Not in use sensor

Discussion in 'The Projects Forum' started by nathomas, Apr 18, 2011.

  1. nathomas

    Thread Starter Member

    Mar 3, 2011
    82
    0
    My application here requires the heating element to shut off after a while of idleness..And I need to initially adjust that time. I know I need a timer but I need a system which detects inactivity in the circuit. Something very similar to a cloth iron auto off feature.

    Thoughts and ideas would be appreciated.
     
  2. nathomas

    Thread Starter Member

    Mar 3, 2011
    82
    0
    I am not using any microprocessor or controller.!
     
  3. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
    define "inactivity" as it relates to your circuit...
     
  4. nathomas

    Thread Starter Member

    Mar 3, 2011
    82
    0
  5. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
    You could definitely use that device or anything in the 555 timer family. Look for monostable operation in the data sheet.
     
  6. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    30 minutes is kind of a long time for a 555 timer. Capacitor leakage will cause problems.
     
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