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Do I need to insert a resistor to protect the Stamp, and if so what size? — Parallax Forums

Do I need to insert a resistor to protect the Stamp, and if so what size?

GuidoGuido Posts: 195
edited 2007-04-05 18:20 in BASIC Stamp
Well you all know I am not to bright....But I do try to learn! I am going to use three stamps and one LCD Display. One stamp will control the other Two as far as which one will take over the lucky duties of the Display! How would you advise protecting the Stamps and the Serial LCD?
Thanks
Guido

Post Edited By Moderator (Chris Savage (Parallax)) : 4/6/2007 5:38:19 AM GMT

Comments

  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2007-04-05 01:02
    pretty distastefully stated in the Topic header

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔


    It's Only A Stupid Question If You Have Not Googled It First!!
  • DufferDuffer Posts: 374
    edited 2007-04-05 01:22
    Guido,
    Protection is important in a project like you described. First, I would use saline (salt water) soaked sponges under each of the Stamp boards to isolate them from the nasty old ground, bypass the on-board voltage regulators (5 volts sounds a little wimpy for your project), get rid of those old DC wall wart power supplies and get yourself some good strong 12 volt AC units and "go for it"! Oh, and don't forget to wrap all of those little exposed metal parts (where all the wires go in) on the LDC with aluminum foil.
    Lastly, dial 9-1 on your phone and hit the power buttons on the boards.
    Good luck, Steve
  • T ChapT Chap Posts: 4,223
    edited 2007-04-05 01:34
    If the first two responses didn't quite get the point across, how about editing your thread with a new title that makes sense?
  • GuidoGuido Posts: 195
    edited 2007-04-05 18:11
    Do I need to insert a resistor to protect the Stamp, and if so what size?

    Just a little Humor guy's
  • allanlane5allanlane5 Posts: 3,815
    edited 2007-04-05 18:20
    No you probably don't need to protect the BS2 pins.

    But if you want to, 220 ohms in series will protect a stamp pin in the situation where you're command it to output a +5 and it's really connected to ground. 220 ohms will also protect a stamp pin when you're commanding it to zero and it's really connected to a +5 output.

    The Homework Board comes with these resistors pre-installed.

    And this is a family comment board. Comments about Trojan Rubbers are so obscure that it's not likely to be seen as funny.· Not to mention that using them for waterproofing is sometimes appropriate.· So you're either not funny, or confusing, neither of which is what you want.· Just a thought.
    ·
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