LED advice

Discussion in 'The Projects Forum' started by irozak, May 6, 2015.

  1. irozak

    Thread Starter New Member

    Apr 3, 2015
    3
    0
    I want to install a "door open" light for the shed some distance away. There is existing cabling and I found a spare pair of (cat5 type) wires so I've connected them to a magnetic switch on the door.
    At the other end of the wire I'm getting 28.5 ohms resistance when the door opens (switch closes).
    I have a 16v power supply that I can tap in to.
    What type of led, resistor, etc do I need to complete the job?
    Thanks
     
  2. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    1,438
    368
    If this is just a door open indicator you can use a 1k 1/2W resistor and an LED with a forward current in the 10 to 20mA range, i.e. any small, low power LED.
     
    Last edited: May 6, 2015
  3. irozak

    Thread Starter New Member

    Apr 3, 2015
    3
    0
    Thanks
     
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