Re: PC based measurements

From: Don Taylor (dont_at_agora.rdrop.com)
Date: 07/09/04 

Date: Fri, 09 Jul 2004 01:21:36 -0500

Indroneel Ganguly wrote:
> Hello Everybody,
> I am trying to use my PC to measure resistance, capacitance and
> inductance of the
> respective components.
> I would like to use the parallel or serial port to do it.
> Do I need to have a ADC circuit to do it ?

I'm not usually happy when I say how I want to do something
and people immediately respond by telling me to throw away
everything I have and do it all differently, I'm really sorry,
but ANY chance you might have a sound card you could use instead?

If you put together a tiny oscillator with the frequency
controlled in part by the component you want to measure,
adjust the amplitude to be something the sound card likes.

And then you could use available software to show the
waveform, or software to measure the frequency, and from
that calculate the value of your component.

This might be easier than building an ADC or trying to get
control of the pins on the printer port so you can measure
pulse widths and/or frequencies.

And if you really need to use one of the other ports then
just ignore everything I said.

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