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Button Resistors

Discussion in 'General Electronics Discussion' started by Manifestsa, Feb 24, 2015.

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  1. Manifestsa

    Manifestsa

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    Feb 24, 2015
    I'm just wondering if anybody can tell me where I would need to solder resistors for them to work with these buttons. These are steering wheel radio control buttons I am attempting to install and in order for the interface to be able to interpret these buttons they must have resistors of different values soldered to them and I am new to this type of thing. Any help would be greatly appreciated.

    Thanks.

    http://i356.photobucket.com/albums/oo6/rbmcfarlane06/20150223_223750.jpg

    http://i356.photobucket.com/albums/oo6/rbmcfarlane06/20150223_223807.jpg

    http://i356.photobucket.com/albums/oo6/rbmcfarlane06/20150223_223821.jpg

    http://i356.photobucket.com/albums/oo6/rbmcfarlane06/20150223_223740.jpg
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,490
    2,832
    Jan 21, 2010
    What are you trying to do? Are you trying to get some other circuit to "press" the buttons?

    If so, what do you want to use, an arduino perhaps?
     
  3. Manifestsa

    Manifestsa

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    Feb 24, 2015
    I just want the signal from the buttons to pass through some resistors if possible.
     
  4. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    Doing this will either degrade the signal if the microcontroller is relying on an analogue return signal to determine what button is pushed, or it will make no difference at all...
    A resistor will merely decrease the total current flow in-line with whatever you connect to it, and will create a small voltage drop across itself because of this.

    So... we need to know what your doing. Otherwise you can continue to be vague and cut one of the traces on the board. Once cut, you can follow the traces to determine the end-points, and reconnect the end points with a piece of wire with a resistor in the middle.

    *Note. your way may end up with a broken device. Have fun :)
     
  5. Manifestsa

    Manifestsa

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    Feb 24, 2015
    Thanks for the reply. Basically what I'm trying to do is install steering wheel controls in my Chrysler 300 which currently does not have any. A person on a different forum achieved this by purchasing a steering wheel control interface which allows you to retain your steering wheel controls with an after market head unit. On the forum he says the interface (PAC SWI-RC) can interpret the values from the resistors but in order to do this he had to solder some resistors of different values to the buttons, he did not go into any further detail. I had read on the SWI-RC manual that some vehicles have separate wires for each button and sometimes resistors need to be soldered to each wire in order for the interface to recognize them and I assumed this would basically be the same thing. Like I said I am new to all of this and I don't know exactly where to solder these resistors. I'm sorry for being so vague I should of went into more detail before but your help is greatly appreciated.
     
  6. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    That helps a great deal.
    As you said, some controls have a different wire for each button, other use resistors...
    There will be two major hurdles for you though, and I doubt we can help with them.

    First and foremost, I forget what the part is called, but it allows the wires to be ran up the steering wheel column AND rotate with the wheel. It is in the shape of a collar with wires in and wires out. This colar will be split in two parts, and one part will rotate with the steering wheel, the other will stay stationary. If your vehicle did not come with steering controls then you are most likely missing this part. Without this part you will need to rely on something battery powered and wireless.

    Second hurdle... Resistors range in a large number of values.... here is a link to the more standard values : http://ecee.colorado.edu/~mcclurel/resistorsandcaps.pdf
    Please note that there are many many more 'precision' values. Additionally, the control could be reading one of two things...
    Voltage, current, and resistance all work together.... This means that when a resistor is energized, there will be a different voltage on one side compared to the other... I am unsure if the controls are actually measuring the resistor, or if they are measuring the difference in voltage that the resistor has now created. To make matters trickier... without knowing what the stereo is expecting, we cannot even begin to guess what kinds of combinations the resistors must be to make this function.
    If we were designing from scratch this would be different. As we could dictate the values. We are attempting to talk to an existing system, we need some specifications on how to do so.

    Just to clarify... do you have a stock stereo, and are adding an aftermarket steering wheel control?
     
  7. Manifestsa

    Manifestsa

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    Feb 24, 2015
    I do have an after market stereo installed that I will be using. The part you were thinking of in the steering column is called the clock spring and I kind of figured that would be a hassle to get around but that's not something I'm going to worry about at the moment. The interface I purchased actually comes with resistors and the manual states the values of each resistor I do believe it is reading the difference in voltage as you had mentioned.
     
  8. Manifestsa

    Manifestsa

    6
    0
    Feb 24, 2015
    The other thing I was going to try is just to solder the resistors onto the wires which plug into the buttons but the only problem is there are 8 buttons but 9 wires so it is slightly confusing lol.
     
  9. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    If you got a book share it!
    We could all use a good look at it and recommend what to do. Those details are the hidden pieces we need ;)
     
  10. Manifestsa

    Manifestsa

    6
    0
    Feb 24, 2015
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