Homer J Simpson wrote:
wrote in message
oups.com...


I need a unit that can detect a downward change in temperature which
can be adjustable in the area of 31 degrees F. The trip point must be
accurate to one degree or better.


That's tough.






What are you trying to use it for? You could try a Dallas DS1822 or
related part and a microcontroller such as a Pic or AVR, that hardware
will be cheap and should meet your specs but it will require some
firmware to be written.