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HMC6352 I have a mystery — Parallax Forums

HMC6352 I have a mystery

SELSEL Posts: 80
edited 2011-04-20 16:53 in Propeller 1
When I mount the HMC6352 on The Propeller Professional Development Board all is well. When I mount it on StingRay's bread board I get no response.

I have followed the instructions for the data sheet as to how to hook up the compass.

This one has be stumped. I need some help here.

Comments

  • kwinnkwinn Posts: 8,697
    edited 2011-04-18 19:39
    SEL, you're not giving us much to go on. I would suggest checking to make sure you have power and ground on the HMC6352 module pins and then scoping the serial data and clock pins on the module to be sure they are getting to the board. If this checks out it is time to look at the software.
  • SELSEL Posts: 80
    edited 2011-04-19 11:36
    kwinn,

    I have vdd and ground. I have not scoped the input pins, but I am running an ADC0831 on the Stingray bread and it is attached to a Sharp IR sensor which is running a-ok.

    When I use the PPBD I use the same software that I tried to use on the Stingray BB. With the PPBD all is well.

    The support document from Parallax shows the hardware setup that I am using.

    I will scope out the pins and report back.

    Thank you for trying to help in this matter. I am an admire of your work!!!
  • kwinnkwinn Posts: 8,697
    edited 2011-04-19 17:32
    Thanks for the compliment. I looked over the schematic for the PPDB and the Stingray documentation and see no reason the HMC6352 should not work on both boards provided the same pins are used or the software is changed to accommodate different pins. One thing I have found is that the contacts on the prototyping boards are prone to fail with a lot of use. That is why I suggested you check the power, ground, and signals directly on the HMC6352 board.
  • SELSEL Posts: 80
    edited 2011-04-20 12:01
    kwinn,

    I agree with you. The bread board on the stingray has not been used until just these past two weeks. I will use my LA to check the output of the HMC6352 when bread boarded on the stringray. As I stated before, all is well with using the compass on the PPBD. I use the same pins and the same software for testing purposes. That is what makes this so hard to understand. On the stingray BB I am running an ADC0831 and it functions great. The testing software isolates the ADC0831 so it is not interfereing with the HMC6352.

    I will get back with the scope report today. I will also go over the ground and voltage connections, but I am using the same connections for the ADC0831.
  • kwinnkwinn Posts: 8,697
    edited 2011-04-20 13:12
    There is always the possibility that the bad contact is one of the ones the HMC6352 module is plugged into. That is why I suggested they be checked directly on the HMC6352 board. It is also a good idea to look at the signals while it is plugged into the PPDB so you know what they look like when it is working properly.
  • SELSEL Posts: 80
    edited 2011-04-20 16:53
    kwinn,

    excellent suggestion. I will try this tomorrow!

    Thank you and best regards
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