// The TMP36's Vout pin is connected to A0 of Arduino 
#define analogPin A0 
  
// Connect ARef to 3.3V 
#define aref_voltage 3.3 
  
void setup() { 
  // Begin serial communication at 9600 baud rate 
  Serial.begin(9600); 
  
  // Set the aref to something other than 5v 
  analogReference(EXTERNAL); 
} 
  
void loop() { 
  // The voltage output reading from the TMP36 sensor 
  int sensorRead = analogRead(analogPin); 
  
  // Convert that sensor reading into voltage 
  float voltageOut = sensorRead * (aref_voltage / 1024.0); 
  
  // The voltage is then converted to temperature in Celsius 
  float tempInC = (voltageOut - 0.5) * 100; 
  
  // Print the temperature in Celsius in serial monitor 
  Serial.print("Temperature: "); 
  Serial.print(tempInC); 
  Serial.print("K"); 
  Serial.print("\n"); 
  
  delay(2000); // time in milliseconds to wait for the next reading 
}