View source for MAG3110 electronic compass module three axis magnetic sensor magnetometer

= Introduction =

[[File:MAGSensorA.png|640px]]

[[File:MAGSensorB.png|640px]]

MAG3110 is a small, low -power digital 3D magnetic sensor with wide dynamic range , capable of operating in a PCB with high external magnetic field. The sensor device can be used in combination with the sensor which has triaxial accelerometer to produce accurate way navigation information . It uses a standard IIC output interface and smart embedded features , capable of measuring up to 10 gauss local magnetic field , the output data rates up to 80Hz.

= Feature =

*Voltage: 3.3-5V

*Output data rates up to 80Hz

*Standard IIC interface , Under fast mode ,rates up to 400Hz

*Low power, single measurement mode

= Application Ideas =

*Electronic compass

*Location Information Service

= Schematic =

[[File:MAGSensor.png|640px]]

= Interface function =

Interface pin description

[[File:MAGSensor1.jpg|640px]]

= Usage =

'''Hardware：'''

1 x Arduino UNO           

1 x Linker Base Shield       

4 x Dupont line           

1 x MAG3110             

'''Wiring Diagram：'''

Arduino         MAG3110

5V        -->	VCC

GND       -->	GND

SDA (A4)  -->   SDA

SCL (A5)  -->	SCL

[[File:MAGSensor2.png|640px]]

Test Code：

 #include <Wire.h>
 #define MAG_ADDR  0x0E //7-bit address for the MAG3110, doesn't change
 void setup()
 {
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
  config();            // turn the MAG3110 on
 }
 void loop()
 {
  print_values();
  delay(5);
 }
 void config(void)
 {
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x11);              // cntrl register2
  Wire.write(0x80);              // send 0x80, enable auto resets
  Wire.endTransmission();       // stop transmitting
  delay(15);
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x10);              // cntrl register1
  Wire.write(1);                 // send 0x01, active mode
  Wire.endTransmission();       // stop transmitting
 }
 void print_values(void)
 {
  Serial.print("x=");
  Serial.print(readx()); 
  Serial.print(",");  
  Serial.print("y=");    
  Serial.print(ready());
  Serial.print(",");       
  Serial.print("z=");    
  Serial.println(readz());      
 }
 int readx(void)
 {
  int xl, xh;  //define the MSB and LSB
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x01);              // x MSB reg
  Wire.endTransmission();       // stop transmitting
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    xh = Wire.read(); // receive the byte
  }
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x02);              // x LSB reg
  Wire.endTransmission();       // stop transmitting
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    xl = Wire.read(); // receive the byte
  }
  int xout = (xl|(xh << 8)); //concatenate the MSB and LSB
  return xout;
 }
 int ready(void)
 {
  int yl, yh;  //define the MSB and LSB
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x03);              // y MSB reg
  Wire.endTransmission();       // stop transmitting
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    yh = Wire.read(); // receive the byte
  }
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x04);              // y LSB reg
  Wire.endTransmission();       // stop transmitting
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    yl = Wire.read(); // receive the byte
  }
  int yout = (yl|(yh << 8)); //concatenate the MSB and LSB
  return yout;
 }

 int readz(void)
 {
  int zl, zh;  //define the MSB and LSB
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x05);              // z MSB reg
  Wire.endTransmission();       // stop transmitting
 
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    zh = Wire.read(); // receive the byte
  }
  
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  
  Wire.beginTransmission(MAG_ADDR); // transmit to device 0x0E
  Wire.write(0x06);              // z LSB reg
  Wire.endTransmission();       // stop transmitting
  delayMicroseconds(2); //needs at least 1.3us free time between start and stop
  Wire.requestFrom(MAG_ADDR, 1); // request 1 byte
  while(Wire.available())    // slave may send less than requested
  { 
    zl = Wire.read(); // receive the byte
  }
  int zout = (zl|(zh << 8)); //concatenate the MSB and LSB
  return zout;
 }

Test Runs：
（1）Copy the code into the ArduinoIDE, and select the upper left corner of the compile button to compile, as shown below：

[[File:MAGSensor3.png|640px]]

(2)Next, click “Tools->Board” to select the model of the development board and pair serial number, we select AVRISP mkll at here, found from the Device Manager for the serial port COM7. As shown below:

[[File:MAGSensor4.png|640px]]

(3)After completing the above steps , upload code to the Arduino UNO , when the lower left corner of ArduinoIDE display “Done uploading”, open the serial monitor , set the baud rate ( 9600 ) , you can see the data return from MAG3110:

[[File:MAGSensor5.png|640px]]

[[File:MAGSensor6.png|640px]]

= Documents =

[https://s3.amazonaws.com/linksprite/MAG3110+Sensor/MAG3110+Datasheet.pdf MAG3110 Datasheet.pdf]

[https://s3.amazonaws.com/linksprite/MAG3110+Sensor/MAG3110+Schematic.pdf MAG3110 Schematic.pdf]

[https://s3.amazonaws.com/linksprite/MAG3110+Sensor/Simplecode.rar Simplecode.rar]