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Re: gEDA-user: Power relay question

On 07/28/2011 05:52 PM, Rob Butts wrote:

    This is a dumb question but I'm having a mental block.



    I have a 12 volt dc motor that I want to run from the push of
    a momentary pushbutton which will run until a limit switch gets hit.
    Digikey has a power latching relay PB1088-ND (cheap) that I can't tell
    if it actually latches once energized.  (I attached the relay document)

    Is relays and switches even the best/cheapest solution?  Suggestions?

    Power:

    quantity of 2 12 volt batteries available



    Input:

    momenary 12 volt pushbutton #1



    Requirements:

    12 volt dc motor #1

    12 volt dc motor #2


    The application:
    Stage 1: momentary signal from pushbutton #1 starts motor #1 that
    runs until a limit switch is hit triggering stage 2
    Stage 2: motor #2 runs until another limit switch is hit and remains
    stable
    Stage 3: momentary signal from pushbutton #1 reverses the polarity of
    power to the motor #2 running it until back to it's start position and
    triggering stage 4
    Stage 4: reverse of the ploarity of the power to motor #1 running it
    until it is back to the start position



    Thanks for any suggestions if non I'll just wing it.
I haven't thought this through, but what about a triac or some combo of triac and mosfet? 


gene


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