CMPS03 Compass Module

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CMPS03

Compass Module

CMPS03 connector description

This module used I2C as a protocol to communicate with MCU and use 5V for power supply.

Data from I2C is compass Bearing as a word, i.e. 0-3599 for a full circle, representing 0-359.9 degrees.

Sample Code:
/*
CMPS03 with arduino I2C example

This will display a value of 0 - 359 for a full rotation of the compass.

The SDA line is on analog pin 4 of the arduino and is connected to pin 3 of the CMPS03.
The SCL line is on analog pin 5 of the arduino and is conected to pin 2 of the CMPS03.
Both SDA and SCL are also connected to the +5v via a couple of 1k8 resistors.
A switch to callibrate the CMPS03 can be connected between pin 6 of the CMPS03 and the ground.
*/

#include <wire .h>

#define ADDRESS 0x60 //defines address of compass

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

void loop(){
  byte highByte;
  byte lowByte;
  
   Wire.beginTransmission(ADDRESS);      //starts communication with cmps03
   Wire.write(2);                         //Sends the register we wish to read
   Wire.endTransmission();

   Wire.requestFrom(ADDRESS, 2);        //requests high byte
   while(Wire.available() < 2);         //while there is a byte to receive
   highByte = Wire.read();           //reads the byte as an integer
   lowByte = Wire.read();
   int bearing =((highByte<<8)+lowByte)/10; 
   
   Serial.println(bearing);
   delay(100);
}

This code will get a data from module via I2C communication about degrees from 0-359.9 degrees for compass and print output to serial port. (0 is North)

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