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Thread: wiring in "pilot" lights

  1. 27th March 2008, 03:05 PM #1
    B92 8NW
    B92 8NW is offline YarnMaster
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    wiring in "pilot" lights

    I'm building a control panel with a few power outlet plugs with separate switches for each one to run various accessories. I want two indicator lights for each outlet - a red pilot light and a green pilot light - the green to indicate that power is present but the switch is turned off - and red to indicate that it is turned on. Like sump pump controller systems in basements - when you turn the pump on the green light (usually labelled 'idle' or 'off') extinguishes and the red one comes on ('pump running').

    So basically I want each of the stable positions (on and off) indicated by a pilot light.

    Is it possible to achieve this neatly using relays or do I need to build a bistable multivibrator circuit for each outlet to control the warning lamps?
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  2. 27th March 2008, 03:14 PM #2
    PhilipA
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    I think its easy.
    Just get a A-B relay or switching relay and add it to the output side of the switch. No power =A (geen light), power =B (red light).
    Then wire the lights to earth from A and B.
    Regards Philip A
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  3. 27th March 2008, 03:18 PM #3
    B92 8NW
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    Quote Originally Posted by PhilipA View Post
    I think its easy.
    Just get a A-B relay or switching relay and add it to the output side of the switch. No power =A (geen light), power =B (red light).
    Then wire the lights to earth from A and B.
    Regards Philip A
    whoops!

    I thought I had it solved by using two relays - one normally closed and one normally open... totally forgot about a 5 pin relay. That's easy
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  4. 27th March 2008, 07:27 PM #4
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    JDNSW
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    In most cases it can be done even more simply - use a single pole double throw switch instead of an on/off switch - the "off" position switches on the power available light and the load on light simply parallelled with the load - no relays or anything else.

    John
    John

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  5. 27th March 2008, 08:27 PM #5
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    LandyAndy
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    Visit a Jaycar or Dick Smiths shop.
    You should be able to get a diy LED kit to do the job.LEDs use next to no power.
    Andrew
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