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555 timer

  1. Jun 13, 2013 #1
    Hi i use the 555 alot and I am also a gamer.
    in the game "left4dead" they have a bomb that has an occilator to tell you when the bomb is going to go off bu blinking slowly at first, like 1hz then slowely increasing frequency up to maybe 10hz over somthing like a 10 second span. Does anyone know how to do this with a 555?

    Example
     
    Last edited by a moderator: Sep 25, 2014
  2. jcsd
  3. Jun 13, 2013 #2

    NascentOxygen

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    Staff: Mentor

    I don't have data to expend on a YouTube video ATM, but do you want the duty cycle fixed at about 50%, even at 1Hz?
     
  4. Jun 13, 2013 #3
    wait, ok i completely forgot something.
    I was messing around with the 555 trying to acomplish what I want but I have little or no Idea what the duty cycle is. I FEEL SO STUPID! lol is that saying the frequency will increase by 50% every 1 second or somthing?
     
  5. Jun 14, 2013 #4

    NascentOxygen

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    Staff: Mentor

    Duty cycle is the proportion of each cycle that the LED is lit. 50% duty cycle means it spends equal time ON as OFF.
     
  6. Jun 14, 2013 #5
  7. Jun 15, 2013 #6
    ok thanks guys
     
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