//INPUT:potentiometrer should be connected to 5v and GWD
int potpin = A0;
int potval = 0;
 
//OUTPUT :use digital pin 9-11, The pulse width Modulation (PWM)pins
//LED's cathods should be connected to digital GND
 int redpin = 6;
 int grnpin = 7;
 int blupin = 8;

 //program variables
 int redval = 0;
 int grnval = 0;
 int bluval = 0;
 

void setup() {
  // put your setup code here, to run once:
pinMode(redpin, OUTPUT);
pinMode(grnpin, OUTPUT);
pinMode(blupin, OUTPUT);

}

void loop() {
  potval = analogRead(potpin);

if(potval < 341)//
{
  potval = (potval * 3)/4;
  redval = 256 - potval;
  grnval = potval;
  bluval = 1;
}
else if (potval < 682)
{
potval = ((potval-341)*3)/4;
redval = 1;
grnval = 256-potval;
bluval = potval;

}
else
{
  potval = ((potval-683)*3)/4;
  redval = potval;
  grnval = 1;
  bluval = 256 - potval;

}
analogWrite(redpin, redval);
analogWrite(grnpin, grnval);
analogWrite(blupin, bluval);
}