Difference between revisions of "Low-cost Digital Compass Module"

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(→‎Serial Communication Protocol)
(→‎IIC Communication Protocol:)
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==IIC Communication Protocol:==
 
==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.
 +
 +
{| class="wikitable"
 +
|-
 +
| align="center" style="background:#f0f0f0;"|'''Address'''
 +
| align="center" style="background:#f0f0f0;"|'''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:===
 +
{| class="wikitable"
 +
|-
 +
| align="center" style="background:#f0f0f0;"|'''Command'''
 +
| align="center" style="background:#f0f0f0;"|'''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==
 
==Download==
  
 
==Useful Links==
 
==Useful Links==

Revision as of 09:25, 29 May 2014

Overview

LOW-COST DIGITAL COMPASS MODULE.jpg

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

Specifications

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

Hardware

LOW-COST DIGITAL COMPASS MODULE1.jpg

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

Useful Links

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