int redpin = 11;    // select the input pin for the potentiometer

int bluepin =10;      // select the pin for the LED

int val;

 

void setup() {

  pinMode(redpin, OUTPUT);

  pinMode(bluepin, OUTPUT);

  Serial.begin(9600);

}

 

void loop() 

{

for(val=255; val>0; val--)

  {

   analogWrite(11, val);

   analogWrite(10, 255-val);

   delay(15); 

  }

for(val=0; val<255; val++)

  {

   analogWrite(11, val);

   analogWrite(10, 255-val);

   delay(15); 

  }

 Serial.println(val, DEC);

}