Low-Cost Digital Compass Module (Itead IM120712009) UART, IIC with external controler like Arduino, IFLAT32

Overview

This is a low cost digital compass with UART and IIC interface, it's easy to use with external controler like Arduino,IFLAT32.

Features

• Small size
• Uart or IIC doulbe output/control interface
• 3-5V Voltage comaptible

Serial Communication Protocol

Baud rate: 9600 bps Parity: N data bits: 8 Stop bit: 1

Command

• 0x31: the first angle measurement
• 0xC0: calibration of the magnetic field start
• 0xC1: the end of the calibration magnetic field
• 0xA0-0XAA-0XA5-0XC5: Restore default setting
• 0xA0-0XAA-0XA5-IIC_ADDR: IIC address of the module change
• 0x03 + 8bit:  Setting the magnetic declination high 8 bit
• 0x04 + 8bit:  Setting the magnetic declination low8 bit

Documents

Please visit our wiki page for more info about this product. It will be appreciated if you can help us improve the documents by correcting the errors, adding more demo codes or tutorials.

Technical support

For technical support, please open a ticket on Itead Support System.

Measuring range	0-360 °
Resolution	0.1
Accuracy	1°
Power supply	3V-5V DC
Frequency response	25Hz
Current	5 V--15mA 3V--8 mA
Size	25.6mm×25.6mm

Serial Communication Protocol

Baud rate:

9600 bps Parity: N data bits: 8 Stop bit: 1

Command

0x31: the first angle measurement 0xC0: calibration of the magnetic field start 0xC1: the end of the calibration magnetic field 0xA0-0XAA-0XA5-0XC5: Restore default setting 0xA0-0XAA-0XA5-IIC_ADDR: IIC address of the module change 0x03 + 8bit: Setting the magnetic declination high 8 bit 0x04 + 8bit: Setting the magnetic declination low8 bit

Return Data

Byte0: 0x0D Byte1: 0x0A Byte2: 0x30 ~ 0x33 angle of one hundred (ASCII 0 ~ 3) Byte3: 0x30 ~ 0x39 angle of ten (ASCII 0 ~ 9) Byte4: 0x30 ~ 0x39 angle a bit (ASCII 0 ~ 9) Byte5: 0x2E (ASCII code decimal point) Byte6: 0x30 ~ 0x39 decimal point (ASCII 0 ~ 9) Byte7: 0x00 ~ 0xFF checksum (only lower 8bit)

You can use the Foca or USBtoTLL moudle to connect your PC with this moudle.

IIC Communication Protocol:

The IIC communication, the module is equivalent to 24C04, EEPROM memory. And you can read the different address to get the information you need.

Address	Data
0x00	-
0x01	Angle value high 8bit
0x02	Angle value low 8bit
0x03	Magnetic declination high 8bit
0x04	Magnetic declination low 8bit
0x05	-
0x06	-
0x07	Calibration Level

IIC command:

Command	Description
0x00+0x31	Angle measurement
0x00+0xC0	Start calibration
0x00+0xC1	Stop calibration
0x00+0xA0+0XAA+0XA5+0XC5	Restore default setting
0x00+（0xA0+0XAA+0XA5+IIC_ADDR）	Change IIC address of the module
0x03+ 8bit	Magnetic declination changes (high 8bit)
0x04+ 8bit	Magnetic declination changes (low 8bit)

• Default IIC address is 0xE0.

Download

Datasheet