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  • Very, very good

    posted by MildLeeIntrstd on 06/14/2012

    Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month


    Very easy to understand use.
    5v circuit includes current limiting resistors, so you can run this directly from a microprocessor.
    12V relay coil circuit includes "flyback" diodes for suppression of back EMF spikes.
    Well built.


    No circuit diagram, connection diagram or similar provided, which may cause problems for beginners.


    + 12Vdc supply for driving relay coils goes to "VCC" pin.
    0V for this circuit goes to "GND" pin.

    +5Vdc on any of the input pins will switch the associated relay. 0V for this circuit goes on the "COM" pin.

    "COM" and "GND" can be linked with the supplied jumper. I have used a common ground rail to run two of these modules with a microcontroller sharing the same ground rail with no problems.


    Be careful that you understand the required circuit to run the relays. You need to SOURCE +5V onto an input pin to run that relay and COM is your 0V. You do NOT put +5V on the common and SINK the inputs to ground.

    • Smart-wired kids cubby house.  Geek Nirvana!

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