bulding timmer for ~ 10 min

Discussion in 'The Projects Forum' started by david1234, Jan 26, 2014.

  1. david1234

    Thread Starter Member

    Nov 27, 2013
    I want to built a circuit that when ever I start it - it will work for 10 min~
    (I want to set the time alone , so if tomorrow I want to change the time to 5 min - I will have to change only the R and C).
    the sensor output is "1" at work and "0" at normal state (no move\no sound...)

    I have read about this IC - ICM7250 ,but I didn't understand how do I calculate the time ?
    and also how does it now to stop after 10 units of 1 min?

    if someone have a better idea I will happy to hear

    Thanks ,
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    How repeatable do you want the time interval (10min+-X% on any given interval setting)?
    How accurate do you want a "dial" which allows time interval setting?
    What are you switching at the output (relay, lamp, LED, motor)?

    Have you seen these?