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> How about a series arrangement instead of parallel? Wire four resistors
> in a 1/2/4/8 ratio in series, each of which can be shorted by one of the
> dip switches
>
> A quick spreadsheet shows that with the values in the ratio
>=20
> 1/2/4/8 + 16
>=20
> then the full scale value is about 48% of +V
> and the minumum delta between two adjacent values is about
> 1.7% of +V. This corresponds to about 17 ADC counts.

That arrangement is a little better than the 15 difference with parallel
resistors

Also, the circuit includes a PIC-driven voltage doubler (work in
progress, attached) for hard-pulsing a small solenoid valve, so that
could be used to power such a network with almost Vdd * 2 to
compensate for the loss and ~ double the difference

The coincidence comes about because this is for a small battery-
powered (3 x AA) butane injector. Interval1 is the injection time,
Interval2 is the mix time before spark. Once parameters have been
optimised (temperature might come into this too) in the test rig, the
resistors will be removed or rendered ineffective to save power in
the field

Joe

*
*
**********
Quality PIC programmers
http://www.embedinc.com/products/index.htm=

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