//pwmExample from addOhms

const byte led = 13;
const byte pwm = 3;


void setup() {
  // put your setup code here, to run once: initialize uno pins.

  pinMode(led, OUTPUT);
  pinMode(pwm, OUTPUT);
  analogWrite(pwm, 128);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(led, HIGH);
  delay(100);
  digitalWrite(led, LOW);
  delay(100);
}