Write a program in Arduino to interface a temperature sensor (LM35) to detect the temperature of a room.
Last Updated : 16 Jul 2025
Solution:
const int lm35 = A2; // LM35 temperature sensor connected to analog pin A2
void setup(){
Serial.begin(9600); // Initialize serial communication at 9600 baud rate
}
void loop(){
int adcvalue = analogRead(lm35); // Read the ADC value from the LM35
float tempVoltage = adcvalue * 4.88; // Convert the ADC value to voltage (assuming 5V reference)
float tempval = tempVoltage / 10; // Convert voltage to temperature (LM35: 10mV per °C)
Serial.print(tempval); // Print the temperature value to the serial monitor
Serial.println(" °C"); // Print the unit (°C)
delay(2000); // Wait for 2 seconds before taking the next reading
}
Meanwhile you can watch this video
Watch Video