Compass

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(Components)
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== Components ==
 
== Components ==
 +
[[File:CMPS03.jpg|thumb]]
 
[[File:DC-Boarduino.jpg|thumb]]
 
[[File:DC-Boarduino.jpg|thumb]]
 
[[File:OLED-96x64.jpg|thumb]]
 
[[File:OLED-96x64.jpg|thumb]]
 
[[File:FTDI-USB.jpg|thumb]]
 
[[File:FTDI-USB.jpg|thumb]]
[[File:CMPS03.jpg|thumb]]
+
 
 
* Compass Module CMPS03 http://www.robot-electronics.co.uk/htm/cmps3tech.htm
 
* Compass Module CMPS03 http://www.robot-electronics.co.uk/htm/cmps3tech.htm
 
* DC Boarduino http://learn.adafruit.com/boarduino-kits/dc-parts-list
 
* DC Boarduino http://learn.adafruit.com/boarduino-kits/dc-parts-list
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* 0.96" OLED Display https://www.adafruit.com/products/684
 
* 0.96" OLED Display https://www.adafruit.com/products/684
 
* FTDI/USB http://www.parallax.com/catalog/integrated-circuits/ftdi
 
* FTDI/USB http://www.parallax.com/catalog/integrated-circuits/ftdi
 
  
 
== Code ==
 
== Code ==

Revision as of 23:29, 16 December 2013

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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