// Parameterizing pin numbers for better readability and maintainability
int led1 = D0;
int led2 = D6;
int led3 = D7;
int potenciometer = A2;

int brightness; // variable for brightness

void setup() {
  // Set the pinMode for LEDs and potentiometer
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(potenciometer, INPUT);
}

void loop() {
  // Read the analog value from the potentiometer and scale it to a range of 0-255
  brightness = analogRead(potenciometer) / 4; 
  // By dividing this value by 4, you are scaling the range to 0-255 compatible with analogWrite()
  
  // Set the brightness of the LEDs based on the scaled potentiometer value
  analogWrite(led1, brightness);
  analogWrite(led2, brightness);
  analogWrite(led3, brightness);
}
}