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Thread: uSDC20D On Sensing

  1. #1
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    uSDC20D On Sensing

    Can anyone please help me? Iím having problems wiring up my uSDC20D I have wired up everything apart from the on sensing connection which I have tried but with no luck, everything else works fine. Has anyone made the on sensing work if so could you help me with instructions and a list of components and where I can get them from? Any help will be appreciated.

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    You are wiring this up to what kind of motherboard?

    1. Does your computer work properly WITHOUT the uSDC20D installed? You should be able to test this by hooking the computer directly to the car power source without the uSDC20D involved. Using the power on wires to the header on the motherboard touch them together briefly. Your computer should start.

    2. Are you sure you have wired the uSDC20D correctly? Double check that all wires from the car to the uSDC20D ARE WHAT YOU THINK they are and that all wires from the uSDC20D to the computer are likewise. Use a digital multimeter to do this.

    3. If you are certain you have hooked up the uSDC20D properly, connect the multimeter to the power outputs of the relay. You ought to get zero volts (it's possible you might get a very slight reading, but it would be very low). Turn the car on and check the multimeter. You should get 12 volts if it is working properly.

    4. Long shot, but may work. I had a similar problem when hooking up a different type of device that does substantially the same thing as this one does. I reversed the wires that came from the device and went to the power "on" header pins. That fixed it. *If you don't get what I'm talking about, DON'T do it! You could damage your computer if you mistake which wires I'm suggesting that you reverse!*
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  3. #3
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    Quote Originally Posted by jamiecc
    Can anyone please help me? Iím having problems wiring up my uSDC20D I have wired up everything apart from the on sensing connection which I have tried but with no luck, everything else works fine. Has anyone made the on sensing work if so could you help me with instructions and a list of components and where I can get them from? Any help will be appreciated.

    If you draw a diagram in Paint or whatever of your setup I can tell you exactly how to connect the on-sensing connection. 5 volts is the easiest way to do it.

    Basically the way it works is if it detects 5 volts on the pin when it goes to turn off the computer, then it turns off. If it detects 0 volts, it won't turn off the computer because it knows its already off. Hense the 0 volts.

    any diode to 5 volts of your power supplys output will do the trick. If your going to 5 volts, you MAY be able to not use the diode. Diode points twards the USDC20D.

    -Jeff
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  4. #4
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    Ok thanks do you know where i can buy the correct diode and where it is connected to the motherboard or power supply is there any chance of a diagram. Everything works great apart from the on sense.

  5. #5
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    Quote Originally Posted by jamiecc
    Ok thanks do you know where i can buy the correct diode and where it is connected to the motherboard or power supply is there any chance of a diagram. Everything works great apart from the on sense.

    Your right. I don't have a good diagram of it. I'll make one soon to match the others.


    Here you can see the diode.
    http://www.mpegbox.com/microsdc/index.html


    Basically you take a 4pin y extender for a harddrive or splice into the motherboard power cable You want to connect to 5 volts.


    -Jeff
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  6. #6
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    Quote Originally Posted by zootjeff
    any diode to 5 volts of your power supplys output will do the trick. If your going to 5 volts, you MAY be able to not use the diode.
    Can you be more specific? Why would you have to use a diode with the PC 5V output? When could you get away with not doing?
    Quote Originally Posted by zootjeff
    Diode points twards the USDC20D.
    I thought it was supposed to be away?

    And why isn't the diode just part of the controller?
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