Arduino + GY-273 HMC5883L 電子指南針

GY-273 HMC5883L code:

GY-273 HMC5883L /  arduino

Vcc : 3.3v
GND : GND
SCL : 5A
SDA : 4A
DRDY : N/A

/* Include the standard Wire library */
#include <Wire.h>

/* The I2C address of the module */
#define HMC5803L_Address 0x1E

/* Register address for the X Y and Z data */
#define X 3
#define Y 7
#define Z 5

void setup()
{
  Serial.begin(9600);
  /* Initialise the Wire library */
  Wire.begin();

  /* Initialise the module */
  Init_HMC5803L();
}

void loop()
{
  /* Read each sensor axis data and output to the serial port */
  Serial.print(HMC5803L_Read(X));
  Serial.print(" ");
  Serial.print(HMC5803L_Read(Y));
  Serial.print(" ");
  Serial.println(HMC5803L_Read(Z));

  /* Wait a little before reading again */
  delay(200);
}


/* This function will initialise the module and only needs to be run once
   after the module is first powered up or reset */
void Init_HMC5803L(void)
{
  /* Set the module to 8x averaging and 15Hz measurement rate */
  Wire.beginTransmission(HMC5803L_Address);
  Wire.write(0x00);
  Wire.write(0x70);
         
  /* Set a gain of 5 */
  Wire.write(0x01);
  Wire.write(0xA0);
  Wire.endTransmission();
}


/* This function will read once from one of the 3 axis data registers
and return the 16 bit signed result. */
int HMC5803L_Read(byte Axis)
{
  int Result;

  /* Initiate a single measurement */
  Wire.beginTransmission(HMC5803L_Address);
  Wire.write(0x02);
  Wire.write(0x01);
  Wire.endTransmission();
  delay(6);

  /* Move modules the resiger pointer to one of the axis data registers */
  Wire.beginTransmission(HMC5803L_Address);
  Wire.write(Axis);
  Wire.endTransmission();
 
  /* Read the data from registers (there are two 8 bit registers for each axis) */
  Wire.requestFrom(HMC5803L_Address, 2);
  Result = Wire.read() << 8;
  Result |= Wire.read();

  return Result;
}

 GY-273 HMC5883L 零件圖:

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