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Thread: Connecting resistive "steering wheel media buttons"

  1. #1
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    Question Connecting resistive "steering wheel media buttons"

    I have a 1995 Range Rover HSE, - the resistive steering wheel buttons are grounded.
    If I connect a multimeter to earth and HU, I get different ohm readings when I push different buttons. When I connect the multimeter to "+" and HU I get the same 12V reading no matter which button I press on HU???
    I should be getting different voltage readings?
    Am I doing something wrong?
    Can fusion brain (analogue inputs) detect different resistances, or does it need to see changes in voltage?
    Any help would be greatly appreciated
    thanks and confused
    Peter

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    Quote Originally Posted by vultan View Post
    I have a 1995 Range Rover HSE, - the resistive steering wheel buttons are grounded.
    If I connect a multimeter to earth and HU, I get different ohm readings when I push different buttons. When I connect the multimeter to "+" and HU I get the same 12V reading no matter which button I press on HU???
    I should be getting different voltage readings?
    Am I doing something wrong?
    Can fusion brain (analogue inputs) detect different resistances, or does it need to see changes in voltage?
    Any help would be greatly appreciated
    thanks and confused
    Peter
    It needs to see voltage differences. However, you can make a Voltage Divider so that the voltage is never over 5v. I would use 14.4v as the input voltage because it should be 13.8v but some higher output alternators use a 14.4v system. But if you know you have a 13.8 system, then you can use that, but other readers should know that they need to check first.
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  3. #3
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    I cant see how this will help, as I get the same output voltage no matter which button I press. Wouldnt a voltage divider just drop the voltages, giving a lower voltage that is still the same no matter which button I press?

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    Think of it this way. You already have Vin and the first resistor. So you need 1 resistor tied to ground, and you measure between the two.
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

  5. #5
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    Thanks for your input - I think my multimeter is faulty, I will check that out first.

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    I'm wondering the same thing here. I've been talkin to the people on the FB site and they say that it measures up to 5v. My car has 1 SWC wire that varies the voltage for each button press. The lowest reading is 1.05 and the highest is 11.18. would I be able to hook up to the FB and still have function of all buttons? i'm reading about voltage dividers right now.
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    Quote Originally Posted by bigbuffs View Post
    I'm wondering the same thing here. I've been talkin to the people on the FB site and they say that it measures up to 5v. My car has 1 SWC wire that varies the voltage for each button press. The lowest reading is 1.05 and the highest is 11.18. would I be able to hook up to the FB and still have function of all buttons? i'm reading about voltage dividers right now.
    If the voltage changes between 11.18 and 1.05, then you are golden with a voltage divider.

    Use 1kohm and 2kohm as your 2 resistor values, and you will get this as the maximum:
    Name:  divider1.jpg
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    And for the 11v button press:
    Name:  divider2.jpg
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    And for the 1v button press:
    Name:  divider3.jpg
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    And of course the rest of the buttons will be inbetween the 11 and 1 output. The voltmeter in the images would be the Fusion Brain essentially. You only need the 1 wire into U1 (The Fusion Brain) as the FB is already grounded, and you dont need the +5v power. So it is a single wire connection to the FB.
    Fusion Brain Version 6 Released!
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    Quote Originally Posted by vultan View Post
    Thanks for your input - I think my multimeter is faulty, I will check that out first.
    What resistances do you get?
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

  9. #9
    Low Bitrate bigbuffs's Avatar
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    OK that won't be to hard. Could you explain the diagram a little more to me.

    I understand most of it but VCC is the wire running from my SWC's right. Then I put a 2k resistor in and the splice into the wire and send the splice to the FB (analog input). After the splice I put a 1k resistor in and then ground the wire? Does that sound right?

    Also another question about the FB. Is the FB powered by the USB port or does it require an additional power supply?
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  10. #10
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by bigbuffs View Post
    OK that won't be to hard. Could you explain the diagram a little more to me.

    I understand most of it but VCC is the wire running from my SWC's right. Then I put a 2k resistor in and the splice into the wire and send the splice to the FB (analog input). After the splice I put a 1k resistor in and then ground the wire? Does that sound right?

    Also another question about the FB. Is the FB powered by the USB port or does it require an additional power supply?
    Yes, VCC is just notation for a power supply, which is in this case varying from that wire (technically not true, but the concept holds true for something like this). So that wire you used to measure the 11v-1v is "VCC" and then you need to buy 2 resistors (I picked common values so you can buy from RadioShack for example). Those 2 resistors, just need to be the correct ratio. You could use 10kohm and 20kohm, or 1Mohm and 2Mohm, and so on it makes little difference. I suggest 1kohm, and 2kohm though as they are simple to find and cheap.
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

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