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    Reliable GPS and Compass sensors

    Hello,
    I want to know what is the best and reliable GPS and compass sensors to connect to a micro-controller?

    Thanks

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    Re: Reliable GPS and Compass sensors

    Hi,

    Another post asking for a "best" device....

    Ask 10 designers for the "best" part and get 10 different answers.

    Klaus
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    Re: Reliable GPS and Compass sensors

    Thank you KlausSt,
    Yes you are right, but as you get familiar with different sensors by reading their datasheet you can make a good decision. I am grateful if anyone can help me.



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    Re: Reliable GPS and Compass sensors

    Well, collect datasheets and start reading/studying to make YOUR decision.
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    Re: Reliable GPS and Compass sensors

    For compass, I have only used Honeywell and ST. They both seems to work fine for a dead reckoning project. For GPS, I have only used Ublox. There are other cheaper units from MStar.


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    Re: Reliable GPS and Compass sensors

    Hello,


    I tested 2 gps
    GPS UBlox N7 + COMPASS
    GPS Ublox NEO-6M

    both GPS are easy to use and connect to a MCU .
    Ublox provide a PC Software to test each GPS: U-CENTER
    and a good documentation

    for COMPASS , it is more complexe ...

    Click image for larger version. 

Name:	U-Center_GPS_NEO_6M_via_PL2303.jpg 
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    Re: Reliable GPS and Compass sensors

    Dear paulfjujo, I really appreciate your explanation.
    Some of my friends used Ublox GPS and they told me, in some situations they need more than 2 minutes to track the GPS satellites or need to reset the module, Did you encounter with this issue?



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    Re: Reliable GPS and Compass sensors

    Quote Originally Posted by baby_2 View Post
    ...in some situations they need more than 2 minutes to track the GPS satellites
    at the first run of GPS, yes, it need 2 or 3 minutes to get all satellites in view.
    it is a normal way for all GPS ..
    GPS store the last position, to speed up, next calculations.
    U-Center is a good tool to check all parameters to have the best initialising status.


    After , even doing power off and power ON, it need's only a fews secondes to get back the position
    if you are in same place ..
    GPS can gives a quality indicator , depends of the number of satellites discovered and theyre power signal.

    if weather is very cloudy, it's needs more time , because less satelites in the view.
    But i never get issue wich oblige to reset the GPS.

    Maybe considere also the application using the GPS !


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    Re: Reliable GPS and Compass sensors

    Quote Originally Posted by baby_2 View Post
    Dear paulfjujo, I really appreciate your explanation.
    Some of my friends used Ublox GPS and they told me, in some situations they need more than 2 minutes to track the GPS satellites or need to reset the module, Did you encounter with this issue?
    Like what paulfjujo said, there are three different start options; hot, warm and cold start. These values varies between manufacturers. Most GPS chipset uses the standard NMEA protocol but ublox uses both NMEA and their propriety UBX which is a binarized protocol with fletcher checksum. If you are worried about startup time, you could create a dead reckoning system as well using compass, speed. I based the calculation on this website; https://www.movable-type.co.uk/scripts/latlong.html. For compass you would have to calibrate it depends on your casing or inside a car.

    UBlox GPS works for me when I developed a vehicle location unit a while back (https://www.youtube.com/watch?v=_WJLDLymLKM&t=17s).


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