do you have a schematic for the circuit?
i have a few of the ADC0808 chips (similar connection i think).

-Travis


>From: David russel 
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>To: PSN-L@..............
>Subject: homebrew data logging program
>Date: Sat, 5 May 2001 14:42:17 -0700
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>I've just completed an AtoD convertor using the ADC0809 eight bit
>convertor chip. I can address it and do data in/out from the Lpt1 port.
>It all works out Ok as electronics is my forte' but I'm a little weak in
>the programming department. I've come up with a program written in Quick
>Basic which is but a glorified three Channel
>oscilloscope. It uses PSET and LINE statements to graph it all out.
>I also have routines to scale the data from the ADC input and also
>control the horizonal sweep speed. The speed however is not calibrated to
>any thing.
>
>         How do I go about taking a reading twenty times a second ?
>and do all the other program house keeping without these other chores
>impacting the sampling rate ?
>
>         Is there an answer out there ?
>         singed, anxiety's child
>
>Casey
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