Did you mean +2.0V and +3.0V ?  Which PIC?  I remember some PICs require 2.0V 
minimum separation between Vref+ and Vref-.

Cheers,
-Neil.



On Sunday 02 October 2005 01:39 pm, Wouter van Ooijen scribbled:
> Part II of my most stupid [PIC] mistakes.
>
> I am trying to read an ADXL two-axis accelerometer. It outputs 2.5V +/-
> 0.3V, so to increase the A/D resolution I use 2.0 as -ref and 3.0 as
> +ref. But I only got either 000 or 3FF as A/D reading. I was totally
> flabbergasted, untill I re-checked which pin is -ref and which +ref. I
> had of course switched the pins.
>
> Wouter van Ooijen
>
> -- -------------------------------------------
> Van Ooijen Technische Informatica: www.voti.nl
> consultancy, development, PICmicro products
> docent Hogeschool van Utrecht: www.voti.nl/hvu


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