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Thread: Venus GPS development boartd with 1 to 20Hz update rate

  1. #11
    Maximum Bitrate Mickz's Avatar
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    http://update.gpsgate.com/install/GpsGateClient.exe

    The full site is http://gpsgate.com/download

    GpsGate Client Express for Windows is free for use without time limitations. Additional GpsGate Client Standard features are activated for a 14 day trial period. GpsGate Client Standard functionality requires an additional license.

    If you only want to split the output to TWO virtual com ports this will do it for free.
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  2. #12
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    thanks mate.
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  3. #13
    Maximum Bitrate Mickz's Avatar
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    Quote Originally Posted by SNOtwistR View Post
    I was reading the specs on the sparkfun before when researching and the sparkfun will only give you the higher refresh rate using gga That's why I settled in on the sure unit cheaper and included the antenna. SNO

    SNO is correct, Once I got up to faster speeds there is an anomaly in the update position on GPS - update is fast but position lags. I managed to get my BT‐Q818XT - 66 channel 10Hz update module working again (intermittently) so I can compare the streams when I get a chance - apart from that it's fine, if you want something tiny this is it but the unit SNO mentioned my be better for plug and play.

    EDIT: See post #16, #17
    Last edited by Mickz; 09-01-2014 at 02:54 AM.
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  4. #14
    FLAC SNOtwistR's Avatar
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    I have always found the higher the Hz the more accurate your position is, 5-10Hz can get down to a meter or under where 1Hz is around 3 meters on a good day. Not too many GPS apps take advantage of a higher Hz but Garmin happens to with the right receiver SNO

  5. #15
    Maximum Bitrate Mickz's Avatar
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    Quote Originally Posted by SNOtwistR View Post
    I have always found the higher the Hz the more accurate your position is, 5-10Hz can get down to a meter or under where 1Hz is around 3 meters on a good day. Not too many GPS apps take advantage of a higher Hz but Garmin happens to with the right receiver SNO
    Hi SNO I've used Garmin @5Hz for years with the BT‐Q818XT, this Venus Unit is updating Garmin @5Hz but appears to not be updating the Positional data correctly - I need to compare the two to be sure. I have a few setting to try before I decide which way to go with this, thanks for any input, BTW I initially had a quick read of documents on Sparkfun but didn't see any information on Update rate and GGA only stream, if you know where that is I'd like to read it - but don't sweat if you can't find it.
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  6. #16
    Maximum Bitrate Mickz's Avatar
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    Now don't laugh There are a number of options that can set and saved in the Module - one change had not stuck - dam thing was still outputting @ 20Hz and of course with the baud rate set to 38400 for 10Hz update (I thought had been "permanently" set) the port is going to be flooded. Reset and speed display is now updating at 10Hz correctly, BTW in my FE I'm taking the speed data from the NMEA RMC field, so it appears to match the BT‐Q818XT @ 10Hz, Garmin was now tracking correctly @ 5Hz (it's programmed limit). What can I say!
    Last edited by Mickz; 09-02-2014 at 06:20 PM.
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  7. #17
    Maximum Bitrate Mickz's Avatar
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    Ok, finally got the BT‐Q818XT to run for more than a few minutes so I can confirm that the NMEA RCM field (positional data, speed ,ETC) all appear to be coming out updated @10Hz (speed data is definitely being updated at that rate) and Garmin map position with speed matches the BT‐Q818XT, actually the Venus is better with Garmin and my Speed display by virtue of the external aerial and hence better overall Satellite strength and less uncertainty in position in poor locations. Very happy.
    Last edited by Mickz; 09-12-2014 at 08:15 PM.
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  8. #18
    Maximum Bitrate Mickz's Avatar
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    For what it's worth, this is the quick and dirty knock up I made to test the module. Standard plug headers soldered to the module allow it to be plugged into a socket on the vero prototyping board - Parts on board - two caps, 3.3v regulator and a backup cap. I tried a 1 Farad cap (shown on the vero PCB) as a backup supply and it had discharged from just over 3v down to 2.5 volts after 15 hours, I think the lower limit for backup to hold is 1.5 volts.

    Last edited by Mickz; 09-01-2014 at 10:01 PM.
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  9. #19
    Maximum Bitrate Mickz's Avatar
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    Just a quick update for anyone interested:

    Temporally mounted that small magnetic aerial central at the rear lip of the bonnet (that's about 1ft from the base of the Windscreen) Surprised it actually looks really neat and hardly noticeable, can't see any cable - I had a cable entry gland through the firewall already, so quick and easy for the test - I'm tempted to leave it there.

    Results are perfect - Under a 20ft X 20ft low steel carport with the nose of the vehicle against an aluminium panel lift door:

    Hot Start after 3 hours: - 1-2 seconds. My Car Computer takes around 12 seconds from IGN on to the FE fully running and FE immediately announces GPS lock, Speed lock and Time sync (from GPS). Lock Led on GPS module is usually flashing in 1 or 2 seconds.

    The other GPS (TS-GUM004) which has a backup battery takes a few seconds longer (sometimes a lot longer).

    Cold Start after 24 hours: Venus is running a few seconds after FE is up. Again under a steel carport - so around 20 seconds.

    TS-GUM004 micro GPS takes up to 5 minutes, sometimes a little more. Not quite as good a reception location though so a little unfair.

    Travelled to a few local bad GPS locations and also a couple of hours leisurely trip through the Mountain ranges the other day, normally would loose GPS for a few seconds, it never missed a beat- very happy with it.

    Must order a second aerial ($12.00) for the day it mysteriously disappears.
    Last edited by Mickz; 09-08-2014 at 01:18 AM.
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  10. #20
    Maximum Bitrate Mickz's Avatar
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    Finally had the time to take a look at the NMEA fields, that document SNO referred to is "partly correct" or possibly for the previous version of the board? I mean the document is incorrect not SNO

    Indeed not all NMEA fields are updated in real time, however there are TWO fields updated in real time, GGA as previous mentioned and the RCM field - position, velocity, time etc. The other fields are indeed updated once per second regardless of settings. This appears to be common in a number of GPS hardware devices, especially when running at lower Baud rates, some data sentences only updated every two seconds in certain cases.

    Again, this actually has the advantage of reducing USB/Serial data load and allows this device to run with headroom @ 10Hz at 38400 Baud instead of 115200 Baud, I suspect the reason for doing it this way.

    I'm so impressed with this unit that I'm ordering another and splitting one external active aerial between the two. I'm lucky enough to have a tiny RF hybrid Splitter that appears to have virtually no insertion loss to received GPS signals, at least I can't see any on the dozen or so satellite signal indicators. My reason for using two GPS receivers - My favourite GPS application is still Odyssey Navigator and like most GPS programs it runs at 1Hz, it does not like a 10Hz GPS signal, by using one active GPS aerial and two tiny receivers I can set one @ 10Hz update to the Vehicle GPS speed display and one @ 1Hz for Odyssey Navigator, as an added bonus I get GPS redundancy and I don't need another piece of SW (GpsGate) running on the Vehicle Computer to split a single GPS signal.
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