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Thread: Velleman K8055 help.

  1. #1
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    Velleman K8055 help.

    I'm looking at using one of these connected to my car pc to control lights etc. But I need a little more assistance with the wiring.

    can the digital outputs act as replacements for the switches in my car. For example can I run one digital output to the fog light live wire that would previously be connected to the fog light switch so when the digital output is set the fog lights will turn on?

  2. #2
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    sorry forgot to add. as well as running a wire from the ground post to the ground on the switch.

  3. #3
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    To help illustrate what i am trying to achieve I have attached a wiring diagram for my electric windows. If i was wanting to control Switch-window-front-lh using the velleman what would i wire to where?
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  4. #4
    Maximum Bitrate DeltaFX's Avatar
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    Nope. Not directly. The digital outputs, according to velleman's doc allow max50v/100ma. DO NOT connect your fog lights directly. Want you need is a relay to switch your light.

    Connect the relay coil to +12 and output i. The K8055 uses ULN2803A so you need to connect the +12v to the "clamp" pin too. ANd connect "ground" to the ground

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    Thanks DeltaFX I thought there would be some sort of catch. Right OK so l think I've got the right idea can you confirm the following for me?

    I have attached a diagram from the manual which shows how to connect a relay.

    Forgive my ignorance but I presume the slashed rectangle is the relay coil?

    So are these the steps I need to take to wire digital output 1 to control the upwards motion of the front lh motor of one of the windows?

    1. Connect the GND connector of the velleman to the car chassis.
    2. Connect the Clamp of the velleman to the battery +
    3. Run a wire from the clamp line to one side of my new relay coil.
    4. From the other side of my new relay coil run a wire to the 1 pin on the velleman.


    So if i'm right in my thinking the steps above will cause the coil in my new relay to energise right so far?

    Next I need to wire the motor to the new relay? so which wire to the common and which to 87?

    Am I even remotely close?

    Thanks again for your help.
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  6. #6
    Maximum Bitrate DeltaFX's Avatar
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    You're perfectly right about wiring the coil part.

    Now that the coil is wired, you can look that relay like a simple switch. Basically a relay will have a common, a NO (normally Open) and maybe a NC (normally closed) pin.

    Concerning the motor, well... You have switches that swaps motor + & -, but what's that windows ECU ? What is that for ?

  7. #7
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    Was almost stumped as to what that was for but i think i've sussed it. On the drivers side window switch only (thats RH over here remember) If you press the up or down on the switch very briefly the window will lift fully up or down in one go so you don't need to hold it. So this mystery ECU box is allowing that functionality? The fact that it is only connected to the RH one leads me to think this.

    I am still not entirely sure how to wire the rest of the relay after wiring the coil. I just can't seem to see It on the diagram.

  8. #8
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    We seem to be making a little progress on the MG-Rover.org site (link to thread below) but have found a stumbling block with the window switch and the way it operates by reversing polarity. From what I can tell though the fog lights should be no problem at all. All this to save a bit of space on the dash eh?

    http://forums.mg-rover.org/showthread.php?t=78762

  9. #9
    Maximum Bitrate DeltaFX's Avatar
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    For the fog lights, its pretty straightforward :

    +12 Batt--->relay NO/-/relay Common--->Lights--->Ground.

    (Wire lights in // on the same relay or better use 2 relays).

    Auto-close for your passenger window is easy, you just need to by-pass the open/close switche with a double relay as you need to route both + & - lines. No Volt in the relay, no connections to the motor; Volt->relay closed--> the motor is powered for the right amount of time to close the window.

    For your driver seat, it's the same except you just need a brief contact to tell the ECU to close the window.

    Tip, if that windows-ECU is seperated from the switche itself, why not buying a second window-ECU for your passenger ?

  10. #10
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    Velleman K8055 help

    hi there i do`t think i am in the wright place but please can any one tell me how would i hook up some 12v dc lights or moters to this or 5v dc lights or moters

    from peter

    ps i am new to This usb thing

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