exa21

/*
example 2.1 - digital thermometer
Created 14/04/2010 ---  By John Boxall --- http://tronixstuff.com ---  CC by-sa v3.0
Uses an Analog Devices TMP36 temperature sensor to measure temperature and output values to the serial connection
Pin 1 of TMP36 to Arduino 5V power socket
Pin 2 of TMP36 to Arduino analog 0 socket
Pin 3 of TMP36 to Arduino GND socket
*/
void setup()
{
Serial.begin(9600);   // activate the serial output connection
}
float voltage = 0; // setup some variables
float sensor = 0;
float celsius = 0;
float fahrenheit = 0;
void loop()
{              // let's get measurin'
sensor = analogRead(0);
voltage = (sensor*5000)/1024; // convert raw sensor value to millivolts
voltage = voltage-400;        // remove voltage offset
celsius = voltage/10;         // convert millivolts to Celsius
fahrenheit = ((celsius * 1.8)+32); // convert celsius to fahrenheit
Serial.print("Temperature: ");
Serial.print(celsius,2);
Serial.println(" degrees C");
Serial.print("Temperature: ");
Serial.print(fahrenheit,2);
Serial.println(" degrees F");
Serial.println("_ _ _ _ _ _ _ _ _ _ _ _ _ _  ");
delay (1000); // wait a second, otherwise the serial monitor box will be too difficult to read
}