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Automatic soap dispenser

Discussion in 'General Electronics Discussion' started by tnnelectro, Jun 25, 2020.

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  1. tnnelectro


    Apr 5, 2012
    I made the attached circuit to make an automatic soap dispenser ... it works well except that sometimes when the timed out ends and you take your hand from under the IR sensor the timed out is reactivated ...

    some advice? thank you.

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    The 2nd 555 is probably re-triggered by the movement of your hand.
    You can delay the onset of a second trigger by adding a third 555. The how to is described e.g. here (login required).
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