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Need help activating relay — Parallax Forums

Need help activating relay

cfarandacfaranda Posts: 8
edited 2004-09-03 20:09 in BASIC Stamp
I have 3 relays that are activated with a BS1.· For some reason one of them will not work.· I can see the pin toggling high and low with the button press but the transistor (2222A) does not go high.· I thought the transistor was bad so I replaced it, still not working.· Any clues?

TIA,
Chuck

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2004-09-03 18:47
    It would help to know how the relays are connected.· For example, what voltage are they?· How are the connected to the transistor?· Is the transistor base connected to the stamp pin through a resistor (It should be).



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    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    ·
  • cfarandacfaranda Posts: 8
    edited 2004-09-03 19:34
    Your post made me go back and check the 5 volt source for the relay.· I had a bad solder joint!!!· Talk about overlooking the obvious.·

    thanks

    Chuck
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2004-09-03 20:09
    No problem!· Sometimes when someone asks me an obvious thing, I remember that sometimes it's easy to overlook the obvious when you're doing this kinda stuff...Especially if you get frustrated easily.· Take Care!



    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    Designs Page:··· http://www.lightlink.com/dream/designs
    ·
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