Build Instructions

Collapse

• 1

  programming

  float RGB[3];
  int ldrPin = 4;     // LDR in Analog Input 0 to read the ambient light
  int ambientLight;   // variable to store the value of the ambient light
  int redLed   = 9;  // red LED in Digital Pin 11 (PWM)
  int greenLed = 5;  // green LED in Digital Pin 10 (PWM)
  int blueLed  = 7;   // blue LED in Digital Pin 9 (PWM)
  
  void setup(){
    pinMode(redLed,OUTPUT);  // tell arduino it's an output
    pinMode(greenLed,OUTPUT);// tell arduino it's an output
    pinMode(blueLed,OUTPUT); // tell arduino it's an output
  
    // set all the outputs to low
    digitalWrite(redLed,LOW);
    digitalWrite(greenLed,LOW);
    digitalWrite(blueLed,LOW);
  }
  
  void loop(){
    for (float x=0;x<PI;x=x+0.00001){
      RGB[0]=255*abs(sin(x*(180/PI)));           // calculate the brightness for the red led
      RGB[1]=255*abs(sin((x+PI/3)*(180/PI)));    // calculate the brightness for the green led
      RGB[2]=255*abs(sin((x+(2*PI)/3)*(180/PI)));// calculate the brightness for the blue led
      ambientLight=analogRead(ldrPin); // read an store the ambient light
      if(ambientLight<600){ // start only if the ambient light is very low
        //  write the brightness on the leds
        analogWrite(redLed,RGB[0]);
        analogWrite(greenLed,RGB[1]);
        analogWrite(blueLed,RGB[2]);
      }
      else{
        digitalWrite(redLed,LOW);
        digitalWrite(greenLed,LOW);
        digitalWrite(blueLed,LOW);
      }
      for(int i=0;i<3;i++){
        if(RGB[i]<1){
          delay(100);
        }
        if(RGB[i]<5){
          delay(50);
        }
        if(RGB[i]<10){
          delay(10);
        }
        if(RGB[i]<100){
          delay(5);
        }
      }
      delay(1);
    }
  }
  

View all instructions