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Thread: BU-353 data capture inaccuracy?

  1. #1
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    BU-353 data capture inaccuracy?

    I have developed a small app for my carpc interface that enables me to email my current GPS coords to selected addresses by touching a button on the screen. Also plan to embed GPS data into some other mobile apps. I am using a BU-353 sitting on my dash.

    The GPS receiver works fine in any standard application, like BGPS or Google maps, apparently giving an accurate position for the vehicle.

    But when I open the serial port and capture the raw data, line by line from the BU-353, the lat and long info are about 2-5 miles off. I am locking on 7 satellites. I am even averaging 5 readings at a time. I am getting position info to 5 decimal places, but it is off by miles.

    Is there something else I need to do to adjust the raw data?

    Thanks

  2. #2
    SuperMod - OBDII GPS Logger forum
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    I'd suggest seeing whether gpsd returns the right value, and if it does, taking a look at the source to see what it does.

    Gary (-;
    OBDGPSLogger, for logging OBDII and/or GPS data
    OBDSim, an OBDII/ELM327 software simulator
    mp3car forums: obdgpslogger, obdsim

  3. #3
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    gpsd

    I'll check it out (have to install first). Thanks.

  4. #4
    North of the land of Hey Huns
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    Keep in mind that gps devices return lon and lat as degrees, then decimal minutes, not as decimal degrees so you have to split it up and convert it, otherwise you get values in between 5 and 50 miles
    "stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
    RevFE
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  5. #5
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    Exclamation Fixed!

    Malcom2073 was smack on!

    I snagged the php library from an Italian site. Something must have got lost in translation. As soon as I put in the correction, bingo.

    There might be some interest in my project. I wanted a customized carpc front-end. Since I am a web developer, I decided to create it with PHP, CSS, and Javascript. I serve the front-end as a website using Xampp as a standalone server on my carpc. With one-touch buttons on an 8" touchscreen, I can navigate and play audio files, search google, send emails (now I can stamp them with the current GPS coords), and make Skype calls. The architecture is all open-source and there does not appear to be any application I cannot execute and customize for my screen. I cloned it to my office PC, and I can do one-touch updates of the software in either direction through a remote server. For instance, I can download an mp3 or modify a system file on my office PC, then the next time I am in the car, I hit the update button and the system loads all of the changes.

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