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How could I get Information from an unknown Compass Model — Parallax Forums

How could I get Information from an unknown Compass Model

chenguanyannchenguanyann Posts: 15
edited 2011-09-15 13:40 in Accessories
This is the Compass Picture
IMG_8222.JPG

IMG_8223.JPG


But I can't find it's spec...
The compass module has the following main chip used:
WT50F5, HMC1022, MCP6021

How can I solve the sensor signal?

Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2011-09-14 20:53
    The MCP6021 is an op-amp; the HMC1022 is a "magnetic sensor"; and the WT50F5 is an 8bit microcontroller with 8k flash mem., an 8ch, 12b ADC, and an LCD driver.

    I found datasheets for all three devices.

    It probably runs on its own and sends data to an LCD (not included.)

    There are only those 8 pins.
    Perhaps by spending some quality time with those datasheets and Mr. Ohmmeter you could trace out which are +V and GND and the LCD pins.
  • chenguanyannchenguanyann Posts: 15
    edited 2011-09-14 22:07
    PJ Allen wrote: »
    The MCP6021 is an op-amp; the HMC1022 is a "magnetic sensor"; and the WT50F5 is an 8bit microcontroller with 8k flash mem., an 8ch, 12b ADC, and an LCD driver.

    I found datasheets for all three devices.

    It probably runs on its own and sends data to an LCD (not included.)

    There are only those 8 pins.
    Perhaps by spending some quality time with those datasheets and Mr. Ohmmeter you could trace out which are +V and GND and the LCD pins.

    So I can't get the value without LCD. Right?
  • Mike GreenMike Green Posts: 23,101
    edited 2011-09-14 22:34
    Who knows? The WT50F5 is a microcontroller with an unknown program in it. It could be doing anything. If you look on a datasheet for this microcontroller, it says that the microcontroller has a 16 x 4 LCD driver on the chip, so that's why PJ suggested that it sends data to an LCD. That's all we know. You'll have to figure out the rest on your own.
  • chenguanyannchenguanyann Posts: 15
    edited 2011-09-14 22:44
    Thanks, I try it!
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2011-09-15 13:40
    I looked over the WT50F5 datasheet and its 16x4 LCD is for a segment type LCD, not a dot-matrix (4-line 16-character) like what Parallax sells.

    The assembly has 8 pins, 2 must be for power, so maybe 6 are for LCD data (segments). Maybe it shows N, S, E, W or... maybe it uses segments to "point" to a compass heading on a bezel.

    ???

    If you can pin out the power pins (they may trace back to the op-amp), applying 3-5V might get it to start knocking out "data".
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