Photoelectric Day / Night fan speed controller

Discussion in 'The Projects Forum' started by strpdbas, Mar 20, 2009.

  1. strpdbas

    Thread Starter Active Member

    Dec 24, 2008
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    0
    Can someone help me with a circuit design for a variable speed fan controller that will change fan speed using a photocell. It would need to be able to have a variable speed control for both day and night time operation.
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    DC or AC fan motor? How many volts, how many amps or watts?
     
  3. strpdbas

    Thread Starter Active Member

    Dec 24, 2008
    99
    0
    Sorry about that. 115VAC, I think a max of 2 amps would be more than adequate. These are not very large motors, maybe 1/6 - 1/4 hp max.
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    How is the relation between day/night and the speed of the fans ?
    Must it be a light dependend speed regulation or high / low speed ?

    Greetings,
    Bertus
     
  5. strpdbas

    Thread Starter Active Member

    Dec 24, 2008
    99
    0
    The fans would typically run at a lower speed at night. I was asked by a friend about this device. My understanding is that he does not want to use a mechanical timer, but a photocell to actuate mode. He also asked that the speed of the motor must be adjustable in both the day and night modes of operation.
     
  6. LavaLite

    New Member

    Aug 18, 2009
    1
    0
    I was wondering if anyone had a answer to this question. Basically I want to power 2 dimmers/speed controllers with a photo cell, one dimmer on during light and one dimmer on during dark. It would control a 120v 3a attic vent fan, I want it to run at 75-100% speed during the day and 25% speed at night.
     
  7. jj_alukkas

    Well-Known Member

    Jan 8, 2009
    751
    5
    Its just a Hi-Low setup..
     
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