Quote Originally Posted by Kalind View Post
there entire device has slowed down. temperature changes used to be instantaneous. going into the different menu's were instantaneous. for some odd reason every has slowed down.
So when you press a button it takes a bit for anything to happen?

I do not see anything obvious in you code other than it is doing a lot of things now that take time. Takes a little time to get back to the button. To make the buttons react faster you will want to explore interrupts.
About the amplification, wouldnt it affect the resolution of the measurement?
No.
The resolution is controlled by the ADC, 8 or 10 bit, and the VREF (voltage reference)
This link goes to a volt meter
http://rentron.com/serial.htm
but that is all a LM35 is (sort of)
Bruce has a good explanation about how to read a voltage and display it.