Re: Can I


<Triblesix@xxxxxxxxx> wrote in message
news:1155283208.132093.310090@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi ,

I designed a pulse generator which operate exactly the same way old
computer mouse mechanism works. (IR emmiter-sensor )
the requirment is to count number of pulse from A to D converter.
Is this possible with PWM and low pass filter arrangment ?



As I understand PWM, it's a scheme to vary pulse width based on the value of
an analog input. I don't see how that will help you to count pulses, but
maybe there's a way. What did you have in mind?

It's not obvious, to me at least, what you even mean by counting the number
of pulses out of an A/D converter. But . . .

If I wanted to count the number of pulses on a signal line, a counter like
the SN74163 would be my first thought. It will give you a multibit binary
representation of the number of pulses since the last reset. A variation on
this scheme uses decade counters like the SN74160 to output BCD, more easily
displayed on 7-segment LEDs.

If it's an analog voltage proportional to the pulse repeatition frequency
that you're after, you could have the pulse trigger a one-shot and
lowpass-filter the output to recover the average value. This only works well
when the ratio of maximum frequency to minimum frequency is fairly low.

Hope this helps.



.

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