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Thread: Adding GPS to my RPi2

  1. #11
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    GPS Receiver / defeating funny forum software

    Quote Originally Posted by StupidDoes View Post
    So what GPS module would you recommend?? ....
    Recommending is somehow difficult, because I did it once. Which level of experience do you expect from such a person? To understand this statement read: "could be link" (this phrase denotes a link, which I am not allowed to post here)
    OK, I use this one: "could be link" and from what I am reading, Ublox Neo6 or higher devices do a pretty good job. For getting the PPS signal, you have to solder a wire to Pin3 of the Ublox module. "could be link" After some search you should be able to identify a device with the PPS signal connected to a soldering point as such.
    If you want to dig deeper, try: From this website you can get ample information on what to do. "could be link" But my last clue again is: For using PPS and gaining great time accuracy you do not need a GPS time input necessarily but PPS from GPS. You might use the common NTP scheme as well. Precision is about intergrating the PPS functionality, most easy from a GPS receiver. PPS is setting up NTP and (preferably) GPIO 18 on the Pi. Just one pin, no recompile of NTP, which you probably will find in old howtos.
    Enable PPS via device tree and edit ntp.conf. Eventuelly install GPSD for gaining full GPS functionality.

    This forum software is funny, stating: "Sorry rueckwaertsflieger, you are not allowed to post links in the forums. You must have a minimum of 4 posts in order to post links. You currently have 4 posts."

  2. #12
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    Quote Originally Posted by rueckwaertsflieger View Post
    This forum software is funny, stating: "Sorry rueckwaertsflieger, you are not allowed to post links in the forums. You must have a minimum of 4 posts in order to post links. You currently have 4 posts."
    Im having the exact same issues yet as of posting this I have 7? there a few on ebay but im not sure if these are just your typical cheap Chinese SH!£ or not. albeit there of a £12-17 id be more than prepared to spend that little bit extra on one that actually works correctly and not going to break after a few uses!
    Cheap one
    Higher priced one

  3. #13
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    (For the last time,) please be aware, the GPS rceiver will give no advantage for an ADS-B app. It is quite some kind of an effort to implement the PPS improvement for system clock precision.
    The cheap one is the one I am using successfully. Big disadvantage is you have to have advanced soldering skills to pick up PPS. The higher priced one exposes the PPS signal to a "real" pin on the header besides the all expected RxTx signals. Should work also. In case, I am allowed to post links here, I will report them later.

  4. #14
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    yes but you could learn from the experiance and you would end up with your NTP time server for everything else in your home

    http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html

    i learned a lot from this page in setting up a ntp server on a beaglebone.
    T-EGLF8

  5. #15
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    Yes SpaxmoidJAm, thank you, that's one of the good references I cannot post here.

    @StupidDoes
    Please pay extra attention to section "Configuring Linux for PPS on the GPIO port" because recent Raspbians definitely do require less things to do than older tutorials say, guess how I know - summary at the end. If you want use the GPS time feed additionally you best install gpsd, though ntp is even enabled to read from serial port GPS without GPSD module as well, using driver 20 (without gpsd). Have fun.


    Things to do with a raspberry, when attaching a serial GPS receiver - short form:

    Serial port, if you want connect the GPS feed, use the whole story (I guess you want)
    free the tty at boot time, in:
    /boot/cmdline.txt commentout:
    # `console=ttyAMA0,115200`
    # and `kgdboc=ttyAMA0,115200`

    remove/comment the default tty configuration.
    /etc/inittab comment out
    # Spawn a getty on Raspberry Pi serial line
    # T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

    Todo for PPS kernel support
    /boot/config.txt add
    dtoverlay=pps-gpio # default-pin is 18
    init_uart_baud=9600 # only if GPS is attached to UART (serial port)

    pps-gpio module to be loaded at boot time, in:
    /etc/modules add
    pps-gpio

    Then proceed with editing ntp.conf regarding the link from SpaxmoidJAm.

  6. #16
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    Quote Originally Posted by rueckwaertsflieger View Post
    (For the last time,) please be aware, the GPS rceiver will give no advantage for an ADS-B app. It is quite some kind of an effort to implement the PPS improvement for system clock precision.
    whats with the attitude @rueckwaertsflieger. Who actually said it was solely for FR24???

    Thanks for your input @SpaxmoidJAm I appreciate it!

  7. #17
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    It's not an attitude. Hes just making sure its very clear.

    Given the thread you started to continue on has the first post based solely on that. And first post went down the same road asking the cheif if it made a difference if it was a different type

    Would a GPS receiver that uses the GPIO on the RPi work any better than a USB GPS device?
    Thanks
    Before going astray from the original
    Posts not to be taken as official support representation - Just a helpful uploader who tinkers

  8. #18
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    Quote Originally Posted by StupidDoes View Post
    Mike,
    Would a GPS receiver that uses the GPIO on the RPi work any better than a USB GPS device?
    Thanks
    Today FR24 only accept GPS data from the FR24 receiver. So it does not matter how and where you connect a GPS the data will not be used. We are investigating other options but the timing is really crucial here, and at the moment only FR24 receiver GPS data is used.

  9. #19
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    Quote Originally Posted by StupidDoes View Post
    whats with the attitude @rueckwaertsflieger. ...
    :-) , nothing except for this is a flightradar24 forum :-)

  10. #20
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    Quote Originally Posted by rueckwaertsflieger View Post
    :-) , nothing except for this is a flightradar24 forum :-)
    If you really want to add GPS to the RSPi, then check out this https://www.pi-supply.com/product/ad...v=79cba1185463

    A friend recently purchased one and being a tech geek and a wizard at what he does, had it all up and configured in under 1/2 a day...
    If life is a stage, most of us are unrehearsed...!

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