piclist 2000\05\23\095515a >
Thread: Adjusting voltage output of a temperature sensor
face BY : Scott Dattalo email (remove spam text)

On Tue, 23 May 2000, Damon Hopkins wrote:

{Quote hidden}

Is it the op amp that's the problem or having to supply -ve? There are several
low-power, single-supply, rail-to-rail opamps in tiny SOT-23 sized packages that
would work nicely here.

All though I've never explored this, you could recover the A/D converter's
dynamic range by tying the LM335 to the 87x's vref pin and then measure a known
DC voltage source on one of the analog inputs. Perhaps two or three DC voltages
could be used as references. At first glance this would appear to prevent the
other analog inputs from being used. However, you could still switch the A/D to
use the power supply rails as the voltage reference.



In reply to: <392A08B8.597EA01@unity.ncsu.edu>
See also: www.piclist.com/techref/io/sensors.htm?key=temperature
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