Keep the sensor away from high-temperature sources to maintain accuracy.

// ZMCT103C Current Sensor Example Code for Arduino UNO

const int sensorPin = A0; // Analog input pin connected to ZMCT103C OUT pin
float sensorValue = 0;    // Variable to store sensor value

void setup() {
  Serial.begin(9600); // Start serial communication at 9600 baud rate
}

void loop() {
  sensorValue = analogRead(sensorPin); // Read the sensor output
  float current = sensorValue * (5.0 / 1023.0) / 0.185; // Convert to current (A)
  
  Serial.print("Current: ");
  Serial.print(current, 3); // Print the current with 3 decimal places
  Serial.println(" A");
  
  delay(1000); // Wait for 1 second before reading again
}

Note: The conversion factor 0.185 is based on the sensor's typical output of 1V at 5A. This value may need to be adjusted for calibration.

• Inaccurate Readings: Ensure proper calibration and that the sensor is not subjected to external magnetic fields.
• No Output Voltage: Check the power supply connections and ensure the AC current is within the measurable range.
• Sensor Overheating: Make sure the current does not exceed the sensor's maximum rating and that there is adequate ventilation.

• Calibration: Use a known current source to calibrate the sensor's output.
• Wiring: Verify all connections are secure and free from shorts or opens.
• Environment: Install the sensor in a location with minimal electrical noise and away from heat sources.

Q: Can the ZMCT103C measure DC current? A: No, the ZMCT103C is designed to measure AC current only.

Q: What is the sensitivity of the sensor? A: The sensor has a sensitivity of approximately 0.185V/A, meaning for every ampere of current, the output voltage increases by 0.185V.

Q: How can I improve the accuracy of my measurements? A: For improved accuracy, calibrate the sensor with a known current source and ensure that the analog-to-digital conversion in your microcontroller is accurate.

Q: Is it necessary to use a burden resistor with this sensor? A: No, the ZMCT103C has a built-in burden resistor, so an external one is not required.

Q: Can I use this sensor with a 3.3V microcontroller? A: Yes, but you will need to scale the output voltage accordingly, as the sensor's output is designed for a 5V ADC reference.