Basic for loop

/* Baisc for loop for students to practice with
* Optimized for Lilymini
* written by B. Elliot Oct 15, 2019
*/

// Dim an LED using a PWM pin
int PWMpin = 3;  // LED in series with 470 ohm resistor on pin 10

void setup() {
  // no setup needed
}

void loop() {
  for (int i = 0; i <= 255; i++) {
    analogWrite(PWMpin, i);
    delay(20);
  }
}