Thanks to all, I resolved my problem putting a 100nF capacitor between GND and LM35 Analog Signal, then I modified some values in the sketch and I also added a diode in the LM35.
Thanks to all, I resolved my problem putting a 100nF capacitor between GND and LM35 Analog Signal, then I modified some values in the sketch and I also added a diode in the LM35.