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Component Advice — Parallax Forums

Component Advice

addaadda Posts: 13
edited 2007-03-18 21:31 in BASIC Stamp
I'd appreciate some advice regarding the following:

1.· I want to trigger a solenoid·(that has an·independent power supply) with a basic stamp 2·on a BOE.· The solenoid takes 12V 130 watts.· I'm looking for a low cost component that I can open/close with the stamp to complete the power supply circuit for the solenoid.

2.· I have multiple solenoids that I would like to power with one power supply.· I would like to find some type of· off the self IC with screw down connectors that will take a single power input and provide multiple power outputs at the other end (also screw down connectors).· This is the IC equivalent a multi outlet power·strip.


Thanks.

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2007-03-18 19:12
    1) Jameco carries an MOSFET rated for 100A at up to 30V that can be switched by a Stamp I/O pin (www.jameco.com/Jameco/Products/ProdDS/670291IR.pdf

    2) If your solenoids are all similar in power requirements, you will need a quality power supply much more than just an IC. Have a look at Jameco's on-line catalog. They have a wide selection of power supplies with power ratings up to 600 watts.

    3) You're talking about a lot of current here. Switching noise and ground loops are going to be a problem. If you don't have experience in designing systems with multiples of 10 amps of current being switched into inductive loads (the solenoids), you should get professional help.

    4) Jameco (and others) also have some small high-current relays that can help provide the isolation you may need. There are one or two relays in their catalog with 15A contact ratings that could control your solenoid, run off a separate 12V supply, and only need about 30ma of coil current, easily switched by a cheap switching transistor. The "What's a Microcontroller?" and "StampWorks" tutorials in Parallax's Stamps in Class downloads area show examples of this.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2007-03-18 19:38
    For driving multiple relay coils, you might take a look at the DC-16 Output Expander offered by EFX-TEK. It's reasonably priced and uses a serial connection to your BASIC Stamp, so you won't be using up a lot of pins.

    -Phil
  • Mike GreenMike Green Posts: 23,101
    edited 2007-03-18 19:57
    The DC-16 is a good idea, but it can't switch the kind of current (10A) needed by your solenoid. It could directly control an intermediate relay like I mentioned (in #4).
  • T ChapT Chap Posts: 4,223
    edited 2007-03-18 21:31
    There are many options here for AC and DC switching from logic, something may suit your needs. The DC units are near the bottom. Find a suitable votage range part and click the part number for specs. If you found a part that suited the current requirements, you'd only have to add the ternimal block.

    www.opto22.com/site/pr_cat_sc.aspx?qs=100310071003

    Post Edited (originator) : 3/18/2007 9:42:30 PM GMT
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