LM35 and instability below 6 degree...

[synsyn]

Hi AvionicsMaster1,
For my measurement i have used a professional laboratory PSU.
For my experiment i have used a pic16f676 on a breadboard and with a direct connection to LM35.
When i try to read the output voltage from LM35, i make a minimun of 32 ADC lecture and take out the middle, and it work very good if the temperature stay around 10 degree but when it falling down under this value i get more instability in reading the voltage output from the sensor. Instead if i try to read the output with a multimeter i get alway a stable meause.
In the weekend i will try with a different circuit and with a different PIC sample.
In anyway for the future i will use a DS1820 chip for avoid any problems and for simply use of it with any kind of PIC.

[AvionicsMaster1]

If I understand you correctly, if the voltage is steady using a voltmeter to read the LM35 output but your readings once massaged thru the PIC are unstable then I'd blame the code or the inability of the PIC to read the output.

In post #2 Acetronics says you are very close to minimum reading and that may be the case. He also suggests a different sensor which may be what you have to do to get an accurate reading.