how can i use lm35 with arduino due

Other Hardware Sensors
1

firstly, i watched almost all videos about using lm35 but they all youtuber used arduino uno with m35 and im confused my temperature sensor read the temperature aproximately 48 celcius but at ambient temperature was 24 celcius :cry: (sorry for languague)

2

Hi, welcome to the forum.

Post the code you're using, and a connection diagram.
Leo..

3

well I have the same exact issue

below my code

const int pin0 = A0;
const int pin1 = A1;
const float aref = 1.1;
 
void readLM35(int analogpin) {
  Serial.print("***********  pin");
Serial.print(analogpin);


 int value = analogRead(analogpin); // read the value from the sensor

  float millivolts = (value / 1024.0) * 5000; 
  float celsius = millivolts / 10;

 Serial.print("  celsius = ");
  Serial.println(celsius);

 
}
 
void setup()
{
  Serial.begin(9600);

  
}
 
void loop()
{
  readLM35(pin0);
    readLM35(pin1);
  delay(1000);
}

and the attached is my connection diagram.

**also note when upload the same script with the same diagram in my Arduino Leonardo I get a correct measures from the sensors

Untitled Sketch 2_bb.jpg
Untitled Sketch 2_bb.jpg1878×1284 346 KB

4

Not familiar with the Leonardo or the Due.
But I see that default Aref on the Due is 3.3volt, and 5volt on the Leonardo.
So you will get different results.

const float aref = 1.1; Where are you using that.

float millivolts = (value / 1024.0) * 5000; That assumes Aref is 5volt.
Leo..

5

so I have to divide on 3300 instead of 5000?