Strange pic 16f877a memory loss

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  1. - 2nd July 2009, 08:24 #1
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    Darrel, do you have your devices in metal enclosures?

    I had similar effects on devices placed in the car parkings and were exposed in the open. But were built in plastics...

    I wonder why the other electronics on-board still work, or not?

    Ioannis
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  2. - 2nd July 2009, 09:55 #2
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    Nope, they're in a NEMA4 PVC enclosure, although that enclosure is inside a metal frame.

    And when they do fess up, I've heard that Radar and navigation were knocked out too, but the radio's still work fine. (but who knows for sure)
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    DT
  3. - 2nd July 2009, 10:22 #3
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    I have had similar problems in machine shops around welders
    and plasma cutters. A metal enclosure with a good earth ground
    normally helps. Have to add another ground rod a lot of times.

    How do you earth ground a boat?
    Dave
    Always wear safety glasses while programming.
  4. - 2nd July 2009, 10:34 #4
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    Quote Originally Posted by mackrackit View Post
    ...

    How do you earth ground a boat?
    You wire a long cable to the shore

    If you can't find one long enough, use a wireless hub to make it. Everything goes wireless these days.
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
  5. - 2nd July 2009, 12:22 #5
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    Quote Originally Posted by mackrackit View Post
    How do you earth ground a boat?
    Hi, Dave

    No Problem ... Darrel's boat always stay along its Wharf ... Web Terminals do not work past the Harbour !!!


    You also could use the anchor ...

    BTW ... I thought sea water was conductive ... isn't it ???

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  6. - 2nd July 2009, 18:31 #6
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    Quote Originally Posted by mackrackit View Post
    How do you earth ground a boat?
    Boats usually have Zinc electrolysis plates on their bottoms to which all metal is grounded.
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  7. - 3rd July 2009, 16:59 #7
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    Quote Originally Posted by mackrackit View Post
    How do you earth ground a boat?
    run it up onto the beach...

    Sorry, couldn't resist...

    Seawater is conductive (depending on voltage) but also very corrosive...
    i think their is a metal (possibly zinc) strip to the bottom of a boats keel...

    As for using the anchor, you can't... corrosion on each individual chain loop will cause insulation...

    The fun comes when you try to figure out how to earth a plane...
  8. - 3rd July 2009, 19:00 #8
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    Quote Originally Posted by comwarrior View Post
    The fun comes when you try to figure out how to earth a plane...
    Hmm, and why should you? It is floating isn't it??

    Ioannis
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  9. - 3rd July 2009, 23:44 #9
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    lightning will still strike a plane...
  10. - 4th July 2009, 02:12 #10
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    Yes, but theoretically shouldn't do any damage as the aircraft is itself 'floating' and not connected to a 0v 'Ground'. The engines, chassis and all metal surfaces are bonded together along with busses to provide a local electrical return path. Composites (such as Carbon Fibres) usually (though not always) have an integral mesh or carrier strip which is bonded to the vehicle 'ground'. In flight it could be quite common for an aircraft to be charged at quite a high potential - so it's 'ground' is not at 0v, but some arbitrary 'floating' (pun intended) value.

    You could connect a PICs Vdd to several hundred kV (and happilly run it) - providing Vss is never more than say five volts lower than Vdd... I have an application for a domestic boiler Gas Ignition board using a PIC where Vdd is actially 0v (Ground) and Vss is -5v (it's easier then to use Comparators to detect if you have a flame as it creates negative ions). You can mess things around quite happilly providing you stay overall within the Datasheet parameters.
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