How to Use PWR Meter 3 Click - 90A : Examples, Pinouts, and Specs

The PWR Meter 3 Click - 90A by Mikroe is a compact and efficient power measurement module designed for monitoring current up to 90A. It features an I2C interface, making it easy to integrate into microcontroller-based projects. This module is ideal for applications requiring precise power monitoring, such as energy management systems, industrial automation, and IoT devices.

• Energy consumption monitoring in smart homes and buildings
• Industrial equipment power usage tracking
• Battery management systems
• IoT devices requiring real-time power data
• Renewable energy systems (e.g., solar or wind power monitoring)

The PWR Meter 3 Click module uses a standard 8-pin mikroBUS™ socket. Below is the pinout:

1. Power Supply: Connect the module to a 3.3V or 5V power source via the mikroBUS™ socket.
2. I2C Communication: Connect the SDA and SCL pins to the corresponding I2C pins on your microcontroller.
3. Current Measurement: Pass the current-carrying wire through the onboard current sensor. Ensure the wire is properly aligned with the sensor for accurate readings.
4. Microcontroller Integration: Use the I2C interface to read current, voltage, and power data from the module.

• Current Range: Ensure the current being measured does not exceed the ±90A limit to avoid damage to the module.
• I2C Address: The default I2C address of the module is configurable. Refer to the datasheet for address selection details.
• Noise Reduction: For high-current applications, use proper shielding and grounding to minimize noise interference.
• Temperature: Operate the module within the specified temperature range (-40°C to +85°C) to maintain accuracy.

Below is an example of how to interface the PWR Meter 3 Click with an Arduino UNO using the I2C interface:

#include <Wire.h>

// Define the I2C address of the PWR Meter 3 Click
#define PWR_METER_I2C_ADDRESS 0x40

void setup() {
  Wire.begin(); // Initialize I2C communication
  Serial.begin(9600); // Initialize serial communication for debugging

  // Print a message to indicate setup is complete
  Serial.println("PWR Meter 3 Click - Initialization Complete");
}

void loop() {
  Wire.beginTransmission(PWR_METER_I2C_ADDRESS); // Start communication
  Wire.write(0x00); // Request data from the power meter (register 0x00)
  Wire.endTransmission();

  Wire.requestFrom(PWR_METER_I2C_ADDRESS, 2); // Request 2 bytes of data
  if (Wire.available() == 2) {
    int rawData = Wire.read() << 8 | Wire.read(); // Combine two bytes
    float current = rawData * 0.01; // Convert raw data to current (example scaling)
    
    // Print the current reading to the serial monitor
    Serial.print("Current: ");
    Serial.print(current);
    Serial.println(" A");
  }

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

Note: The scaling factor (0.01) in the code is an example. Refer to the module's datasheet for the correct conversion formula.

1. No Data on I2C Bus:

   • Ensure the SDA and SCL lines are properly connected.
   • Verify the I2C address matches the module's configuration.
   • Check for loose connections or damaged wires.

2. Inaccurate Readings:

   • Ensure the current-carrying wire is properly aligned with the sensor.
   • Verify the module is operating within the specified temperature range.
   • Minimize electrical noise by using proper shielding and grounding.

3. Module Not Powering On:

   • Confirm the power supply voltage is within the 3.3V to 5V range.
   • Check the mikroBUS™ socket connections for proper alignment.

Q1: Can the module measure both AC and DC currents?
A1: Yes, the PWR Meter 3 Click can measure both AC and DC currents within the ±90A range.

Q2: What is the resolution of the current measurement?
A2: The module provides a 16-bit resolution for precise current measurements.

Q3: Can I use this module with a 5V microcontroller?
A3: Yes, the module supports both 3.3V and 5V logic levels, making it compatible with most microcontrollers.

Q4: How do I change the I2C address?
A4: Refer to the module's datasheet for instructions on configuring the I2C address using onboard jumpers or software commands.

Q5: Is the module suitable for high-frequency current measurements?
A5: The module is designed for general-purpose power monitoring. For high-frequency applications, additional filtering may be required.