Getting Started with Temperature Sensor (Celsius) (SN-LM35DZ)

Last Updated on 6 July 2017
This article is written by internship student Tian Fu Loke

INTRODUCTION

The LM35 temperature sensor is an integrated circuit sensor that gives an analog output proportional to the temperature in Celsius. You can download the datasheet here.

FEATURES

• Calibrated Directly in Celsius (Centigrade)
• Linear + 10-mV/°C Scale Factor
• 0.5°C Ensured Accuracy (at 25°C)
• Rated for Full −55°C to 150°C Range
• Suitable for Remote Applications
• Low-Cost Due to Wafer-Level Trimming
• Operates from 4 V to 30 V
• Less than 60-µA Current Drain
• Low Self-Heating, 0.08°C in Still Air
• Non-Linearity Only ±¼°C Typical
• Low-Impedance Output, 0.1 Ω for 1-mA Load

HARDWARE REQUIREMENT

• Arduino Uno/CT-UNO
• LM35 Temperature Sensor
• USB Cable
• Jumper Wires
• LED

SOFTWARE REQUIREMENT

Arduino IDE

HARDWARE SETUP

1. Take out your Arduino and components.
2. Build your LM35 temperature sensor on the breadboard.
3. Using jumper wire to connect between sensor and Arduino UNO/CT Uno
4. Connect the sensor Vcc to Arduino 5V, GND TO ARDUINO GND and the output pin connected to the analog pin of Arduino.

SAMPLE CODE

int ldrPin = 7;
int value = 0;
float voltage = 0;
float temp = 0;

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

void loop ()
{
value = analogRead(A0);      // sensor output to arduino analog A0 pin
voltage = value*0.00488;
temp = voltage*100;
Serial.print("TEMP:");
Serial.println(temp);

delay(500);
}

VIDEO

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