Wawa:
Please use code tags, so we all can see it without having to download/save it first.
Read the "How to post" sticky.temp= temp*(5.0*1000.0/1024.0);Reading an LM35 with default Aref and a 10-bit A/D gives you whole degrees at best (no meaningful decimal places).
And a temp display that depends on the supply voltage of the Arduino.Switch to the internal 1.1volt Aref, and your display will be more stable, with a 'real' resolution of ~0.1C.
Leo..float tempC;
void setup() {
Serial.begin(9600);
analogReference(INTERNAL); // use internal 1.1volt Aref
}
void loop() {
tempC = analogRead(A1) * 0.1039; // calibrate temp by changing the last digit(s) of "0.1039"
Serial.print("Temperature: ");
Serial.print(tempC, 1); // one decimal place is all you get
Serial.println(" °C");
delay(1000); // use a non-blocking delay when combined with other code
}
I change it but the value variation is still strange:
Temp.5 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 34.1 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 35.4 °C
Temperature: 35.3 °C
Temperature: 15.8 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 34.1 °C
Temperature: 35.5 °C
Temperature: 20.9 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 33.6 °C
Temperature: 35.7 °C
Temperature: 18.9 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 35.3 °C
Temperature: 34.7 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 36.5 °C
Temperature: 28.6 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 29.6 °C
Temperature: 35.8 °C
Temperature: 18.3 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 35.2 °C
Temperature: 35.3 °C
Temperature: 15.6 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 33.5 °C
Temperature: 35.1 °C
Temperature: 24.1 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 3.0 °C
Temperature: 36.3 °C
Temperature: 31.2 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 35.6 °C
Temperature: 31.8 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 13.1 °C
Temperature: 35.8 °C
Temperature: 20.3 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 35.6 °C
Temperature: 30.1 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 19.6 °C
Temperature: 35.6 °C
Temperature: 24.8 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 19.3 °C
Temperature: 36.4 °C
Temperature: 27.1 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 9.5 °C
Temperature: 35.6 °C
Temperature: 29.2 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 35.5 °C
Temperature: 34.7 °C
Temperature: 3.8 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 28.4 °C
Temperature: 35.5 °C
Temperature: 30.0 °C
Temperature: 0.0 °C
Temperature: 0.0 °C
Temperature: 0.0 °C