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Thread: Question on Arduino Solid State Relays triggering

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    Default Question on Arduino Solid State Relays triggering

    I'm running DCC sounded locomotives on a digitrax based loconet, and planning to automate a crossing intersection. My plan is to:

    1. use an arduino mega board & IR detectors to sense trains' arrival at intersection,
    2. drive a low-level triggered solid state relay to generate normal signals + a high-level triggered solid state relay to generate brake signals, via the arduino mega board, to the brake section
    3. use a digitrax booster to handle the brake section signals

    I'd like to know if I can use the SAME output pin from the arduino mega to drive both the low-level & the high-level relays, producing the effect of a SPDT switch. I used mechanical relays in the past. It worked, but its triggering noise was very annoying. On the other hand, solid state relays only support SPST and one has to double the number of relays to create the SPDT effect.

    Many Thanks for your advice.

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    Most ( all? ) solid state relays are just LEDs on the trigger side and a phototransister on the output side.

    The Arduino should have no problem driving more than one from a single output.
    For decoder installation and JMRI services, please visit http://www.bentraildigital.com
    For n-scale intermodal information, please visit http://nscaleintermodal.com

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    Thanks pbender,

    Are you saying solid state relays may not be able to handle a booster load of 12.7v at 8A from the Digitrax booster scaled to N?

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    Quote Originally Posted by KKL View Post
    Are you saying solid state relays may not be able to handle a booster load of 12.7v at 8A from the Digitrax booster scaled to N?
    All of the ones I have used have been in low voltage circuits, but what it can handle depends on the specific device. I don't know enough about what's out there to provide a good answer to that question.

    Paul
    For decoder installation and JMRI services, please visit http://www.bentraildigital.com
    For n-scale intermodal information, please visit http://nscaleintermodal.com

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