For Arduino Esplora. Uses built-in sensors to display room temperature.

FlashTemperature.ino

#include <Esplora.h>
//Press the Down button on joypad to display current temperature
//The red LED blinks the tens value, the blue blinks the ones value. Green indicates end.
//example: red red red blue blue green is 32 degrees (F)
//the light sensor is used to dim the LEDs in a brightly lit room

//copyleft Jan 01 13 www.gordonmeyer.com

// delay used to blink lights
int flashdelay = 250;


void setup(){
}

void loop() {
  if (Esplora.readButton(SWITCH_DOWN) == LOW) {
    getTemp();
  }
}

void getTemp() {
 int theTemp = (Esplora.readTemperature(DEGREES_F)); 
// Serial.print(theTemp);
 int theTens = (theTemp/10);
 for (int i = 0; i < theTens; i++) {
   flashRed();
 }
 int theOnes = (theTemp%10);
 Serial.print(theOnes);
 for (int i = 0; i < theOnes; i++) {
   flashBlue();
 }
 delay (flashdelay);
 int brt = (Esplora.readLightSensor()/10);
 Esplora.writeGreen(brt);
 delay (flashdelay);
 Esplora.writeRGB(0,0,0);
}

void flashRed() {
  // uses room brightness to set LED level
  int brt = (Esplora.readLightSensor()/10);
 // Serial.println("bright "); Serial.print(brt);
  Esplora.writeRed(brt);
  delay (flashdelay);
  Esplora.writeRGB(0,0,0);
  delay (flashdelay);
}

void flashBlue() {
  int brt = (Esplora.readLightSensor()/10);
  Esplora.writeBlue(brt);
  delay (flashdelay);
  Esplora.writeRGB(0,0,0);
  delay (flashdelay);
}