【Arduino】168种传感器模块系列实验（158）---QMC5883L三轴罗盘

   【Arduino】168种传感器模块系列实验（资料代码+图形编程+仿真编程）
   实验一百五十八：QMC5883L电子指南针罗盘模块 三轴磁场传感器GY-271
   项目十二：使用简单的代码扫描三轴磁场传感器GY-271的 I2C 地址

  实验开源代码

/*
   【Arduino】168种传感器模块系列实验（资料代码+图形编程+仿真编程）
   实验一百五十八：QMC5883L电子指南针罗盘模块 三轴磁场传感器GY-271
   项目十二：使用简单的代码扫描三轴磁场传感器GY-271的 I2C 地址
   实验接线：
   5883L-------------- UNO
   VCC------------------- 5V
   GND------------------- GND
   SCL ------------------- A5
   SDA------------------- A4
   DRDY------------------ N/C
*/

#include <Wire.h> //include Wire.h library

void setup()
{
  Wire.begin(); // Wire communication begin
  Serial.begin(9600); // The baudrate of Serial monitor is set in 9600
  while (!Serial); // Waiting for Serial Monitor
  Serial.println("\nI2C Scanner");
}

void loop()
{
  byte error, address; //variable for error and I2C address
  int nDevices;

  Serial.println("Scanning...");

  nDevices = 0;
  for (address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);
      Serial.println("  !");
      nDevices++;
    }
    else if (error == 4)
    {
      Serial.print("Unknown error at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.println(address, HEX);
    }
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");

  delay(5000); // wait 5 seconds for the next I2C scan
}
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实验串口返回情况

   【Arduino】168种传感器模块系列实验（资料代码+图形编程+仿真编程）
   实验一百五十八：QMC5883L电子指南针罗盘模块 三轴磁场传感器GY-271
   项目十三：尝试不使用驱动库来读取XYZ

  实验开源代码

/*
   【Arduino】168种传感器模块系列实验（资料代码+图形编程+仿真编程）
   实验一百五十八：QMC5883L电子指南针罗盘模块 三轴磁场传感器GY-271
   项目十三：尝试不使用驱动库来读取XYZ
   实验接线：
   5883L-------------- UNO
   VCC------------------- 5V
   GND------------------- GND
   SCL ------------------- A5
   SDA------------------- A4
   DRDY------------------ N/C
*/


#include <Wire.h> //I2C Arduino Library

#define HMC5883L_ADDR 0x0D //0011110b, I2C 7bit address of HMC5883

bool haveHMC5883L = false;

bool detectHMC5883L ()
{
  // read identification registers
  Wire.beginTransmission(HMC5883L_ADDR); //open communication with HMC5883
  Wire.write(10); //select Identification register A
  Wire.endTransmission();
  Wire.requestFrom(HMC5883L_ADDR, 3);
  if(3 == Wire.available()) {
    char a = Wire.read();
    char b = Wire.read();
    char c = Wire.read();
    if(a == 'H' && b == '4' && c == '3')
      return true;
  }

  return false;
}

void setup()
{
  //Initialize Serial and I2C communications
  Serial.begin(9600);
  Serial.println("GY271 TEST");
  Wire.begin();
  // lower I2C clock http://www.gammon.com.au/forum/?id=10896
  TWBR = 78;  // 25 kHz 
  TWSR |= _BV (TWPS0);  // change prescaler  
}

void loop()
{
  bool detect = detectHMC5883L();

  if(!haveHMC5883L) 
  {
    if(detect) 
    {
      haveHMC5883L = true;
      Serial.println("We have HMC5883L, moving on");
      // Put the HMC5883 IC into the correct operating mode
      Wire.beginTransmission(HMC5883L_ADDR); //open communication with HMC5883
      Wire.write(0x02); //select mode register
      Wire.write(0x00); //continuous measurement mode
      Wire.endTransmission();
    }
    else
    {  
      Serial.println("No HMC5883L detected!");
      delay(2000);
      return;
    }
  }
  else
  {
    if(!detect) {
      haveHMC5883L = false;
      Serial.println("Lost connection to HMC5883L!");
      delay(2000);
      return;
    }
  }
  
  int x,y,z; //triple axis data

  //Tell the HMC5883 where to begin reading data
  Wire.beginTransmission(HMC5883L_ADDR);
  Wire.write(0x0D); //select register 3, X MSB register
  Wire.endTransmission();

 //Read data from each axis, 2 registers per axis
  Wire.requestFrom(HMC5883L_ADDR, 6);
  if(6<=Wire.available()){
    x = Wire.read()<<8; //X msb
    x |= Wire.read(); //X lsb
    z = Wire.read()<<8; //Z msb
    z |= Wire.read(); //Z lsb
    y = Wire.read()<<8; //Y msb
    y |= Wire.read(); //Y lsb
  }
  
  //Print out values of each axis
  Serial.print("x: ");
  Serial.print(x);
  Serial.print("  y: ");
  Serial.print(y);
  Serial.print("  z: ");
  Serial.println(z);
  
  delay(250);
}
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实验串口返回情况（未能识别国产芯片）

   【Arduino】168种传感器模块系列实验（资料代码+图形编程+仿真编程）
   实验一百五十八：QMC5883L电子指南针罗盘模块 三轴磁场传感器GY-271
   项目十四：QMC5883LCompass三轴磁力计罗盘传感器

  实验开源代码

/*
   【Arduino】168种传感器模块系列实验（资料代码+图形编程+仿真编程）
   实验一百五十八：QMC5883L电子指南针罗盘模块 三轴磁场传感器GY-271
   项目十四：QMC5883LCompass三轴磁力计罗盘传感器
   实验接线：
   5883L-------------- UNO
   VCC------------------- 5V
   GND------------------- GND
   SCL ------------------- A5
   SDA------------------- A4
   DRDY------------------ N/C
*/

#include <QMC5883LCompass.h>
QMC5883LCompass compass;

void setup(void) {
  // start serial port
  Serial.begin(115200);
  Serial.println("\n\n\nQMC5883 磁力计测试");
  Serial.println("");
  
  compass.init(); 
}

void loop() {
int x, y, z, a, b;
  char myArray[3];
  
  compass.read();
  
  x = compass.getX();
  y = compass.getY();
  z = compass.getZ();
  a = compass.getAzimuth();
  b = compass.getBearing(a);
  compass.getDirection(myArray, a);
    
  Serial.print("X: ");
  Serial.print(x);

  Serial.print(" Y: ");
  Serial.print(y);

  Serial.print(" Z: ");
  Serial.print(z);

  Serial.print(" 方位角: ");
  Serial.print(a);

  Serial.print(" 方位: ");
  Serial.print(b);

  Serial.print(" 方向: ");
  Serial.print(myArray[0]);
  Serial.print(myArray[1]);
  Serial.print(myArray[2]);
  Serial.println();
  delay(500);
}
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实验串口返回情况

实验串口绘图器返回情况

  实验场景图