How to Use RAK16000 WisBlock DC Current Module: Examples, Pinouts, and Specs

The RAK16000 WisBlock DC Current Module is a compact and versatile module designed to measure direct current (DC) in a wide range of applications. It provides accurate current readings, making it ideal for monitoring and control in electronic circuits. This module is part of the WisBlock ecosystem, which allows for seamless integration with other WisBlock modules and baseboards.

• Battery monitoring in IoT devices
• Power consumption measurement in embedded systems
• Current sensing in renewable energy systems
• Industrial automation and control
• Electric vehicle (EV) current monitoring

The RAK16000 module is built to deliver precise current measurements while maintaining ease of use. Below are its key technical details:

The RAK16000 module connects to the WisBlock Baseboard via the standard WisBlock interface. Below is the pin configuration:

The RAK16000 module is easy to integrate into your project. Follow the steps below to use it effectively:

1. Connect the Module to the WisBlock Baseboard:
   • Attach the RAK16000 module to the WisBlock Baseboard using the designated slot.
2. Connect the Current Path:
   • Connect the positive side of the load to the IN+ pin and the negative side to the IN- pin.
3. Power the Module:
   • Ensure the WisBlock Baseboard is powered with a 3.3V or 5V supply.
4. Establish I2C Communication:
   • Connect the SDA and SCL pins to the I2C bus of your microcontroller or WisBlock Core module.

• Current Range: Ensure the current flowing through the module does not exceed ±5A to avoid damage.
• I2C Address: The default I2C address of the RAK16000 is 0x40. Verify that no other devices on the I2C bus share the same address.
• Calibration: For precise measurements, calibrate the module as per your application requirements.
• Noise Reduction: Use proper decoupling capacitors and shielded cables to minimize noise in high-current applications.

The RAK16000 can be interfaced with an Arduino UNO using the I2C protocol. Below is an example code snippet:

#include <Wire.h>

// Define the I2C address of the RAK16000 module
#define RAK16000_I2C_ADDRESS 0x40

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(9600);
  
  // Initialize the I2C communication
  Wire.begin();
  
  Serial.println("RAK16000 DC Current Module Initialized");
}

void loop() {
  // Request 2 bytes of data from the RAK16000 module
  Wire.beginTransmission(RAK16000_I2C_ADDRESS);
  Wire.write(0x00); // Command to read current data
  Wire.endTransmission();
  
  Wire.requestFrom(RAK16000_I2C_ADDRESS, 2);
  
  if (Wire.available() == 2) {
    // Read the two bytes of current data
    uint8_t msb = Wire.read();
    uint8_t lsb = Wire.read();
    
    // Combine the bytes into a 16-bit value
    int16_t currentRaw = (msb << 8) | lsb;
    
    // Convert the raw value to current in amperes
    float current = currentRaw * 0.001; // Assuming 1mA resolution
    
    // Print the current value
    Serial.print("Current: ");
    Serial.print(current);
    Serial.println(" A");
  }
  
  delay(1000); // Wait for 1 second before the next reading
}

1. No Data from the Module:

   • Cause: Incorrect I2C address or wiring.
   • Solution: Verify the I2C address and ensure proper connections for SDA and SCL.

2. Inaccurate Current Readings:

   • Cause: Calibration not performed or excessive noise in the circuit.
   • Solution: Perform calibration and use proper shielding and decoupling techniques.

3. Module Overheating:

   • Cause: Current exceeding the ±5A limit.
   • Solution: Ensure the current through the module is within the specified range.

4. I2C Communication Errors:

   • Cause: Conflicts with other devices on the I2C bus.
   • Solution: Check for address conflicts and ensure proper pull-up resistors are used.

Q1: Can the RAK16000 measure AC current?
A1: No, the RAK16000 is designed specifically for DC current measurement.

Q2: What is the resolution of the current measurement?
A2: The module provides a 12-bit resolution, allowing for precise current readings.

Q3: Can I use the RAK16000 with a 5V microcontroller?
A3: Yes, the module supports both 3.3V and 5V logic levels.

Q4: How do I change the I2C address of the module?
A4: The I2C address is fixed at 0x40 and cannot be changed.

By following this documentation, you can effectively integrate the RAK16000 WisBlock DC Current Module into your projects for accurate and reliable current measurements.