Light sensing A or B switch

Discussion in 'The Projects Forum' started by MercilessMike, May 31, 2013.

  1. MercilessMike

    Thread Starter New Member

    May 31, 2013
    2
    0
    I've racked my brain to come up with a simple 12VDC circuit to determine which strand of LED ribbon to turn on.
    Here's the plan:
    When here is ambient light (day time) and I open a door (reed switch) the High Output LED strand is turned on.
    When there is low light and door is opened, the red strand is turned on.

    I see using a photo resistor circuit, but the OR gate logic eludes me.


    Thank you for your time.
     
  2. LDC3

    Active Member

    Apr 27, 2013
    920
    160
    You want to use an AND gate, not an OR gate.
    1) Bright AND Door Opens
    2) Dim AND Door Opens
     
    MercilessMike likes this.
  3. MercilessMike

    Thread Starter New Member

    May 31, 2013
    2
    0
    My initial idea was the reed switch act as a power switch for the circuit since it will be running of SLA batteries. I could add in a charging system to the SLA's from a solar panel.
     
  4. LDC3

    Active Member

    Apr 27, 2013
    920
    160
    You can still use the door open to power the whole system. Your conditions then become a choice of
    1) Bright
    2) Dim
    True, it is now a choice of 1 or 2, but you will see that it is more like 1 or not 1. So your conditions are simpler than you thought.
     
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