motor PWM test

void setup() {
  pinMode(9,OUTPUT);
  pinMode(10,OUTPUT);
  digitalWrite(9,HIGH);
  analogWrite(10,0);
}

int val=0;
int i=1;

void loop() {
  delay(10);
  analogWrite(10,val);
  val+=i;
  if(val>254) i=-1;
  if(val<1) i=1;
}