int ledPin = 13;

void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  digitalWrite(ledPin, HIGH); 
  delay(250); 
  digitalWrite(ledPin, LOW); 
  delay(750); 
}


--


const int ledPin = 13;
const int buttonPin = 2;
int buttonState = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  
  if (buttonState == LOW) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }
}


--


int ledPin = 11;
int brightness = 0;
int fadeAmount = 5; 

void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  analogWrite(ledPin, brightness);
  brightness = brightness + fadeAmount;
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  delay(30);
}


-


const int analogLedPin = 11;
const int potPin = A0;
int brightnessLevel = 0;
int outputBrightness = 0;

void setup() {

}

void loop() {
  brightnessLevel = analogRead(potPin);
  outputBrightness = map(brightnessLevel, 0, 1023, 0, 255);

  analogWrite(analogLedPin, outputBrightness);

  delay(2);
}