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DIGITAL-COMPASS

1. DIGITAL COMPASS RD SILICON LABORATORIES DIGITAL COMPASS REFERENCE DESIGN KIT USER S GUIDE 1 Kit Contents The Digital Compass Reference Design Kit contains the following items e C8051F350 Digital Compass Reference Design Board e Silicon Laboratories Reference Design CD ROM CD content includes the following PC Compass GUI Driver installation utility Documentation e USB Cable e Digital Compass Reference Design Kit User s Guide this document e Two AAA alkaline batteries 2 Introduction The Digital Compass Reference Design Kit combines the performance of Silicon Laboratories MCU s and the latest sensors in magnetic and tilt measuring This reference design offers a high performance and reliable compass solution while demonstrating the ability to interface sensors directly to an MCU 3 Quick Start Guide The Digital Compass Reference Design Board is a fully functional tilt compensated digital compass It can be powered via batteries for stand alone operation or via the USB cable when used in conjunction with the GUI In order to use the compass immediately e Install the two AAA alkaline batteries noting the polarity markings e Press the ENTER button The compass will display a traditional direction heading e g N S E W with absolute information displayed degrees minutes format In addition an arrow and a corresponding N will always point north 4 General Description A compass is a navigational instrume
2. 1 s SILICON LABORATORIES DIGITAL COMPASS RD 6 4 Inclination Choose menu option I and press the ENTER button to select this option Angles of tilt on both X and Y axes will be displayed on the LCD Inclination angles can be measured correctly up to 70 degrees on both axes Beyond this value the degree displayed will be 70 INCLINATION Ib 13 Figure 5 LCD Inclination Mode Display 6 5 Tilt Calibration To calibrate the tilt of the compass put the board in a horizontal position Choose menu option Ct and press the ENTER button to select this option CALIBRATION and INCLINATION segments will appear during the calibration process as shown in Figure 6 Do not tilt or move compass during tilt sensor calibration After tilt calibration the compass will display the inclination angles It is recommended that a tilt calibration should be performed each time tilt angles fluctuate INCLINATION CALRBE RATION Figure 6 LCD Tilt Calibration Mode Display s Rev 0 1 5 SILICON LABORATORIES DIGITAL COMPASS RD 6 6 Calibration To calibrate the compass put the board in a horizontal position Choose menu option C and press the ENTER button to select this option Use the following steps to perform a calibration of the magnetic compass 1 Hold the compass in a perfectly horizontal position The symbols CALIBRATION and TURN will be displayed on the LCD as shown in Figure 7 CALBRATION Figu
3. COM Port Cancel Figure 13 COM Port Selection 4 Press the Start Communication button in the Compass application If the connection is successful the application will begin displaying the Direction Inclination and Temperature calculated by the compass board The display is shown in Figure 14 Ez Silicon Laboratories Compass xl DIRECTION o F e 29 z INCLINATION SILICON LABORATORIES IA JIN m TEMPERATURE e USP Figure 14 Compass Software Display 5 To disconnect from the compass board press the Stop Communication button 10 Rev 0 1 e SILICON LABORATORIES RD DIGITAL COMPASS 9 Schematics uonenje 3 SSVdINOD 0SESLSO8D S e1nDrJ auod dino 615 A n ZMS LY oor NOLLNG 91M in V au9a 090V1WS SA X Sb bl dino IN Ko JO 2 JN Jo 812 gen lt gt N MN on CAM ds aoM Ly IMS 8alo vidao3H asn ae et Nonus un OU ely ONGN 980912 9 QaN9G pe ff gt gt SNIA vas 9 m re s TS i lld V 01 OL 951 2 LM 8 GNSV Ce Ce Kc Xe QN9V 01992 Gone N N Eg 068415089 z lt lt azo anoa Ne aim E Ib Pg out 202 TOO STT STT 55 lt TT tg 709 02 vio Ce Y
4. E xd AE ML lt L TIL S8 Old a oiv 00 AX UMd gt aN9G eS AX 2238029 gt Tund lt FEECH AE aN9v 111 lt lt TL 3181 3981 ano 1 lt x e bb LOLO 19835155 eo DAE al lt gt azo Ne ZH 8942 LA lt xd a lt ZIS DANOV MEE8SLOT 30 1H Addy 30 Addy 010 6 60 80 19 9H N DANDA 31001 A 99 JA 311v8 SSA 5 991 SH gt 9 AIddNS E v2 vM D gt FT ano 9 ori m p eu en HERE ano ep Orig gt m 3dONV V avid 4 94185 V AE zb eng QN9d zn SNdA m P 3001 001 o asn gt Lv V 11 Mr gt ac LABORATORIES SILICON DIGITAL COMPASS RD z uonenje 3 SSvdWoo 05 41S082 9 e1nDrJ 015 LASHAA LAS LU V AE LOEZIS ID Z 4Md aNov QNOV an a any 629 8 820 0000 0 z A NI INO V 820 L9 2W Ln 8Md aNov QNOV an q any 129 029 5000 0 z 2 5 gt pj 1no Ez V AS 820 L9 2W 8n iino Vno 869 162 inveseaxw P ei
