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Subject: Re: help TEMPERATURE sensor design help

Date: 08/16/00 at 7:26 AM
Posted by: Tom Allen
E-mail: tom.allen@nospamoceanfree.net
Message Posted:

In Reply to: help TEMPERATURE sensor design help posted by Brian Capehart on 08/11/00 at 11:13 PM:

The temperature range exceeds silicon thermometer chips so you will have to use a thermocouple either a type S or R

You will also need some signal conditioning circuit the easiest way is to use a dedicated chip like the LT1025

Then you will need a small microcontroller with an AD converter to take the output of the lt1025 and compare it to the min max temperatures

If you only have 2 permanently fixed hi lo temps you could use some form of analog window comparator circuit to change state however the microcontroller is more flexiable since you could fit dip switches to set various temp points or fit a keypad and display to allow the user to define his own

Tom Allen

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