Hi,
it seem that I'm able to get the data from the HMC5883L sensor but, the
data is weird. The data would gain an increment of of 1 until it turn fully
90 degree then suddenly jump to another number. Here the code can some1
look over it.
var i2c = require('i2c');
var address_compass = 0x1e;
var wire1 = new i2c(address_compass, {device: '/dev/i2c-1'});
var compassData_X = 0;
var compassData_Y = 0;
var compassData_Z = 0;
var compass;
wire1.writeBytes(0x00, [0x70], function(err) {})
wire1.writeBytes(0x01, [0xA0], function(err) {})
wire1.writeBytes(0x02, [0x00], function(err) {})
setInterval(function(){ wire1.readBytes(0x03, 2, functions(err,res){
compassData_X = res[0] << 8 | res[1] ;
compassData_Z = res[2] << 8 | res[3] ;
compassData_Y = res[4] << 8 | res[5];
console.log("x: " + compassData_X + "y: " + compassData_Y + "z: " +
compassData_X ); */
var declinationAngle = .226; //use in compass functions, value needed
checking with sensor
var pi = 3.14;
var heading = Math.atan2(compassData_Y,compassData_X);
// Once you have your heading, you must then add your 'Declination
Angle', which is the 'Error' of the magnetic field in your location.
//If you cannot find your Declination, comment out this lines, your
compass will be slightly off.
heading += declinationAngle;
// Correct for when signs are reversed.
if(heading < 0)
heading += 2*pi;
// Check for wrap due to addition of declination.
else if(heading > 2*pi )
heading -= 2*pi ;
// Convert radians to degrees for readability.
var headingDegrees = ((heading * 180)/pi);
console.log("x: " + compassData_X + " y: " + compassData_Y + " z: " +
compassData_Z + " uT"); // Display the results
//(magnetic vector values are in micro-Tesla (uT))
console.log('Heading: ' + headingDegrees + ' degrees' );
})}, 1000)
Thank you,
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