int ledPin1 = 3, ledPin2 = 5, ledPin3 = 6;
int ledPin4 = 9, ledPin5 = 10, ledPin6 = 11;

int pwmVal1 = 0, pwmVal2 = 0, pwmVal3 = 0;
int pwmVal4 = 0, pwmVal5 = 0, pwmVal6 = 0;

void setup(){
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  pinMode(ledPin4, OUTPUT);
  pinMode(ledPin5, OUTPUT);
  pinMode(ledPin6, OUTPUT);
}

void loop(){
  pwmVal1 = int( random(255) );
  pwmVal2 = int( random(255) );
  pwmVal3 = int( random(255) );
  pwmVal4 = int( random(255) );
  pwmVal5 = int( random(255) );
  pwmVal6 = int( random(255) );

  analogWrite(ledPin1, pwmVal1);
  analogWrite(ledPin2, pwmVal2);
  analogWrite(ledPin3, pwmVal3);
  analogWrite(ledPin4, pwmVal4);
  analogWrite(ledPin5, pwmVal5);
  analogWrite(ledPin6, pwmVal6);
  
  delay(10);
}