HMC1022 Digital Compass

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1 Key Features Based on Honeywell s HMC1022 solid-state magnetic sensor Choice of 2 Interface Options (UART/I2C) Standard Pin Headers come soldered Plug and Play Module SPECIFICATIONs Angular Measuring Range 0 to 360 Resolution 0.1 Update Rate 30Hz Angular Repeatability 1 Accuracy ± 1 Operating Voltage Range UART: 3.3V/5V DC; I2C: 5V DC Operation Current Consumption 3.3V 5V Operating Temperature -20 C to 85 C Storage Temperature -40 C to 125 C Dimension 25.6 mm (W)* 25.6 mm (L) PINOUT

2 UART/ SERIAL INTERFACE CONNECTION *Interface cable is a ZH1.5 JST 5 way connector (sold separately). *Note: The module can be powered up using a voltage range of both 3.3V and 5V when using this mode.

3 Uart /Serial Communication protocol UART Fixed Baud Rate Settings: 9600bps, 8bit Data, 1 Stop Bit, No Parity, No Flow Control The HMC1022 Digital Compass accepts the following commands. Commands (Hex) Description 0x31 Get Angular Measurement 0xC0 Start Calibration 0xC1 End Calibration 0xA0 0xAA 0xA5 0xC5 Reset Module to Factory Default 0xA0 0xAA 0xA5 I2C_ADDR Change Module s I2C Address* 0x03 + 8bit Data (High) Set Magnetic Declination (High Byte) 0x04 + 8bit Data (Low) Set Magnetic Declination (Low Byte) *Default I2C address is 0XE0. Module response The HMC1022 Digital Compass responds to commands using the following package. 8 bytes per package; ASCII Format Package Format Byte 0 Byte 1 Byte 2 Byte 6 Byte 7 CrLf (New Line) Data Checksum Package Details Byte Response (Hex) Response (ASCII equivalent) Description 0 0x0D CR (Carriage Return) Part of New Line (CR + LF = New Line) 1 0x0A LF (Line Feed) Part of New Line (CR + LF = New Line) 2 0x30 ~ 0x33 0 ~ 3 Angle Value (Hundreds; 100s) 3 0x30 ~ 0x39 0 ~ 9 Angle Value (Tens; 10s) 4 0x30 ~ 0x39 0 ~ 9 Angle Value (Units; 1s) 5 0x2E. Period/ Decimal Point 6 0x30 ~ 0x39 0 ~ 9 Angle Value (Decimal) 7 0x00 ~ 0xFF Checksum (Sum of Byte 0 to 6) Lower Byte EXAMPLE Getting current angular position from the module; Transmit: <0x31> Receive: <0x0D, 0x0A, 0x33, 0x35, 0x39, 0x2E, 0x36, 0x1C> = Byte 0 Byte 1 Byte 2 Byte 6 Byte 7 Hex 0x0D 0x0A 0x33 0x35 0x39 0x2E 0x36 0x1C ASCII CR LF Desc CrLf (New Line) Data Checksum

4 I2C INTERFACE CONNECTION *Interface cable is a ZH1.5 JST 4 way connector (sold separately). 5V 5V JST2 I2C GND 3.3V SCL / 3 SDA / 4 PORT0 Note: The I2C interface requires the module to be powered up using 5V. This 5V can be tapped from the VCC pin of the BCore if you re providing a 5V power supply. However, please note that if you re using the OLED board together with the BCore, the minimum power supply voltage is 6V. Please tap the 5V from the OLED board instead. Refer to the OLED documentation to locate where the 5V pin out is. I2C communication protocol In I2C mode, the module functions just like the 24C04 EEPROM chip. To obtain the information required, retrieve data from the respective addresses. Address (Hex) Data 0x00-0x01 Angle Value (High Byte) 0x02 Angle Value (Low Byte) 0x03 Magnetic Declination (High Byte) 0x04 Magnetic Declination (Low Byte) 0x05-0x06-0x07 Calibration Level

5 I2C commands Commands (Hex) Description 0x00 + 0x31 Get Angular Measurement 0x00 + 0xC0 Start Calibration 0x00 + 0xC1 End Calibration 0xA0 + 0xAA + 0xA5 + 0xC5 Reset Module to Factory Default 0xA0 + 0xAA + 0xA5 + I2C_ADDR Change Module s I2C Address* 0x03 + 8bit Data Set Magnetic Declination (High Byte) 0x04 + 8bit Data Set Magnetic Declination (Low Byte) *Default I2C address is 0XE0.

6 HMC1022 Notes Digital Compass Latest documentation All of our documentations are constantly updated to provide accurate and/or new information that we feel would help you with developing with our products. The latest documentation may be obtained from our website: How you can help You can help us to improve our documentations by ing to us or posting a thread in our forum, reporting any mistakes/typos or errata that you might spot while reading our documentation. TechSupport@aiscube.com Forum: Disclaimer All information in this documentation is provided as-is without any warranty of any kind. The products produced by are meant for rapid prototyping and experimental usage; they are not intended nor designed for implementation in environments that constitute high risk activities. shall assume no responsibility or liability for any indirect, specific, incidental or consequential damages arising out of the use of this documentation or product. Copyright All rights reserved. All product and corporate names appearing in this documentation may or may not be registered trademarks or copyrights of their respective companies, and are only used for identification or explanation for the owner s benefit, with AIS no intent Cube to infringe. The BlazingCore(BCore) and BCore IDE are trademarks of in Singapore and/or other countries. All images depicting the Blazingcore or any part of it is copyrighted.