Arduino - Sensor Interfacing - LM35 Temperature Sensor- How To?

Arduino - Sensor Interfacing - LM35 Temperature Sensor- How To?

Working with Sensors - LM35

So lets get started with some sensors, LM35 is a simple temperature sensor. LM35 has 3 pins. Refer to the following image for the pin mappings

This is the LM35 as it looks

The LM35 pin Mapping. Note: The image on the left is a BOTTON view. This is how you will find it in the Product Datasheet 

Place the LM35 as shown

Connect Wires to Supply & Ground. Take a wire from the middle pin and connect it to Analog In 2 of the Arduino

Heres the finished Setup

Now time for the program. Try the following program.  Pressing the Button changes the current active color of the RGB LED & prints the current temperature value to the Serial Monitor and varying the trimpot changes the intensity of the color [RGB_button_lm35.ino]

/*
  Pressing the Button changes the current active color of the RGB LED & prints the current temperature value to the Serial Monitor
  and varying the trimpot changes the intensity of the color

 */

int intensity = 0, pin = 9;

void setup() {      
pinMode(2,INPUT);
Serial.begin(9600);
}

void loop() {
  
  if(digitalRead(2)==0) // Switch being pressed
  {
    Serial.print("Temperature is : ");
    int temp = analogRead(2)/2;
    Serial.println(temp);
     if(pin<11)
        pin++;
      else
        pin=9;
     analogWrite(9,0);
     analogWrite(10,0);
     analogWrite(11,0);
  while(digitalRead(2)==0);
  delay(100);
  }
  intensity = analogRead(0)/4;
  analogWrite(pin,intensity);
  Serial.print(pin);
  Serial.print("   ");
  Serial.println(intensity);
}