First Project - Send Data to USB

Discussion in 'Embedded Systems and Microcontrollers' started by Jasonb61, May 3, 2010.

  1. Jasonb61

    Thread Starter Member

    Jul 31, 2008
    10
    0
    I have almost completed my in-car computer system and have a few obstacles to overcome. One of which, are the factory steering wheel controls. I'd like to retain functionality and understand how they work, but I have no idea how to interpret the signals for my computer.

    I believe the project should be pretty simple. The controls use a single wire and have different sized resistors in-line on the controls so different resistance values are read for each control (Vol +/-, Track up, Track down).

    Anyways, I was wondering how I can take the readings from that wire and send a representative piece of data for each function. I can do the programming on computer to make use of the data received - I just need help getting it there.

    Hope I was clear enough lol Thanks everyone!
     
  2. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    do you have a circuit diagram, or something to go off from?

    B. Morse
     
  3. Jasonb61

    Thread Starter Member

    Jul 31, 2008
    10
    0
    I have nothing, honestly. Unless you are talking about the diagram of the stock steering wheel controls.

    However, I believe I am just going to use an Arduino to handle this along with a few other truck-to-computer functions I have in mind. I am new to all of this and the Arduino seems like a good place to start.
     
  4. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Why not just use the parallel port?
     
  5. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    The stock steering controls diagram would be a very good start....

    B. Morse
     
  6. MMcLaren

    Well-Known Member

    Feb 14, 2010
    759
    116
    I suspect those switches are being read by an ADC (analog to digital convertor). Different switch presses will present a different resistor divider value to the ADC.

    Probably easy enough to read the switches with the ADC module in a microcontroller but not sure how you could present the same resistor divider value to the original circuit from the microcontroller.

    Regards, Mike
     
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