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help please

Discussion in 'General Electronics Discussion' started by ian707, Feb 1, 2013.

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  1. ian707

    ian707

    4
    0
    Feb 1, 2013
    what i wanna do is like making it to on/off

    if you put coin the pc will automatically power on then when time ends its like you are pressing the power button to shut it off thank you very much...:D

    [​IMG]
     
  2. Miguel Lopez

    Miguel Lopez

    252
    63
    Jan 25, 2012
    LED and phototransistor (or integrated optocoupler) sensing the coin in two places.
     
  3. ian707

    ian707

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    0
    Feb 1, 2013
    what will i do sir...sorry for being so noob sir Lopes.

    thank you very much for replying.

    when i'm connecting the relay to motherboard of pc...it will turn on then shutdown after 3sec...what i wanna do is when time goes zero it will shutdown..
     
    Last edited: Feb 1, 2013
  4. davenn

    davenn Moderator

    13,833
    1,950
    Sep 5, 2009
    You are showing several circuit boards in your first post
    but we have no idea what those boards do
    you need to do some explaining ... links to info on those boards, circuit diagrams etc

    but basically you need
    1) a coin detector
    2) that will operate a timer circuit, that when it counts down the required time it will
    3) activate the PC power switch circuit

    Dave
     
  5. ian707

    ian707

    4
    0
    Feb 1, 2013
    sir i have a coin detector..i think the relay is my problem it is always alive i'm a total noob wew... :(

    [​IMG]


    what i wanna to happen is like i'm pressing the power botton when times start time end ^_^

    [​IMG]
     
    Last edited: Feb 1, 2013
  6. ian707

    ian707

    4
    0
    Feb 1, 2013
    help

    help help help ^_^
     
  7. Miguel Lopez

    Miguel Lopez

    252
    63
    Jan 25, 2012
    If you already have a coin detector, then the question is:

    What kind of signal that coin detector gives when it detects the coin? Can you tell us that?

    Using that signal (i.e: a digital level change) you could trigger a monostable (i.e: 555, 4047) and this monostable could power the relay for the desired time.
     
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