LM35 Temperature Sensor SEN21, R34

Description

The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling.

• Calibrated Directly in Celsius (Centigrade)
• Linear + 10-mV/°C Scale Factor
• 0.5°C Ensured Accuracy (at 25°C)
• Rated for 0°C  to 100°C Range
• Suitable for Remote Applications

Documents

Datasheet

Getting started with the LM35 Temperature Sensor

Now make your own temperature sensor by Arduino and LM35 Sensor

Hardware required

• Arduino Uno
• LM35 Temperature sensor
• Breadboard
• Jumper wire

Connecting the Hardware

Connect the LM35 Temperature Sensor to the arduino UNO as shown below.

UPLOAD THE FOLLOWING CODE ON ARDUINO BOARD.

// Define the analog pin, the LM35's Vout pin is connected to
#define sensorPin A0

void setup() {
// Begin serial communication at 9600 baud rate
Serial.begin(9600);
}

void loop() {
// Get the voltage reading from the LM35
int reading = analogRead(sensorPin);

// Convert that reading into voltage
// Replace 5.0 with 3.3, if you are using a 3.3V Arduino
float voltage = reading * (5.0 / 1024.0);

// Convert the voltage into the temperature in Celsius
float temperatureC = voltage * 100;

// Print the temperature in Celsius
Serial.print("Temperature: ");
Serial.print(temperatureC);
Serial.print("°C | ");

// Print the temperature in Fahrenheit
float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0;
Serial.print(temperatureF);
Serial.println("°F");

delay(1000); // wait a second between readings
}