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HCM 5843 Magnetometer DIYdrones Board I2C Interface Behavior of the Data Signal

HCM 5843 Magnetometer DIYdrones Board I2C Interface Behavior of the Data Signal. I´m experiencing a strange behavior of the signal of the HCM magnetometer. As you´ll see in the next pages, as soon as the board is power-up, the signal is very good and remains good for a period of time.

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HCM 5843 Magnetometer DIYdrones Board I2C Interface Behavior of the Data Signal

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  1. HCM 5843 Magnetometer DIYdrones Board I2C Interface Behavior of the Data Signal

  2. I´m experiencing a strange behavior of the signal of the HCM magnetometer. As you´ll see in the next pages, as soon as the board is power-up, the signal is very good and remains good for a period of time. After 8 minutes approximately , the signal begin to deteriorate and became useless ...

  3. The Hardware Serial Comm with LabView Arduino Duelmilanove 13.8V Batt to 7809 Regulator To keep attached to a leveled surface, and static 9V from 7809 I2C Interface SDA=A4 (Yellow) SCL=A5 (Orange) 7809 Volt Regulator to Arduino Vin

  4. The Hardware 4k7 pull-up resistors for SDA and SCL Yellow wire = SDA Orange wire = SCL 5V from Arduino GND from Arduino (black wire) 5V from Arduino (red wire)

  5. Code for Arduino I got measurements with two diferent codes for Arduino with the same results: - A code from ArduIMU that uses the Wire library - A code that uses the HMC library

  6. Results • - The Arduino board sends, through serial port, the data to the computer (approx. sampling rate 8.33Hz); • - On the computer there is a LabView program that deal with data and show it in the way that you´ll see in the next pages; • The data that Arduino sends: • Mag X = raw data from magnetometer • Mag Y = raw data from magnetometer • Mag Z = raw data from magnetometer • Heading = calculated from the data above

  7. After 2 minutes: Good data, no spread (see Histograms) and very low standart deviations (click to see) 0 min 2 min

  8. After 5 minutes: Data remain good, no spread (see Histograms) and very low standart deviations 3 min 5 min

  9. After 8 minutes: ( * ) start of the problem, increase in the spread (see Histograms) and in the standart deviations ( * ) 6’ 20” 8’ 20”

  10. After 10 minutes: High spread (see Histograms) and high standart deviations, make the data useless 8 min 10 min

  11. After 14 minutes and 30 seconds 12.5 min 14.5 min

  12. After 25 minutes 23 min 25 min

  13. Questions • What am I doing wrong? • Why as soon as the board is powered-up the data is good and reliable? • Arduino and the HCM5843 board are not compatible? • Could my HCM5843 board be defective?

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