Compass

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[[File:CompassBreadboard.jpg|600px]]
 
[[File:CompassBreadboard.jpg|600px]]
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''Breadboard with Compass module and Boarduino, calibration button with indicator, FTDI serial out connected.''
 
''Breadboard with Compass module and Boarduino, calibration button with indicator, FTDI serial out connected.''
  

Revision as of 00:17, 17 December 2013

CompassBreadboard.jpg

Breadboard with Compass module and Boarduino, calibration button with indicator, FTDI serial out connected.

Components

CMPS03.jpg
DC-Boarduino.jpg
OLED-96x64.jpg
FTDI-USB.jpg

Other potential components

Code

The following will give a compass heading via serial monitor

/*
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);
}
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