U can increase the accuracy of a lm35 sensor connected to your arduino by this method
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Well, not with this sketch.
I don't see any switching to the more stable 1.1volt Aref in setup.
As a result, you won't have a better resolution (temp steps) than 0.5 degrees C.
Switching to 1.1volt Aref could give you a more stable readout with 0.1C resolution.
float mean = (val/1023.0) * 5000;
A 10-bit A/D has 1024 steps, not 1023.
5000 assumes a 5.000volt VCC, which it rarely is.
Especially not when the Arduino is on USB supply.
Leo..
I would always do the math and put the factor in , to prevent the chance of unseen rounding and so you get the maths precision sensible .
1024/5000 =0.2048