TEMPERATURE SENSOR WITH ARDUINO

  LM35 ARDUINO

Components Required:-

1. LM-35:-

2. Arduino UNO:-

LM35:-It is a temperature sensor whose voltage varies as temperature increases or decreases. With 1° C change in temperature, there is a change of 10 millivolts therefore if temperature rises by 1 degree then 10 millivolts will be added similarly if temperature is reduced by 1 degree then 10 millivolts will be reduced.

Summary in mathematical equation:-

1°C = 10mV

LM35 PINOUT

1. GND PIN- connected to GND pin of Arduino.

2. OUTPUT– it is an output pin.

3. VCC PIN-  connected to VCC pin of Arduino.

  LM35 INTERFACING WITH ARDUINO

• First we have to connect VCC pin of Arduino to 1st terminal of LM35. 

• Then we have to connect 2nd pin of LM35 to A0 pin of Arduino. 

• Then connect GND pin of Arduino to 3rd pin of LM35.

ARDUINO CODE

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char input;

float temperature;

void setup() 

{

  pinMode(A0,INPUT);

  Serial.begin(9600);

}

void loop()

{

 temperature=0.48828125 * analogRead(A0);

 input=Serial.read();

 if (input=='t')

 {

  if (temperature>48)

  {

    Serial.println(" It's too hot");

  }

   else if(temperature<20)

   {

     Serial.println(" It's too cold");

   }

   else

   {

     Serial.println("It's normal temperature");

   }

 }

   delay(100);

}

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To learn this project in more detail, click here or on this picture to watch on YouTube.