Arduino for kids - mood light

/*
 * Arduino for kids - Mood Light
 *
 * learnelectronics
 * 4 JUL 2017
 *
 * www.youtube.com/c/learnelectronics
 * [email protected]
 *
 * Common Cathode RGB LED
 *
 *            [   ]
 *            [   ]
 *            -----
 *            ||||
 *            RGGB
 *            ERRL
 *            DOEU
 *             UEE
 *             N
 *             D
 *
 */


#define led0    9                                 //RED LED on PWM pin 9
#define led1    10                                //GREEN LED on PWM pin 9
#define led2    12                                //BLUE LED on PWM pin 9

int brightness = 200;                             //Set brightnes refererence
int red = 0;                                      //Set RED to 0
int blue = 0;                                     //Set Blue to 0
int green = 0;                                    //Set Green to 0


void setup() {

  pinMode(led0,OUTPUT);                           //sets pin 9 to output
  pinMode(led1,OUTPUT);                           //sets pin 10 to output
  pinMode(led2,OUTPUT);                           //sets pin 11 to output

}

void loop() {

  for (float x= 0;x <PI; x = x + 0.000004){
    red = brightness * abs(sin(x*(180/PI)));            //do some trig to calculate a value for red
    green = brightness * abs(sin((x+PI/3)*(180/PI)));   //do some trig to calculate a value for green
    blue = brightness * abs(sin((x+2*PI)/3)*(180/PI));  //do some trig to calculate a value for blue

    analogWrite(led0, red);                       //send the value for red to red LED
    analogWrite(led1, green);                     //send the value for green to green LED
    analogWrite(led2, blue);                      //send the value for blue to blue LED

  }                                               //end of for loop

}