5. PC The following sections detail the software installation process and connection options 8 1 Installation Use the following steps to install the compass software and USB drivers 1 Insert the CD ROM into your PC s CD ROM drive An installer will automatically launch allowing you to install the compass software If the installer does not automatically start when you insert the CD ROM run CompassDemolnstall exe found in the root directory of the CD ROM 2 Follow the prompts to install the Compass Software and the CP210x drivers These drivers are necessary for the software to communicate with the board over the USB connection If using Windows XP logo testing warnings may appear Press the Continue Anyway button Connect the compass board to the PC with the included USB cable When the PC detects the new device it will open a Found New Hardware Wizard window Press Next after selecting the Recommended option Windows Logo testing warnings may appear Press the Continue Anyway button Press Finish to finish installing the CP210x USB Composite Device Repeat steps 5 6 and 7 to install the CP210x USB Bridge Controller sm e 8 Rev 0 1 s SILICON LABORATORIES DIGITAL COMPASS RD 8 2 Connection Options Use the following steps to run the compass software and connect to the board 1 Start the compass application by running Compass exe located by default at C SiLabs MCU Demos C8051F 35x Th
6. following is a list of indicators that could be shown on the LCD display See Figure 2 for a diagram of the LCD display with all the segments on a Symbols that are used during the calibration process 1 CALIBRATION calibration routine is in progress 2 ERROR error encountered during calibration process 3 TURN the compass must be turned a full circle d Digits and symbols used for azimuth temperature or inclination display 1 95 digits 2 Degree o and minute symbols used in azimuth display 3 Xand Y symbols used in inclination display 4 Decimal point used for temperature display C Indications that either temperature inclination or azimuth is displayed 1 When neither of them is on the azimuth is displayed 2 When temperature is on the environment temperature is displayed 3 When inclination is on the tilt angles on both X and Y axes is displayed d 16 arrows that indicate the North direction relative to the reference point e Silicon Laboratories logo f 2 digits that indicate the heading or the menu of the compass 2 0 1 s SILICON LABORATORIES DIGITAL COMPASS RD Figure 2 LCD Indicators 5 3 Buttons The MENU and ENTER buttons are located on the board to provide access to the compass menu The following is a short description of these button functions See Section 6 for a more detailed description of the operation of the compass 1 Press MENU SW1 to enter the compass menu Options in menu
7. Display The calibration procedure is now finished and the compass will display the azimuth and the direction If the calibration procedure was not successfully completed e g the compass was not rotated 360 degree the ERROR symbol will be displayed on the LCD meaning that the calibration procedure should be repeated for the compass to work properly s Rev 0 1 7 SILICON LABORATORIES DIGITAL COMPASS RD 7 Declination Angle The compass is calibrated at the Silicon Laboratories factory in Austin Texas but because the angle of declination varies with respect to geographic position the compass must be calibrated again for the specific location of use to achieve maximum accuracy Table 1 provides this information for several major cities around the world Table 1 Angles of Declination for Selected Cities February 2005 Nuremberg Germany There are a number of resources available on the World Wide Web that compute angles of declination for any location in the world A World Magnetic Model Calculator is available from both the National Geophysical Data Center and the British Geological Survey e http Awww ngdc noaa gov seg geomag jsp struts calcDeclination e http www geomag bgs ac uk gifs wmm calc html 8 Compass Software The included CD ROM contains the Silicon Laboratories Compass Software and additional documentation This software allows the user to connect to the compass board and display the information on a
