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Thread: Long Range Key Fob with USB Receiver : Hardware/Software Design Thread

  1. #1
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    Exclamation Long Range Key Fob with USB Receiver : Hardware/Software Design Thread

    I decided to post this here for suggestions on how to improve the design, Iíve wandered the forums for long enough I will finally post something to contribute to the community. I might produce these and sell them (or give away the instructions) if there is enough interest. I'm looking into designing a Key Fob to control my carputer.

    Specs (so far):
    USB Interface on the Receiver (So it is easy to use - and will fit in most configurations)
    Compact design on both the Key Fob and Receiver
    1 to 5 Buttons on the Fob (Maybe more)
    Long Range Operation (3,000+ Feet)

    Some ideas I was thinking about:
    Making the Fob a 2-Way device: Status LEDS & Control Buttons
    Possible Signal Boosters
    Having the option to turn boosters ON and OFF
    Having the option to turn the Fob's Receiver ON and OFF
    The Decoder/Encoder ICs have 8 data pins, so we could have 8 outputs and 8 inputs
    If someone can find a small (good looking) Key Fob the supports more than 5 buttons let me know.
    Put an inductive charger in the fob and making a charger for the car

    Below is the possible hardware it would use:
    RF Transmitter IC: $05.95 (3,000 Foot Range)
    RF Receiver IC: $09.80 (-116dBm)
    Button Encoder IC: $3.10
    Status Decoder IC: $3.10
    USB Module IC: $11.80 (Includes DLLs, and Programmers Guide)
    SMB LEDs: $? (Depends on Type)
    FOB Case : $2.42
    Battery Clip: $0.24
    PCB Boards: $?
    SMD Antenna: $01.75
    Signal Booster(ea.): $13.95 (+18dBm)

    Currently the ICs would be from linxtechnologies.com unless someone can point me towards a I2C Long-Range-RF / USB / Encoder-Decoder ICs.

    Foreseen QA:
    Will you release the Schematic? Maybe, there is a good chance of it since I am such a big fan of open source
    Will you release the Source Code? Maybe, there is a good chance of this too. (Read above)
    How much will it cost? I don't know yet (<$100 for a RX/TX set); I usually sell things cheap, so it would be the cost of parts (+shipping) plus a little extra for all the work
    Will you sell these as kits or pre-built? Probably both
    Why not make it WiFi / Bluetooth Compatible? I'm not that good of a programmer/EE, unless someone can find a WiFi/Bluetooth IC that is long distance, easy to use and cheap.
    Why put switches on the boosters/receiver? Those devices would always use power (unlike the transmitter - only on when sending), so they would run the batteries down faster.
    How long will it take to complete this project? Not long, summer break will be here very soon.

    My programming skills don't go very far into hardware interfacing (unless it already has a VB Module), so I may need help from someone on how to use the included drivers (part of the USB Module). And although I have made a few breadboard projects and stuff, this will be my first time with smd ICs and inkjet transferred PCBs: so it's should be an interesting (hopefully fun) project.

  2. #2
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    I have been looking for something like this for ages, what do you intend for it to control? Media functions??

    Keep us posted i am very interested !
    James

  3. #3
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    I have many relays in the car that are controlled by my custom media software, so I was planning on using this fob to unlock/open doors/trunk, start the engine, play my stereo, alarm, neons, headlights, and other stuff like that. but it should be able to control just about anything. For my software I was going to make something like the following:
    the four outer buttons control basic stuff(locks, engine, trunk) and then if you hit the center button once followed by an outside button there will be a different function, and hit the center button twice - annother function and so on. But that would be easily configurable throu code, you can make the buttons do anything

  4. #4
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    Yeah great, will the fob actually be able to transceive at 3,000 Ft i know these fobs now a days are good but 3,000 ft Good? so when your engine is cranked (via Remote) this will also start your carpc will it?

  5. #5
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    The document I am reading for the transmitter module says 3,000 ft (but you how those things go -striat unobstructed line), but that was why I thought maybe throw in a booster. I always leave my carpc running so I can call it :-) (carpc hosted website comming soon), but it could power it up (using a spare data pin).

  6. #6
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    Lol Carpc Web hosting service, there maybe a market for that! well i'll be very interested to hear any further developments and will be on the look out for a decent Fob.

    James

  7. #7
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    I'm interested in using a remote to pulse the startup regulator (Carnetix 1260) to tell it to start the PC. I understand Opus has similar functions. With that kind of range, I could start the PC from my office window and have it running when I got to the car.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  8. #8
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    http://cgi.ebay.co.uk/ws/eBayISAPI.d...sPageName=WD2V

    would this be useful at all? i know the fob looks a bit crappy but could this be turn into a usb device?
    just a though as i was looking around.

  9. #9
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    Looks good but it's not usb, you would have to put a usb chip to it or go through the parrallel port. The 5 buttons on my remote ( http://www.polycase.com/fb20-prod.asp ) match the buttons on my shifter more closely. I can get empty key fob cases or ones with close range boards already installed. But I do agree that is a much cheaper rought.

  10. #10
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    http://cgi.ebay.co.uk/ws/eBayISAPI.d...MakeTrack=true
    they also do 4 CH with built in relays. You have got me thinking now!!! time for a new project me thinks!! my Girlfriend's gonna love me!!!

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