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Thread: Interest check: Camry/Scion Steering Wheel Control -> USB

  1. #1
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    Interest check: Camry/Scion Steering Wheel Control -> USB

    Hi,

    I'm new to posting here, but I guess i've been lurking here for awhile now. Anyway, I was developing my carpc when I ran into the steering wheel control problem. I have a gen6 camry, but I'm fairly sure the wiring is the same for gen3 and up. I was browsing solutions for steering wheel control integration, and they all seem rather expensive - and unreliable. The most popular seems to be the SWI-X, but that is designed for headunit integration and emits IR signals, which you must then trap and intercept using an IR reciever - this seems overly complicated to me for such a simple human interface device, and very expensive - SWI-X costs ~50-60$.

    my proposal is to construct a hardware interface to connect the 20pin connector directly to USB. I've researched the controls, and it seems that the steering wheel controls consist of 3 wires (pins 7,8,9) which use alternating resistance values to indicate which buttons are being pressed. This could be easily interpreted by a microcontroller. The goal is to keep the cost low. I estimate the parts required to be:

    Circuit Board (~$3)
    Atmel Attiny or Atmega microcontroller (20-pin, 4k flash) (~$3)
    Harness for 20-pin connector (~$3)
    USB connector (~$0.50)
    Diodes (~$0.50)
    Resistors(~$0.50)
    Crystal(~$0.50)
    Capacitors(~$0.50)

    Which would be about $12. The firmware would be relatively simple, and I should be able to do that in a day, and the circuit need not be overly complex. The main issue is finding a compatible connector. Also, if the other wires are used by something else, a pass through connector might be needed (though, in my camry, I only have 3 wires connected to this connector). The device would not require any drivers, it would appear as a human interface device, and the buttons would by default mapped to volume, up/down arrow keys, and (not sure about mode button yet).

    I thought this project might benefit other people, and it would be nice to have a fabricated silkscreened board than my typical self-etched board... If enough interest gathers up, perhaps I can buy parts in bulk and sell them pre-made (for a small fee) or in kits.

  2. #2
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    intresting... I have a new toyota tacoma, should be pretty close to the same thing.. I'd be intrested.

  3. #3
    Low Bitrate mr2mac's Avatar
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    Heres my effort:

    Apple Remote Steering controls.

    What type of pins are in the connector? There must be a crimp connector that would fit it?

    nick

  4. #4
    Raw Wave lostreception's Avatar
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    im interested as well
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  5. #5
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    I'm also interested in this board.
    Will you be selling it as a kit, or will you be selling the flashed chip as an option too, with schematics?
    thanks.

  6. #6
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    Quote Originally Posted by mr2mac View Post
    Heres my effort:

    Apple Remote Steering controls.

    What type of pins are in the connector? There must be a crimp connector that would fit it?

    nick
    sorry for the late reply everyone, i've been busy with non-carpc related stuff recently. The connector is a strange one, im sure theres some type of crimp connector or molex that would fit it, I will take pictures of it once i pull out my radio again sometime this week.

    I've done a quick design of the schematic, i will get it posted up shortly. about it being sold as a kit, probably =), with schematics. About the tacoma, it probably has a similar connector, ill let you know once i get to it.

  7. #7
    Variable Bitrate
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    I'm definitely interested! How'd you go no2chem?

  8. #8
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    I would definitely be interested, Save me alota time fabricating this. Heck id buy a kit just to get that damn connector. I know digikey has it, they have everything....

  9. #9
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    oops, I know I haven't updated this in a while, didn't really have time to work on it until now.

    anyway, heres a rendering of the board, i'm waiting for it to come back from the pcb house, it should be compatible with toyota/scion, instead of finding the 20-pin connector, I used a terminal block so you have to wire it manually.

    the firmware emulates a usb keyboard, and the buttons are reprogrammable...

    thats all for now until i get the board.
    Attached Images Attached Images  

  10. #10
    Variable Bitrate
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    looks sweet .. what's the dimensions of the board?

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