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Thread: 555 Timer for clicking a relay?

  1. #1
    Who am I? HiJackZX1's Avatar
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    555 Timer for clicking a relay?

    I have been trying to figure something out for my Color Digital Quad Processor for months. Basically when power is applied it defaults to a 4 Camera mode. The car will have 4 cameras, but I will rarely use the front facing cam. There for I want the DQP to switch to the 3 way mode, which is right, left and rear. The only way to do this is to press a button every time. I would like to automate this process. Basically when the car turns on, or power is applied, a timer simulates a less then one second pulse and then turns off. I have tried googling but cant seem to find a buy-able solution. All I see are on things to build the timer (which I cant do, ive tried) nothing as a complete unit. Maybe there is something else I can buy to do what I need? Any help would be helpful.
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  2. #2
    Vendor - Qube colin's Avatar
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    Search for "one shot timer". Thats the type of circuit you're looking for. You could probably do the same thing with a simple capacitor but the timer circuit is less prone to the interference in the power line from your car!

  3. #3
    What can I say? I like serial. Curiosity's Avatar
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    A resistor/capacitor + transistor should work fine depending on how the button sense circuit is set up. If accuracy is a problem you could run it off the internal power. Sort of like the old liliput auto-on hack. It may also need a delay after it turns on though.

  4. #4
    Who am I? HiJackZX1's Avatar
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    I decided not to worry about switching the DQP to 3 way mode because of this. http://www.youtube.com/watch?v=XLWZU3uKLlE That is Lacning and his front view cam. Seeing this has made me reconsider and simply display all 4 cameras, which it does by default.
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