Difference between revisions of "9 What is temperature there? with LM35"

/*
 What is temperature there with LM35
 
 Reads an Temperature with LM35 Sensor .
 Also prints the results to the serial monitor.
 
 The circuit:
 * LM35 is connected to analog pin 0.
   Center pin of the LM35 goes to the analog pin.
   side pins of the LM35 go to +5V and ground
 * LED connected from digital pin 9 to ground(If required)
 
 */
// These constants won't change.  They're used to give names
// to the pins used:
const int analogInPin = A0;  // Analog input pin that the LM35 is attached to
const int analogOutPin = 9; // Analog output pin that the LED is attached to
int sensorValue = 0;        // value read from the LM35
int outputValue = 0;        // value output to the PWM (analog out)
void setup() {
  // initialize serial communications at 9600 bps:
  Serial.begin(9600); 
}
void loop() {
  // read the analog in value:
  sensorValue = analogRead(analogInPin);            
  // map it to the range of the analog out:
  outputValue = map(sensorValue, 0, 1023, 0, 255);  
  // change the analog out value:
  analogWrite(analogOutPin, outputValue);           
  // print the results to the serial monitor:
  Serial.print("Voltage in mV = " );                       
  Serial.print(sensorValue*5);      
  Serial.print("\t Temperature in Degree Celsius = ");      
  Serial.println(outputValue*2);   
  // wait 2 milliseconds before the next loop
  // for the analog-to-digital converter to settle
  // after the last reading:
  delay(2);                     
}