#define red 10
#define blue 7
#define green 9
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600); 
pinMode(red,OUTPUT);
pinMode(blue, OUTPUT); 
pinMode(green, OUTPUT); 
}

void loop() {
  // put your main code here, to run repeatedly:
    
          int data=Serial.read(); 
          switch (data){
          case '0':
               setColor(0, 255, 255); // Red Color
                break;      

           case '1':
               setColor(255, 255, 0); // Blue Color
                break;
                 
          case '2':
               setColor(255, 0, 255); // Green Color
                break;
        
           case '3':
           setColor(0, 0, 0); // White Color
                break;   
                
                  
}
 
}
void setColor(int redValue, int greenValue, int blueValue) {
  analogWrite(red, redValue);
  analogWrite(green, greenValue);
  analogWrite(blue, blueValue);
}