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'shift register recomendations'
1997\02\11@211853 by Tony Matthews

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Hi people
I need more pins! I need a 0~2 vdc dac an r2r buffered with an op amp I
guess.Also a 0~4 amp a/d with ~.1 amp resolution and six pins for an lcd
display,four pins for buttons and switches and two pins for digital
output.And I think I can pack the code into a 16c84 also my (homemade)
programmer is for a 84 and the algorithms themselves are simple and
there's no hurry slow is OK.Sooo.. Which shift register and adc would
you suggest keeping ready availability in quantities of one from usa
sources in mind.Thanks for your time. Tony M.

1997\02\11@233618 by tjaart

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Tony Matthews wrote:
>
> Hi people
>  I need more pins! I need a 0~2 vdc dac an r2r buffered with an op amp I
> guess.Also a 0~4 amp a/d with ~.1 amp resolution and six pins for an lcd
> display,four pins for buttons and switches and two pins for digital
> output.And I think I can pack the code into a 16c84 also my (homemade)
> programmer is for a 84 and the algorithms themselves are simple and
> there's no hurry slow is OK.Sooo.. Which shift register and adc would
> you suggest keeping ready availability in quantities of one from usa
> sources in mind.Thanks for your time. Tony M.

If you use IIC A/D's and a IIC LCD, you won't need any shift registers.
In fact,
you'll get away with 8 pins. Mabe even less code.

--
Friendly Regards

Tjaart van der Walt
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1997\02\12@133641 by Walter Banks

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Tony Matthews wrote:

>  I need more pins! I need a 0~2 vdc dac an r2r buffered with an op amp I
> guess.Also a 0~4 amp a/d with ~.1 amp resolution and six pins for an lcd
> display,four pins for buttons and switches and two pins for digital
> output.And I think I can pack the code into a 16c84 also my (homemade)
> programmer is for a 84 and the algorithms themselves are simple and
> there's no hurry slow is OK.Sooo.. Which shift register and adc would
> you suggest keeping ready availability in quantities of one from usa
> sources in mind.Thanks for your time. Tony M.

Why don't you use a PWM for the output and one of the summing
juction style a/d's. The A/D is slow but will give you about 12 bits
resolution with only two I/O pins. Besides it needs only two
resistors and a capacitor to implement.


Walter Banks
http://www.bytecraft.com

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