int bright = 0;
void setup() {
  // put your setup code here, to run once:
pinMode(10, OUTPUT);
pinMode(6, OUTPUT);
}
void loop() {
  // put your main code here, to run repeatedly:
 analogWrite(10, bright);
 analogWrite(6, bright);
 bright += 5;
 if((bright==0) || (bright==255)){
  bright = -bright;
 }
 delay(50);
  }