Hi!
On 07/04/2011 12:32 AM, WB6BNQ wrote:
Hi Don,
After Tom referred to the app note, I went and looked it up. While it is
functional I would, by no means, ever suggest anyone actually use that method.
It presents the possibility for personal injury and circuit failures. Even for
a
skilled veteran, all it takes is one thoughtless moment and you could have some
serious problems.
What surprises me is that ATMEL treated it so cavalierly and even allowed such a
publication. At the very least, the schematic should have had additional
treatment to indicate the seriousness and shown some method of the resistors
being physically mounted to a power plug that was protected from being touched.
They did mention the problem but just barely. Shame on them !
Bet their lawyers didn't get to approve it :)
Tom's approach of using a AC wall-wart is much safer.
Oh... and if you mess around you can toast your PC with Error 230,
that's when you burn out you PC with mains... I've seen it done.
Cheers,
Magnus
Bill....WB6BNQ
Don Latham wrote:
Here is at least one interesting possibility:
http://www.atmel.com/dyn/resources/prod_documents/doc2508.pdf
1 pps into another input to say your friendly Arduino, and a little
programming...
Don
Pete Lancashire
Someone mentioned a modern chip for detecting zero crossing.
I seem to have deleted it
Anyone have it ?
-pete
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--
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are as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
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