| Light Equalizer by Ana Lucía Martínez Arias Demosntrates how to connect and use a SHARP GP2D12 and GP2D120 infrared ranger sensor. Interprets distance from the ranger sensor value turning On a number of lights accordingly. The LEDs are connected to the digital pins 0 to 9 Created 13 Oct 2005 Revised 4 April 2007 |

    // Light Equalizer
    // by Ana Lucía Martínez Arias

    int distance=0;
    int i=0;

    void turn_all_off()            // function to turn off all the lights
    {
      int i;
      for(i=0; i<10; i++)		//LEDS connected to digital pins 0 to 9
      {
        digitalWrite(i, LOW);
      }
    }

    void setup(){
      Serial.begin(9600);	// sets the serial port to 9600
      for (i=0; i<10; i++){
        pinMode(i, OUTPUT);
      }
      pinMode(48,OUTPUT);
      digitalWrite(48,HIGH);
    }

    void loop(){
      turn_all_off();            // turns all lights off
      distance = analogRead(0);  // sensor connected to analog pin 0
      Serial.println(distance, DEC);  // prints the value read from the sensor

      if((distance>50)){
        digitalWrite(0, HIGH);   // sets the current light on
      }

      if((distance>100)){
        digitalWrite(1, HIGH);   // sets the current light on
      }

      if((distance>150)){
        digitalWrite(2, HIGH);   // sets the current light on
      }

      if((distance>200)){
        digitalWrite(3, HIGH);   // sets the current light on
      }

      if((distance>250)){
        digitalWrite(4, HIGH);   // sets the current light on
      }

      if((distance>300)){
        digitalWrite(5, HIGH);   // sets the current light on
      }

      if((distance>350)){
        digitalWrite(6, HIGH);   // sets the current light on
      }

      if((distance>400)){
        digitalWrite(7, HIGH);   // sets the current light on
      }

      if((distance>450)){
        digitalWrite(8, HIGH);   // sets the current light on
      }

      if((distance>500)){
        digitalWrite(9, HIGH);   // sets the current light on
      }

      delay(50);
    }

|  | Circuit schematics: each LED is connected to Wiring pins 0 to 9. The ranger sensor is connected to Wiring analog input pin 0.