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The Professional Development Board mounted in side a double compartment fishing — Parallax Forums

The Professional Development Board mounted in side a double compartment fishing

allieallie Posts: 109
edited 2008-06-03 23:45 in General Discussion
·Hi all

·I just moved this project from the basic stamp forum,there it was titled, need info on anti-static mat.
·I just glued a cut section of the anti-static mat to the in side of the cover where the PDB will be mounted.
·It takes 24 hours for the glue to cure.
·I'll try to show some pictures later.

·alliesmile.gif

Comments

  • parts-man73parts-man73 Posts: 830
    edited 2008-05-20 02:26
    One tip. Many years ago, I decided to mount a piece of black foam, the type that IC's come mounted in under a circuit board. I screwed the board down tight against it. I had hoped it would cushion the board and help with vibration. I then had all sorts of problems with the circuit.I un-mounted the board, tested it again and it worked fine. Remounted it, and the problems came back.

    To make a long story short....another name for the anti-static foam is "conductive" foam. And it does conduct! If the bare backside of a circuit board is touching it, you will have problems.

    Lesson learned that day.

    I hope the "anti-static mat" you are referring to is a different type of material.

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    Brian

    uController.com - home of SpinStudio - the modular Development system for the Propeller

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  • allieallie Posts: 109
    edited 2008-05-20 08:58
    ·Thanks for the reply. Yes,I realize that it would not work well to press the circuit board tight against any conductive surface.

    ·The cpu anti-static mat which I'm using isn't showing any resistance at all with an ohm-meter reading(please check out my post on this, on the basic stamp forum, titled "need info on anti-static mat".

    ·The PDB which I mounted has rubber mounting pads glued under the circuit board and has a clearance of about·· 1/4 inch from the anti-static mat. I'm not sure if the mat is going to do any good or not, but I can not see it doing any harm. I may as well use it here because It,s not what I though it would be, when I bought it for a work mat. It has a ground strap on it so I,ll use it for this project.

    ·If the mat is good enough to set a cpu on, it should be all right under the PDB, to keep static charge from building up.

    ·regards alliesmurf.gif
  • tedbeautedbeau Posts: 48
    edited 2008-05-21 13:56
    Allie I dont know if you ever got any suggestions for eliminating the static cling of th eplastic chips created when you cut out the dividers. I would suggest you try static guard spray used to iron clothes. Spary a light coating on the tackle box. Another method would be to try wiping with a dryer sheet. Both items are designed to remove static cling.

    Ted
  • tedbeautedbeau Posts: 48
    edited 2008-05-21 14:00
    parts man 73 said...
    To make a long story short....another name for the anti-static foam is "conductive" foam. And it does conduct! If the bare backside of a circuit board is touching it, you will have problems
    I have actually seen a stamp project where they use the conductive foam as a pressure sensitive switch. Apparently it conducts more when compressed, (I think that was the jist of the project).

    An interesting idea to be sure. If anyone is interested I can look up the project and post here.


    Ted
  • allieallie Posts: 109
    edited 2008-05-30 22:42
    ·Thanks for the reply.

    ·There is no part of the circuit boards bottom, near the anti-static mat. There is a 1/4 inch space·from the bottom of the board and the mat. The board is mounted on rubber feet.

    ·I washed the tackle box with soap and water and it seems to be static free, but I will try the suggestions that you posted above.

    ·Thanks for advice.

    ·Allie
  • allieallie Posts: 109
    edited 2008-06-03 01:25
    Hello again, I,m including some pictures with this project.
    DSC00105.JPG
    320 x 240 - 15K
    DSC00106.JPG
    320 x 240 - 14K
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    DSC00110.JPG
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  • allieallie Posts: 109
    edited 2008-06-03 23:45
    ·A point which has to be mentioned. In the pictures of the last post you may notice, on the breadboard part of the PDB, I drilled 4 holes on the corners of the breadboard and installed 4 screws through the cover through the breadboard. I know that on the bottom of the PDB there are no traces where the screws are but I'm not sure about the top of the PDB circuit traces. I notice that there is no connection between the two vdd sockets·(x20 and x26) after I drilled the breadboard. I didn't check before I drilled so may be there is suppose to be a connection between these two connectors. I my self am not to concerned about this because I'll just jump a couple of wires across these connections if need be.

    ·But I needed to mention this. If any one else drills these, do it at your own risk.
    · I also used plastic screws which I threaded my self for the fasteners. I didn't want to take a chance of shorting out the PDB with medal screws.


    My PDB is newley purchased with a 2007 REV D stamped on it.

    allie

    Post Edited (allie) : 6/4/2008 12:17:21 AM GMT
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