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Thread: Proximity Unlock, Computer Power On

  1. #1
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    Proximity Unlock, Computer Power On

    This was posted in another thread, but I thought it deserved it's own. Originally posted by Mad Jad.
    --------------------------------
    Walk within 20feet (adjustable) of your car and the alarm disables, doors unlock, and carputer turns on (plus whatever other relays you want to hook up). NO pressing any buttons required. Just have the remote in your pocket and the car will detect its presence.

    Walk 20ft away and the doors lock, carputer gracefully shuts down (via ATX), and alarm enables.

    Price would be approx. $50 + shipping, including two transponder remotes that have lock/unlock manual-override buttons on them. Use it for keyless entry, alarm, and carputer.

    I don't have much info, but I have a quick blurb of a press release that a friend gave me:

    Innovative new product; "hands free" keyless entry system with engine immobilizer, very similar to extended options package on brand new luxury class Mercedes and BMW automobiles. Adjustable range debouncing trigger works in conjunction with transponder remotes to effectively detect the presence of the driver. Simply approach the vehicle and the alarm system disarms, dome lights turn on *, and doors unlock. Move far enough away from the vehicle and it arms and locks the doors.

    -Two compact transponders included
    -Dome light supervision output*
    -Valet Mode
    -System status LED indicator
    -Horn chirp output*
    -Emergency override capability
    * Depending on vehicle, a relay may be needed to make these features work.


    This version that I'm looking at is the most reasonably priced version, and it is by no means cheap. The price is low because only a few relays are built in (a few is all you really need), and the technology is easy to mass-produce. It is not the flashiest system out there, but it definitely gets the job done.

    I'll try to get some more info from the manufacturer, but it could be a week before it trickles down to me.

    Thanks,
    Jad
    ----------------------------------------------------
    I thought this would be really slick.
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  3. #3
    Variable Bitrate
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    Those are all the details I have, contact Mad Jad for more. I would imagine it would if you already had a remote start system.
    Silver 1999 Nissan Pathfinder!
    Completion: [*********-] 90%
    Everything working! Mobile MP3s ROCK!
    LEFT TO DO: Improve power on circuit, fix slow boot time

    - 550mhz PIII on Abit BH6
    - 128MB RAM
    - 40x4 Backlit Character LCD
    - 17 key numeric keypad - Repainted buttons
    - 2.1GB laptop drive for OS
    - 4.3GB drive for MP3s

    http://www.mp3car.com/usersites/bombboyer/ Redesigned, new pics!

  4. #4
    C4M
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    Although it sounds kind of slick, I'd be concerned about it from a security perspective.

    I'd rather control the unlocking of the car as I approached it. In addition, I imagine that it would be a pain if your destination was less than 20 feet away and the car was out of sight (ie you're in a restaurant next to the carpark.

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  5. #5
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    Wouldn't you flatten a battery every month in the "remote"?? Yeah, and what if you DON:T want to turn the computer off, like when you go in to pay for gas, or to pick up a pizza, etc...
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  6. #6
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    i remember reading somewhere about a little coinsized device that attaches to your key ring that when you walk s many feet away the receiver on the computer locks the computer down unfortunatly i don't recal the name of it i suppose sumthing like that would not be to hard for the pogrammingly gifted people on here to modify the program or make anew one that would also lock down the car or sumthing with a relay pack as well as tun on a shutdown timer so im x amount of time it powers down or hibernates or sumthing anyways i will try to dig up the info on it again
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  7. #7
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    Wouldn't you flatten a battery every month in the "remote"??
    No; the way the transponder system works, there is very little battery usage by the remote. It will die sooner than a regular keyless entry remote, but still will last decently long time.

    Yeah, and what if you DON:T want to turn the computer off, like when you go in to pay for gas, or to pick up a pizza, etc...
    Well this would require some additional circuitry. If I can bundle in an ATX shutdown controller with it, then I'd use one with the following functionality:
    Proximity shutdown delay - wait x seconds/minutes when user leaves proximity to send shutdown signal. Perhaps this could be done by having two relays on the shutdown controller, one to be triggered immediately when user leaves area, and one to be triggered x seconds/minutes after user leaves area with the counter reset if the user comes back.
    I can not do this circuit because I do not yet possess the electronics skill, but if someone thinks they can design an ATX controller with this functionality and produce 50-100 for $25 or less apiece, I will bundle it in with the hands-free keyless entry systems I get. If you seriously can do this, contact me for full details.

    Actually the easiest would be a switch for the keyless-entry-to-computer-shutdown relay that you could flip if you want to have the computer ignore the automatic keyless entry system. When you run in to pay for gas or something like that, just flip the switch so that the keyless entry system trigger doesn't talk to the computer and tell it to shut off when you leave the proximity.

    a little coinsized device that attaches to your key ring
    If you can find this, I'd be interested in getting one and rigging some custom drivers for it that we could use.

    I imagine that it would be a pain if your destination was less than 20 feet away and the car was out of sight (ie you're in a restaurant next to the carpark.
    This is what the manual override is for. And you can adjust the proximity so that it's within 5ft of car. I can't think of any instance where you will be within such a small proximity of your car and not be able to see or even hear someone attempting to get into it.


    I'll get back to this thread with more information as soon as I get it. Should be in the next few days.

    Thanks,
    Jad

  8. #8
    FLAC
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    If your car is parked in the garage or driveway and you are walking about your house you may accidently turn on and shut off your alarm/computer/etc.. several times in a short period of time. If you make it 5ft though I don't think it would be a problem.
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  9. #9
    Maximum Bitrate eugenen's Avatar
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    I would make a guess that they work like those in store security systems, you know the ones with the little sticky thing that sets off the alarm if it goes through the door. They are simply a piece of metal that will be "tuned" to a certian freqency. The trasmitter in the car would provide all the power then. BTW those things are fun to play with, you can peel them off packages and lay them on the floor stick side up and set and wait for someone to step on it ans stick to their shoe. Don't ask me how I know this

    You could also do it electronically, have a device that works like a pager, it listens for a signal and when it receives it it then transmits back.

  10. #10

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