frequency to Vdc converter

Archiver

Hi, anybody has a idea how to make a frequency to Vdc converter?
The input frequency is from 0 - 2 Hz, and the output is 0 - 10Vdc.
Thanks for the help. Happy Holidays

Hai

Archiver

>Hi, anybody has a idea how to make a frequency to Vdc converter?
>The input frequency is from 0 - 2 Hz, and the output is 0 - 10Vdc.
>Thanks for the help. Happy Holidays
>
>Hai

0 to 2 Hz is a very low frequency range. Can I assume that you want
to use a BASIC Stamp to do this?

On the input side...
method 1) COUNT for a long period of time, say 60 seconds, in order
to get 1% resolution.
Or, if the period is stable,
method 2) PULSIN to measure the high time and another PULSIN to
measure the low time, and add them up to get the total period within
one cycle. frequency=1/period

On the output side you would need a digital to analog converter,
possibly followed by an amplifier to bring the level to the 0-10 volt
spec.
method 1) PWM followed by an amplifier/buffer
method 2) digital potentiometer
method 3) serial DA converter chip

-- Tracy

Archiver

Thank you, Tracy. That is a good idea. Thanks again.
Happy Holidays

Hai

--- Tracy Allen <tracy@e...> wrote:
> >Hi, anybody has a idea how to make a frequency to
> Vdc converter?
> >The input frequency is from 0 - 2 Hz, and the
> output is 0 - 10Vdc.
> >Thanks for the help. Happy Holidays
> >
> >Hai
>
> 0 to 2 Hz is a very low frequency range. Can I
> assume that you want
> to use a BASIC Stamp to do this?
>
> On the input side...
> method 1) COUNT for a long period of time, say 60
> seconds, in order
> to get 1% resolution.
> Or, if the period is stable,
> method 2) PULSIN to measure the high time and
> another PULSIN to
> measure the low time, and add them up to get the
> total period within
> one cycle. frequency=1/period
>
> On the output side you would need a digital to
> analog converter,
> possibly followed by an amplifier to bring the level
> to the 0-10 volt
> spec.
> method 1) PWM followed by an amplifier/buffer
> method 2) digital potentiometer
> method 3) serial DA converter chip
>
> -- Tracy
>
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