Triple State status LED

Discussion in 'General Electronics Chat' started by Phillikl, Aug 13, 2012.

  1. Phillikl

    Thread Starter New Member

    Aug 13, 2012
    2
    0
    So, been racking my brain against the wall most of the day; and I have come to a stale-mate and need an assist.

    My Goal: Have a single LED show the state of 2 different power supplies.

    Example: RGB LED

    PS1 & PS2
    PS1 online
    PS2 online
    While the easy way out would be just apply an LED on the board for each power supply and call it a day. However, due to the footprint of the project, I am trying to keep all parts to an absolute bare minimum.

    Thanks for the assist!

    ~Kendall
     
  2. ramancini8

    Member

    Jul 18, 2012
    442
    118
    The quality of the answer depends greatly on the quality of the question. What are the power supply voltages, and need a spec on the led for starters.
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Get a bi color led, 3 leads, common cathode. Drive 1 led off PS1, other led off PS2.

    No supplys: leds off

    PS1 only: color 1

    PS1 only: color 2

    PS1 & PS2: color 1 and color 2.

    I don't recall how colors blend, but I believe a red/blue led will also glow orange with both on.

    You will have to be careful in resistor selection to get them to glow at proper intensities so the blended color shows true.
     
  4. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234

    You should have also mentioned to have a common ground between the 2 power supplies connected to the LED, so it will light from either one....;)
     
  5. Phillikl

    Thread Starter New Member

    Aug 13, 2012
    2
    0
    Thanks guys! Appreciate the response. That was the option I kept steering too, but for some reason was over thinking the entire scenario. Now that I have a second opion I can go blow some comps up! LOL

    Thanks again,

    ~Kendall
     
  6. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,392
    1,605
    That's always my favorite part of someone else's project!
     
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