On Tuesday 22 March 2005 04:16 am, michael brown scribbled:
> For my home temp logger, I use an LM34 and a Vref+ on my ADC of 1.024V.
> This gives me .1F (1mV) resolution (10 bit ADC) but a maximum temp of
> only 102.3F with a minimum of 0F.  I suppose that I could supply a Vref-
> value and slide the whole scale up a few degrees or use an op-amp to
> offset the output of the LM34, but my house should never be over 100F.


I was curious how you use a 1.024V reference (I'm assuming this is on a PIC), 
as PICs (16F872 as example) require a minimum Vref of about 2V.  Or are you 
measuring the reference itself as another input and comparing to the 
temp-sensor input?

Cheers,
-Neil.


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