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Member Since: October 30, 2006

Country: France

  • Are you joking? It is ATTITUDE, not Altitude!
    It means it gives you the space orientation (attitude = Phi and Theta, and Heading = Psi).
    Click on your link and see the wiki page title which is correct.

  • Impressive, the 430 units ran out of stock in few hours...
    I know there is a penury with that chip.

  • Hi,
    Does this module require CTS, RTS etc... to be wired? In the datasheet it says "no hardware control", but Sparkfun seem to have wired it. How did you communicate with it? I hope it requires only +Vbat, GND, TX0 and RX0. Please confirm.

  • Guys,
    I can not make it work properly.
    In 6g configuration, it seems the temperature compensation does not do its job, and simply when I blow on it, the output drops from 2000lsb (12 bits ADC) to 1800lsbn which is 10% or nearly 1g !
    In the spec, it is written 0.5mg/?C biais stability.
    Clearly I never saw this.
    However, mechanic stress does not affect the output, which is good news.
    Has anybody been able to make it work properly ?

  • Hi Guys,
    I've tried all the GPS modules of the Sparkfun website:
    - This is the best GPS.
    - 4Hz TRUE update rate with WAAS (or EGNOS in Europe), 5Hz without.
    - Real Doppler ground speeds (3 axes : North, Est, Down)
    - Completely configurable with the very easy to use Ublox UCenter software.
    - You can enable / disable every single data packet.
    - All the configuration can be saved to non volatile on board Flash memory.
    - The optional backup battery is only here to improve Time To First Fix when started within 4 hours after last use (after, the GPS needs to download ephemerids one more time which takes 29s).
    - I suggest using the proprietary data packets (binary) because it's REALLY easier to use, it takes less CPU time, it's already well structured for direct reading in C language, and it provides you more information (doppler speeds for example), the transmission is quicker (and then the time between measurement and transmission is shorter).
    - The GPS software can be updated and the configuration can be saved on PC.
    Answers to questions:
    - All the NMEA data packets are available at 4Hz (but be careful, you need high speed serial transmission).
    - The antenna (and then the module) has to be mounted vertically.
    The only negative thing is the connector.
    I recommend this module.

  • Hi,
    Fair enough.wold replace "orthogonal" by "not colinear" in your post.
    The magnetometer can output (on a I?C port) the 3 components of the magnetic field in the axes of the board of course.

  • This is not a AHRS Krogoth.
    It is a complete 3 DOF IMU, which only gives you the raw sensor data.
    I've spent 1 year to develop a complete GPS-aided AHRS from that kind of sensors, and I promise it's not easy, and would not be sold 124$ (see Xsense : http://www.xsens.com/en/general/mti-g which costs 4000euros without VAT).
    There is still something important missing: the integrated temperature sensor in each gyro if you want good performances (with your own temperature calibration).
    And the 9 DOF is not as wrong as it may be: you said it: 6 DOF for a 3D representation + 3 DOF for the magnetic vector as it doesn't represent the same thing. This vector depends a lot on your position on earth and you can even use it instead of gravity to get the vertical.
    A 9 dimension vector sensor would probably be a better title, but I'm very happy with that product.

  • The output latency is exactly the problem the basic gps have.
    This is because the output is filtered in order to get a position/speed which doesn't move too much. But for some users (and I believe you belong to them), getting very "fresh" data is important (AHRS with GPS for example), and I thought this GPS would solve the problem with its 10Hz update rate...you actually confirmed that it is not the case.
    The 10Hz seem to be in fact extrapolated, as usual.
    I have tested a lot of GPS modules, and the winner is:
    - Ublox : http://www.sparkfun.com/commerce/product_info.php?products_id=8889
    This is a true 4Hz GPS (without latency when properly set) as you can choose "pedestrian", "car", "airborne 2g", airborne 4g"...the output is of course noisy.
    It is the one I use in my UAV.

  • Hi,
    Here it is (but not in stock ?) !
    You didn't put a backup battery nor integrated antenna, it would have been nice (but maybe more expensive).

  • Hi,
    Are you guys working on a breakout board with backup battery and antenna ?

No public wish lists :(