Temperature sensor + Leds

hello!
i came idea use temperature sensor , leds indicate temperature value. found ladyada-s tutorial http://www.ladyada.net/learn/sensors/tmp36.html, , want add leds, when temperature under 0 degrees blue led on, when temp over 0 degrees green led on , when over 20 degrees red led on. have no idea, how integrate leds temperature code. maybe here can help..

code: [select]



//tmp36 pin variables
int sensorpin = 0; //the analog pin tmp36's vout (sense) pin connected to
                       //the resolution 10 mv / degree centigrade a
                       //500 mv offset allow negative temperatures

#define bandgapref 14   // special indicator want measure bandgap

/*
* setup() - function runs once when turn arduino on
* initialize serial connection computer
*/
void setup()
{
 serial.begin(9600);  //start serial connection computer
                      //to view result open serial monitor
 delay(500);
}

void loop()                     // run on , on again
{
 // voltage reading secret internal 1.05v reference
 int refreading = analogread(bandgapref);  
 serial.println(refreading);
 
 // calculate our power supply voltage known 1.05 volt reading
 float supplyvoltage = (1.05 * 1024) / refreading;
 serial.print(supplyvoltage); serial.println("v power supply");
 
 //getting voltage reading temperature sensor
 int reading = analogread(sensorpin);  

 // converting reading voltage
 float voltage = reading * supplyvoltage / 1024;

 // print out voltage
 serial.print(voltage); serial.println(" volts");

 // print out temperature
 float temperaturec = (voltage - 0.5) * 100 ;   //converting 10 mv per degree wit 500 mv offset
                                              //to degrees ((volatge - 500mv) times 100)
 serial.print(temperaturec); serial.println(" degress c");

 // convert fahrenheight
 float temperaturef = (temperaturec * 9 / 5) + 32;
 serial.print(temperaturef); serial.println(" degress f");

 delay(1000);                                     //waiting second
}




http://arduino.cc/en/reference/if


sp. "degrees"  

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