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Thread: Dialing into your car

  1. #11
    phc
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    Quote Originally Posted by DKnight
    In building my new system I had a thought, has anyone done a setup where you can dial your car from your home PC? I've used sprint PCS before with my laptop, but the phone was not acctually a modem so the laptop could not answer incoming calls, but if there was a phone, or software that would allow a computer to answer the incoming call I could see myself getting another phone for the car. Anyone got Ideas??
    In the Feb issue of Circuit Cellar Ink, there was an interesting article on Wireless Vehicle Tracking (part 1) - Part 2 in march issue. It details a project that had an alarm that when tripped, made a cell phone call to a pre-determined phone number and gave gps coords., speed, heading, etc. via audio. Also allowed user to call cell and get data at any time. Really cool project.

    http://www.circuitcellar.com/

  2. #12
    The Vauxhall Vectra Project ccsnet's Avatar
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    Correct me if I am wrong but I am sure one of the more senior members of this board has already done this where by the car fed back over gprs both a web cam and his live postion to a real web site... can't rember who it was though as it was some time ago I saw this.

    Terran

  3. #13
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    If only carputers arent so expensive and doesnt use so much power, I could set it up via a simple windows automation software to send a short message service (SMS) to a local number the GPS location of the car where the owner can track it from the web, every hour.

    But limits are:
    1) carputers are expensive and cant be fit in many cars
    2) it has to be on all the time
    3) gotta buy a data-based mobile phone (GSM, GPRS)
    4) gotta pay the monthly mobile line

  4. #14
    Maximum Bitrate owenjh's Avatar
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    Could use wake on ring to turn your computer / car on :-D Only if the software that comes with the phone supports it, as it is not a real modem
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  5. #15
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    Quote Originally Posted by masch
    But limits are:
    1) carputers are expensive and cant be fit in many cars
    2) it has to be on all the time
    3) gotta buy a data-based mobile phone (GSM, GPRS)
    4) gotta pay the monthly mobile line
    1.) isnt this caputer forum..where people have carputers in their car already/?
    4.) isnt their any plans where u only pay for the calls (or one of those where u pay for so many minutes, then can buy more calling cards or something to get more minutes?)
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  6. #16
    Raw Wave Laidback's Avatar
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    Quote Originally Posted by masch
    I could set it up via a simple windows automation software to send a short message service (SMS)...

    3) gotta buy a data-based mobile phone (GSM, GPRS)
    you don't need a data-based phone for SMS

  7. #17
    See me in my wet t-shirt. stevieg's Avatar
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    I've been looking at doing this in the next few months with my new install. I'm looking along the lines of writing a client/server to keep the costs down. Basically I'm thinking along the lines of:

    * PAYG GPRS (In the UK on Orange 4/MByte)
    * UDP Server running on known IP address
    * Client connecting to UDP port and 'posting' the data (along the lines of 523xxxN0013xxxW\n and not waiting for 'OK' response or possibly shortening the GPS string by stripping out the bits I'd know)

    UDP to cut down the IP packet sizes, known IP address to save the extra DNS query etc - If i'm paying per byte It's going to add up over time.

    Then once I know how much it's going to cost per 'transaction' I'm planning to work out how long I spend driving on average and set the schedule to whatever fits my monthly budget for 'tracking'.

    It's going to be written in perl mainly because it will only take a couple of hours to do both client and server, I hope.

    However an easier way if your not trying to cut the packet sizes down that much would be to have a simple web application on a web server that logged data sent to a file, and using a GPRS modem running 'wget http://servername/log.php?loc=523xxxN0013xxxW' on a schedule - GPRS only charges for data sent and as long as nothing else is going to request internet data the car pc could be set for autodial.
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  8. #18
    Raw Wave Laidback's Avatar
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    Quote Originally Posted by stevieg
    However an easier way if your not trying to cut the packet sizes down that much would be to have a simple web application on a web server that logged data sent to a file, and using a GPRS modem running 'wget http://servername/log.php?loc=523xxxN0013xxxW' on a schedule - GPRS only charges for data sent and as long as nothing else is going to request internet data the car pc could be set for autodial.
    That's an interesting idea!

  9. #19
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    Quote Originally Posted by stevieg
    I've been looking at doing this in the next few months with my new install. I'm looking along the lines of writing a client/server to keep the costs down. Basically I'm thinking along the lines of:

    * PAYG GPRS (In the UK on Orange 4/MByte)
    * UDP Server running on known IP address
    * Client connecting to UDP port and 'posting' the data (along the lines of 523xxxN0013xxxW\n and not waiting for 'OK' response or possibly shortening the GPS string by stripping out the bits I'd know)

    UDP to cut down the IP packet sizes, known IP address to save the extra DNS query etc - If i'm paying per byte It's going to add up over time.

    Then once I know how much it's going to cost per 'transaction' I'm planning to work out how long I spend driving on average and set the schedule to whatever fits my monthly budget for 'tracking'.

    It's going to be written in perl mainly because it will only take a couple of hours to do both client and server, I hope.

    However an easier way if your not trying to cut the packet sizes down that much would be to have a simple web application on a web server that logged data sent to a file, and using a GPRS modem running 'wget http://servername/log.php?loc=523xxxN0013xxxW' on a schedule - GPRS only charges for data sent and as long as nothing else is going to request internet data the car pc could be set for autodial.
    StevieG,
    Brilliant idea. The only downside I can think of is that the phone needs to be in the car to be able to track it. Not ideal if the car is stolen.
    As GPRS is alway on it shouldn't even need to autodial. Couldn't the carPC just do a put onto a server at pre-determined intervals?
    I would have thought a position fix would have been in a packet of less than 100 bytes so that's 10,000 packets per Mb, T-Mobile charges 7.50 per Mb so that's errrrmm not very much! Hope my math is right but I think that if it updates every 15 seconds that's still over 40 hours of position fixing per mb.
    We've been selling a self-contained black box tracker that uses GSM data calls to get the position of the unit. The control PC then displays the position on the street level mapping. Does a few other nice tricks as well. Could be an option if people want to track their own vehicles.

    Doug

  10. #20
    Newbie chunky's Avatar
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    I think this kind of thing would be best done on an on request basis. Like, server receives an sms or an IP based request, then sends GPS data back by the same medium.

    It would really suck to get a virus on a gprs connection. I would suggest locking that baby up REAL tight.

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