Interfacing LM35 Temperature Sensor with Arduino Uno

In this blog, we will be discussing interfacing LM35 temperature sensor with Arduino Uno.

# Sensor Data Sheet:

Working Voltage:           5V
Working Current:           60 microAmperes
Range:                            -55 to 120 ( in Degree Celcius )
Scale Factor:                  0.01V/Degree Celcius

# Pin-Out:

Vcc = 5V ... Power Supply Pin
Output pin = for taking the sensor reading
Gnd ... Power Supply Pin

# Arduino Connection:

# Working:

LM35 Temperature Sensor basically works on the principle of change in resistance with temperature.


# Arduino Code:

int sensor = A0;  //define your analog input pin here

void setup() {

  pinMode(sensor,INPUT);
  Serial.begin(9600);

}

void loop() {

  float a = analogRead(sensor); 
  float b = (5*a*100)/1024;
  
  //here we are converting the volts(data from sensor) into temperature(degree celcius)
  //the analog pin provides the input in form of 10 bits....i.e. from 0 to 1023
  //so it needs to be converted into float...
  //5 is used bcoz 5V is applied as Vcc to the LM35 sensor
  
  Serial.println("Temperature is: ");
  Serial.print(b);
  Serial.print(" in Celcius.");
  delay(250);
  
}

# Applications:

1. To measure the temperature


To download the code click here