MAG3110 electronic compass module three axis magnetic sensor magnetometer
Introduction
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
Interface function
Interface pin description
Usage
Hardware：
Arduino UNO x1
Linker Base Shield x1
Dupont line x4
MAG3110 x1
Wiring Diagram：
Arduino MAG3110
5V --> VCC
GND --> GND
SDA (A4) --> SDA
SCL (A5) --> SCL
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：
(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:
(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:
