Re: Reading serial port lines

From: Bjørge Sæther (bjorge_at_hahaha_itte.no)
Date: 10/14/04 

Date: Thu, 14 Oct 2004 00:22:34 +0200

AlanGLLoyd wrote:
> In article <36mpm0d86c4sto3n6b7m6e4fgsu91139vh@4ax.com>, L D Blake
> <not@any.adr> writes:
>
>> Don't put enough and it doesn't look like a short
>> during switch bounce,
>
> ie the voltage drops in the switch-bounce time to below the logic
> transition.
>
>> put too much (i.e. a ridiculously high value) and you
>> risk frying the switch contacts.
>
> One should have a small series resistor in the capacitor line (value
> of > supply voltage / max switch current) to obviate this..
>
>> Even a .01ufd capacitor can put up an amp of
>> current for a very brief period of time.
>
> If the capacitor is close to the switch I would think nearer 10 amps
> for 0.1 microsec, but that would not be enough energy to do harm.

To come with switch is bouncing one usually uses logic - blocking pulses for
a period of a few msecs through a "one-shot" circuit. If you want to do this
with passive components, you will have a very "non-digital" input - slowly
going from one logic level to the other. 

-- 
Regards,
Bjørge Sæther
bjorge@haha_itte.no
-------------------------------------
I'll not spend any money on American Software products
until armed forces are out of Iraq.

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