#include <Toggle.h>

const byte buttonPin = 2;
const byte ledPin = 11;
byte brightness;
bool fadeUp;

Toggle button(buttonPin);

void setup() {
  button.begin(buttonPin);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  button.poll();
  if (button.onPress()) fadeUp = !fadeUp;
  if (button.isPressed()) {
    (fadeUp) ? brightness++ : brightness--;
    if (brightness == 255) brightness = 0;
    else if (brightness >= 253) brightness = 253;
    delay(10);
  }
  analogWrite(ledPin, brightness);
}