SKU__SEN0183_CMPS11_-_Tilt_Compensated_Compass_Module-DFRobot

SEN0183 Tilt Compensated Magnetic Compass (CMPS12)

How to use

The CMPS has two interfaces: IIC and Serial mode.

For specific information, please go to the Official website:

IIC mode

Serial mode

Here, we will try the IIC mode on Arduino UNO.

Diagram

SEN0183 Tilt Compensated Magnetic Compass (CMPS12) Diagram

Sketch

Copy the sketch into the arduino IDE, and upload.

    /*************
    This sketch is revised by LEFF in DFRobot, based on the official one with
    LCD05 display @ http://www.robot-electronics.co.uk/files/arduino_cmps10.ino
    *************/

    #include <Wire.h>

    #define ADDRESS 0x60                                          // Defines address of CMPS10

    void setup(){
      Serial.begin(9600);
      Wire.begin();                                               // Conects I2C
    }

    void loop(){
      byte highByte, lowByte, fine;              // highByte and lowByte store high and low bytes of the bearing and fine stores decimal place of bearing
      char pitch, roll;                          // Stores pitch and roll values of CMPS10, chars are used because they support signed value
      int bearing;                               // Stores full bearing

      Wire.beginTransmission(ADDRESS);           //starts communication with CMPS10
      Wire.write(2);                              //Sends the register we wish to start reading from
      Wire.endTransmission();

      Wire.requestFrom(ADDRESS, 4);              // Request 4 bytes from CMPS10
      while(Wire.available() < 4);               // Wait for bytes to become available
      highByte = Wire.read();
      lowByte = Wire.read();
      pitch = Wire.read();
      roll = Wire.read();

      bearing = ((highByte<<8)+lowByte)/10;      // Calculate full bearing
      fine = ((highByte<<8)+lowByte)%10;         // Calculate decimal place of bearing

      display_data(bearing, fine, pitch, roll);  // Display data to the Serial
      delay(500);
    }

    void display_data(int b, int f, int p, int r){    // pitch and roll (p, r) are recieved as ints instead oif bytes so that they will display corectly as signed values.

      Serial.print("CMPS10 Example V:");
      Serial.println(soft_ver());                        // Display software version of the CMPS10

      delay(5);                                       // Delay to allow Serial to proscess data

      Serial.print("Bearing = ");                      // Display the full bearing and fine bearing seperated by a decimal poin on the Serial
      Serial.print(b);
      Serial.print(".");
      Serial.println(f);

      delay(5);

      Serial.print("Pitch = ");
      Serial.println(p);

      delay(5);

      Serial.print("Roll = ");
      Serial.println(r);
    }

    int soft_ver(){
      int data;                                      // Software version of  CMPS10 is read into data and then returned

      Wire.beginTransmission(ADDRESS);
      // Values of 0 being sent with write need to be masked as a byte so they are not misinterpreted as NULL this is a bug in arduino 1.0
      Wire.write((byte)0);                           // Sends the register we wish to start reading from
      Wire.endTransmission();

      Wire.requestFrom(ADDRESS, 1);                  // Request byte from CMPS10
      while(Wire.available() < 1);
      data = Wire.read();

      return(data);
    }
SEN0183 Tilt Compensated Magnetic Compass (CMPS12)

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