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automated drink maker — Parallax Forums

automated drink maker

finleysfinleys Posts: 1
edited 2011-05-31 22:33 in BASIC Stamp
I am using a basic stamp 2 through a relay to turn a pump on and off at time intervals. The relay is flipping over which I know because it is audible and I also know that my pump works (tested). Am I grounding my pins incorrectly? any input would be GREATLY appreciated as I am at a complete loss.

circuit.jpg
circuit.jpg
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Comments

  • ercoerco Posts: 20,257
    edited 2011-05-31 22:33
    Doubtful that your relay is being activated by the Stamp. It may click yet not be making contact. An i/o pin can source 20 mA or sink 25 mA; your relay likely requires 100 mA or more to activate. You will need a transistor switch to activate your relay. You may have already damaged whatever i/o pin you hooked directly to your relay coil. See the last post in the sticky FAQ post on top of the Stamp forum for relay info.

    And check this out: http://www.youtube.com/watch?v=HTuYd1jhP5Y

    Been there, done that!
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