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Trouble controlling two lights with relays

Discussion in 'Electronic Basics' started by Chris, Sep 20, 2003.

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  1. Chris

    Chris Guest

    Hello,

    I'm trying to make a device that controls two lights. There are two
    switches and each controls one of the lights (i.e. SW1 controls LED1).

    So, if SW1 is pressed, LED1 will turn on. A second press of SW1 will
    deactivate LED1.

    Also, I never want both lights to be on at the same time.

    If SW2 is pressed while LED1 is on, LED1 will turn off and LED2 will
    turn on. A second press of SW2 will deactivate LED2.

    I plan to use momentary tact switches, so the latching can't come from
    something like toggle switches.

    And for more fun: if the power goes out, I don't want either lights to
    be on when the power comes back on.

    I've been trying to make it work with relays (without any luck). Has
    anyone tried this before? Any help would be greatly appreciated.

    Thanks in advance,
    Chris Kirchen
     
  2. CFoley1064

    CFoley1064 Guest

    I've been trying to make it work with relays (without any luck). Has
    This should work, although it's almost certainly not the most efficient
    solution. View in fixed font:

    + -
    | SW 1 |
    | T C1 |
    | --- +|| RY A |
    |-o o-------------||----------------------------------( )-------|
    | || |
    | |
    | CRY A CRY C RY B |
    |-----| |-----| |-------------------------------------( )-------|
    | |
    | CRY A CRY B CRY F RY C |
    |-----| |---o-|/|----------|/|------------------------( )-------|
    | | |
    | CRY C | |
    |-----| |---' |
    | |
    | SW 2 |
    | T C2 |
    | --- +|| RY D |
    |-o o-------------||----------------------------------( )-------|
    | || |
    | |
    | CRY D CRY F RY E |
    |-----| |-----| |-------------------------------------( )-------|
    | |
    | CRY D CRY E CRY C RY F |
    |-----| |---o-|/|----------|/|------------------------( )-------|
    | | |
    | CRY F | |
    |-----| |---' |
    | CRY C LED 1 |
    |----------------| |----------------------->|-------------------|
    | |
    | |
    | CRY D LED 2 |
    |----------------| |----------------------->|-------------------|
    | |

    created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

    A few tricks to this one -- it works only with DC, you'll have to play with the
    value of C1/C2 to get as brief a pulse as will work, and you need a 4-pole
    relay for RY C and RY F. Use two relays if you need to.

    This isn't the most efficient system, but it will work. Digital logic next
    time, okay?

    Good luck.
    Chris
     
  3. CFoley1064

    CFoley1064 Guest

    This should work

    Ooops. Forgot a few things. If you're using a cap as a one-shot former, you
    need to wrap a resistor (say, 22K) around it to allow the cap to discharge.
    Also, you need series resistors for the LEDs. Here's a quick mod on the above
    ckt (read in fixed font)


    + -
    | |
    | |
    | ___ |
    | -|___|- |
    | SW 1 | | |
    | T | C1 | |
    | --- | +|| | RY A |
    |-o o-------------||----------------------------------( )-------|
    | || |
    | |
    | CRY A CRY C RY B |
    |-----| |-----| |-------------------------------------( )-------|
    | |
    | CRY A CRY B CRY F RY C |
    |-----| |---o-|/|----------|/|------------------------( )-------|
    | | |
    | CRY C | |
    |-----| |---' |
    | |
    | ___ |
    | -|___|- |
    | SW 2 | | |
    | T | C2 | |
    | --- | +|| | RY D |
    |-o o-------------||----------------------------------( )-------|
    | || |
    | |
    | CRY D CRY F RY E |
    |-----| |-----| |-------------------------------------( )-------|
    | |
    | CRY D CRY E CRY C RY F |
    |-----| |---o-|/|----------|/|------------------------( )-------|
    | | |
    | CRY F | |
    |-----| |---' |
    | CRY C ___ LED 1 |
    |----------------| |-------|___|----------->|-------------------|
    | |
    | |
    | CRY D ___ LED 2 |
    |----------------| |-------|___|----------->|-------------------|
    | |

    created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

    Good luck.
    Chris
     
  4. John Fields

    John Fields Guest

     
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