lm 35

LM 35TEMPERATURE SENSOR

Pin configuration

•LM35 is a basic temperature

sensor that can be used for

experimental purpose .

•It give the readings in centigrade

since its output voltage is linearly

proportional to temperature.

•For 10mv there will be 1 degree

change in temperature.

Principle of working

•A temperature sensor measures the

hotness or coolness of an object.

• The sensor's working base is the voltage

that's read across the diode.

• The temperature rises whenever the

voltage increases.

•The operating temperature range is from -

55°C to 150°C.

Connecting to arduino

codeint val;

int tempPin = 1;

void setup()

{Serial.begin(9600);

}

void loop()

{

val = analogRead(tempPin);float mv = ( val/1024.0)*5000;

float cel = mv/10;

Serial.print("TEMPRATURE = ");

Serial.print(cel);

Serial.print("*C");Serial.println();

delay(1000);

}

• 10 bit resolution=>2^10 divisions

5000mv=1024steps

?(x mv)=reading

x mv=5000*reading/1024

10mv=1 degree C change in temp

Temp=x mv/10

Serial monitor output

Queries?