light dependant switch

Discussion in 'Homework Help' started by jomass, Feb 12, 2010.

  1. jomass

    Thread Starter New Member

    Feb 12, 2010
    2
    0
    hay i got a clock that cant be seen at the eve and from early day hour so i want to connect a source controlled by a light sensor to light when there r no enough light well how u can help me

    just give me the design or the ic to make it even if it has some additional things

    thanx
     
    Last edited by a moderator: Feb 12, 2010
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    If this is a homework question, you will have to show us what you have upto now.
    We will help you if you have troubles with parts of the solution.

    Greetings,
    Bertus
     
  3. kraudio7

    New Member

    Feb 12, 2010
    1
    0
    hey there jomass

    I'm pretty new to the forum here, but as Mr. Bertus said, you must show what you've done until now before we solve your problem.

    As being new here and to electronics, I can tell you I would use a MOSFET and an LDR. Can't say more or other wise I'll solve the exercise :D.

    Search for those and see if you can solve it!

    Good luck!
     
  4. ELECTRONERD

    Senior Member

    May 26, 2009
    1,146
    16
    Have you ever seen those automatic night lights? It uses as CdS cell to detect whether it's night or day. Depending on those conditions, it will then turn on the light at night time, and turn it off at day time. This is, in effect, the same requirements you need, correct?

    And no, I don't sleep with a night light! :D

    Austin
     
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