Home Code Raspberry Pi MAG3110 magnetometer example

Raspberry Pi MAG3110 magnetometer example

by shedboy71

Freescale’s MAG3110 is a small, low-power, digital 3-axis magnetometer. The device can be used in conjunction with a 3-axis accelerometer to realize an orientation independent electronic compass that can provide accurate heading information. It features a standard I2C serial interface output and smart embedded functions.

The MAG3110 is capable of measuring magnetic fields with an output data rate (ODR) up to 80 Hz; these output data rates correspond to sample intervals from 12.5 ms to several seconds. The MAG3110 is available in a plastic DFN package and it is guaranteed to operate over the extended temperature range of -40°C to +85°C.

Again for ease to use its easier to buy a module with the device fitted to it, here is one that I purchased. You can see the MAG3110 in the middle of the picture

mag3110-module

I also found this schematic online of a similar module to the one pictured above. Looking at the schematic it looks very similar to the module

magsensor-module-schematic

 

Connection

Raspberry Pi Pin MAG3110 Pin
3v3 VCC
GND GND
D3 SDA
D5 SCL

Layout

An I2C device so easy to wire up as per the connections above

pi-and-mag3110_bb

Code

 

 

Save the following code as mag3110.py

import smbus
import time
 
bus = smbus.SMBus(1)
 
# MAG3110 I2C address 0x0E
# Select Control register, 0x10(16)
bus.write_byte_data(0x0E, 0x10, 0x01)
 
time.sleep(0.5)
 
# MAG3110 I2C address 0x0E
# Read data back from 0x01(1), 6 bytes
data = bus.read_i2c_block_data(0x0E, 0x01, 6)
 
# Convert the data
xMag = data[0] * 256 + data[1]
if xMag > 32767 :
	xMag -= 65536
 
yMag = data[2] * 256 + data[3]
if yMag > 32767 :
	yMag -= 65536
 
zMag = data[4] * 256 + data[5]
if zMag > 32767 :
	zMag -= 65536
 
# Output data
print "X-Axis : %d" %xMag
print "Y-Axis : %d" %yMag
print "Z-Axis : %d" %zMag

Testing

 

Run the code above – sudo python mag3110.py

pi-and-mag3110-output

 

Link
MAG3110 compass module three-axis electronic compass module magnetoresistive sensor magnetometer module

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