8. are a A displays azimuth information b t displays temperature information displays inclination information d Ct calibration of tilt sensor e C calibration of magnetic sensors Note During the calibration process the MENU button is used to input angle of declination See Section 6 for further details on the calibration process 2 ENTER SW2 has the following functions a Enables the option selected in the menu b If temperature is displayed toggles between Celsius and Fahrenheit degrees During calibration process it is used to save angle of declination Pressing the RESET button will send a reset signal to the C8051F350 device on the board When this occurs all the segments of the LCD display will turn on for a short period of time After reset the compass will display the azimuth mode 5 4 Power The compass solution is a low power device The following are power specifications for the board 1 Supply voltage 3 V lithium battery USB or AC DC adapter max voltage 12 V 2 Supply current average of 18 mA stand by 150 uA 5 5 Power LEDs Two red power LEDS are provided on the compass board The LED labeled USB indicates that the board is receiving power from the USB connection The LED labeled POWER indicates that the board is receiving power from an AC DC adaptor There is no LED indicator for power provided by batteries 6 Rev 0 1 3 SILICON LABORATORIES DIGITAL COMPASS RD 6 Modes Of Op
9. e application is shown in Figure 11 z Silicon Laboratories Compass E Bl Start Communication Select COM Port COM3 Exit N DIRECTION o F A amp E lt e SILICON LABORATORIES i Nf IN mm mm mm 5 s COE 8 Ls LJ CJ 1 C3 Figure 11 Compass Software Startup 2 connect to the board the COM port designated to compass device must be specified To find the correct COM port open the PC s Device Manager window Expand the Ports COM amp LPT section Find the COM port assigned to CP210x USB to UART Bridge Controller An example is shown in Figure 12 G Device Manager E ml x File Acton View Help EP Mice and other pointing devices H E Monitors E Multifunction adapters 9 88 Network adapters Ports COM amp LPT i umm Let 210x USB to UART Bridge Controller COM5 TICE FEM LL QX16PCI952 PCI Parallel port LPT3 E PCI Communications Port COM E PCI Communications Port COM3 H Processors pi Sound video and game controllers 23 System devices Se Universal Serial Bus controllers Figure 12 COM Port in Device Manager s Rev 0 1 9 SILICON LABORATORIES DIGITAL COMPASS RD 3 Once the COM port has been determined press the Select COM Port COM option in the Compass application Enter the correct COM port into the COM Port Selection window shown in Figure 13 x
10. eration 6 1 Power Up When powered from USB battery or AC DC adaptor at power up all the segments of the LCD display will turn on This is an indicator that a normal power up has occurred After power up the compass will display the azimuth mode 6 2 Azimuth The default information that is displayed after each reset power up or calibration is the azimuth If you choose another mode to be displayed and want to return to the azimuth mode choose menu option A and press the ENTER button to select this option The following list along with Figure 3 show the details on the azimuth display on the LCD a The degrees of the azimuth angle b The minutes of the azimuth angle c The direction of NORTH relative to the reference point d Silicon Laboratories logo e Heading direction relative to the reference point IL aud a b Figure 3 LCD Azimuth Mode Display 6 3 Another feature of the Digital Compass Reference Design board is measuring and displaying the ambient temperature Choose menu option t and press the ENTER button to select this option Temperature can be displayed either in Celsius degrees or Fahrenheit degrees as shown in Figure 4 Press the ENTER button to toggle between temperature displays Temperature is displayed by default using Fahrenheit degrees 9 Y H TEMPERATURE 133 F Figure 4 LCD Temperature Mode Display 4 0
