Interfacing w/ Software on the Computer
HMC6352 not accurate
Topic: HMC6352 not accurate
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HMC6352 not accurate
Feb 20, 2011, 11:40 pm
I have been battling with the programing of the compass HMC6352 to get accurate reading but so far all what I have done has not work...
Well I am using arduino UNO atmega328P. see below the code I used.
while I upload the code, I have readings but the problem comes when I rotate the compass 90degrees. the resulting indication on the serial monitor does not reflect the same 90degrees. I would like to calibrate and I wrote the code for calibration with which I tested the compass once more. but no change.
can anyone lead me or provide me with the calibration code... or anything that will help me move forward...
//LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // initialize the numbers of the interface pins
int compass_address = 0x42; // initialization of the address of the compass
int slave_address, i, current_value, heading_value; // declaration of variables
byte heading_data; // declaration of heading_data as array
slave_address = compass_address >> 1; // this shift the bit right one position results in 0x21 as the address to pass to TWI
Serial.begin(9600); // determine the speed of data transmission
// set up
CLKPR = (1<<CLKPCE);
CLKPR = 0;
// lcd.begin(16, 4); // set the LCD's number of columns and rows
// lcd.setCursor(0, 0); // set the cursor to column 0 and line 1
// lcd.print("Robot heading"); // Print a message to the LCD
Wire.beginTransmission(slave_address); // start of data transmission
Wire.send("A"); // get current data
Wire.endTransmission(); // end of data transmission
delay(100); // delay of 1s before refreshing the data
Wire.requestFrom(slave_address, 2); // request the 2 bytes heading of 8 bits each
i = 0;
while(Wire.available() && i < 2)
heading_data = Wire.receive();
heading_value = (heading_data*256 + heading_data); // add the first byte (MSB) and second byte (LSB)
current_value = heading_value/10;
// lcd.setCursor(0, 1);
// Serial.setCursor(7, 1);
delay(100); // only 70 microseconds are necessary
Seattle, WA USA
Re: HMC6352 not accurate
Feb 21, 2011, 11:33 am
What's up with the poll? I wanted to vote s (for stupid) but that's not a choice.
The art of getting good answers lies in asking good questions.