sense and trigger later

Discussion in 'The Projects Forum' started by seesoe, Apr 19, 2009.

  1. seesoe

    Thread Starter Active Member

    Dec 7, 2008
    99
    0
    i have a pneumatic valve like in this video http://hackedgadgets.com/2009/02/07/pneumatic-control-system/

    his trigger input is a little micro switch, and when he presses it everything moves and when he lets go everything goes back.

    i have the same pneumatic setup, but what im trying to do is change the timing on the button.

    i want everything to move x amount of seconds after the button is pressed. x being about a few seconds variable pot with variance of about a 5 second window.

    i was thinking some sort of timer and use a variable capacitor to set the timing.
     
    Last edited: Apr 19, 2009
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,170
    395
    If SW current is less than 200 mA @12V , you can use 2 555 timer IC's; first [ adjustable with pot.] gives X time, is cap. coupled to 2nd 555 which gives operating time. Drive pneumatic control with output of second.
     
  3. seesoe

    Thread Starter Active Member

    Dec 7, 2008
    99
    0
    hmm, im not sure what the voltage is, i highly doubt it is 12v.

    this is on a bakery machine that runs at 220v 60 cycle, there is just about no electronics in the panel, ill get more into the project Wednesday, i will get a volt meter and check out everything. till then thanks:)
     
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