11. ms responsibility for any consequences resulting from the use of information included herein Additionally Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters Silicon Laboratories reserves the right to make changes without further notice Silicon Laboratories makes no warranty rep resentation or guarantee regarding the suitability of its products for any particular purpose nor does Silicon Laboratories assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation conse quential or incidental damages Silicon Laboratories products are not designed intended or authorized for use in applications intended to support or sustain life or for any other application in which the failure of the Silicon Laboratories product could create a situation where per sonal injury or death may occur Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized ap plication Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders 14 Rev 0 1 SILICON LABORATORIES
12. n AOSNAS LIIL GNSV aN9v 160 OWH jivn0 32 0 oin 25 7 AZ 7 EE ogy HOSNHS SIXV Z aN9v 32 0 3110 32 0 129 922 Szo 929 ene 2901 OWH 92 LA LAQC LA Pa aano 3110 ub LA kama AG 29 LX oo onan LX TII 02H HOSNHS SIXV ASX TTHMAHNOH gt x 12 LABORATORIES SILICON RD DIGITAL COMPASS uonenje 3 SSVdINOD 0SESLSO8D 1 4920 022 lt 115344 2 lt et e 3 m gg g gt 2 gg 9110 954 V 99 AA Ley AGZ LNEE v9 AGOHLV EMS 879 NOLLAN LASAN N AQL 4N0001 Ovld 9d 979 auod Yee 854 CONV Yee GEN 9 sdf MOVPANOHd EE ld 13 gt x LABORATORIES SILICON DIGITAL COMPASS RD CONTACT INFORMATION Silicon Laboratories Inc 4635 Boston Lane Austin TX 78735 Tel 1 512 416 8500 Fax 1 512 416 9669 Toll Free 1 877 444 3032 Email MCUinfo silabs com Internet www silabs com The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice Silicon Laboratories assumes no responsibility for errors and omissions and disclai
13. nt for finding direction It consists of a magnetized pointer free to align itself accurately with Earth s magnetic field It is the oldest instrument for navigation and still is a vital tool even in present times when GPS exists Here are the definitions of some terms you will see throughout this user manual e the azimuth is the angle between magnetic north and the heading direction e declination is the angle between geographic or true north and magnetic north 5 Reference Design Board The following is a general description of the Digital Compass Reference Design board Dimensions 59 x 88 x 16 mm Weight 60 grams Function buttons SW1 MENU SW2 ENTER and SW3 RESET LCD display USB connector Debug connector USB and POWER LEDS Power connector Slot for 2 x AAA batteries Rev 0 1 2 05 Copyright 2005 by Silicon Laboratories DIGITAL COMPASS RD DIGITAL COMPASS RD Note The USB and power jack are under the LCD display LED LED USB POWER e BATTERIES 2xAAA Figure 1 Digital Compass Reference Design Board 5 1 USB The compass can easily be connected to a PC using the USB port Software is provided to communicate with the compass through USB This software displays the same information provided by the compass using a friendly interface See Section 8 for details on installing the provided software Additionally the USB connection provides power to the board when connected to a PC 5 2 LCD The
14. re 7 LCD Calibration Mode Display 2 Startrotating the compass and keeping it as horizontal as possible Figure 8 Any tilt of the compass during the rotation will introduce errors in the calibration values While rotating the compass the direction arrow on the LCD will turn around giving an indication to the user about how fast to rotate the compass The arrow will make one complete turn during this step of the calibration procedure It is recommended that while the arrow makes a complete turn the compass should be rotated at least 2 complete turns LED LED USB POWER DEBUG BATTERIES 2XAAA Figure 8 Compass Rotation during Calibration 6 Rev 0 1 e SILICON LABORATORIES DIGITAL COMPASS RD 3 Put the compass upside down again as horizontal as possible and hold it for a few seconds 4 Turn the compass back over to introduce the degree value of the declination angle Use the MENU button to increment the value The display will appear as shown in Figure 9 After the correct value of the declination angle for your region has been set press the ENTER button See Section 7 for an overview of the declination angle CALBRATION Figure 9 LCD Declination Angle Degree Display 5 Use the MENU button to increment the minute value of the declination angle The display will appear as shown in Figure 10 After you have finished press the ENTER button nc oY CALBRATION Figure 10 LCD Declination Angle Minute

DIGITAL-COMPASS

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