const int analogInPin = 2;  // Analog input pin that the potentiometer is attached to
const int analogOutPin = 25;  // Analog output pin that the LED is attached to
int ref = 0, limite = 500;

int sensorValue = 0;  // value read from the pot
int outputValue = 0;  // value output to the PWM (analog out)

void setup() {
    Serial.begin(9600); //inicializa a comunicação do Monitor Serial
    pinMode(analogInPin, INPUT);
    pinMode(analogOutPin, INPUT);
}

void loop() {

   if(millis() - ref >= limite){
      ref = millis();
      sensorValue = analogRead(analogInPin); //lê o pino de forma analógica
      outputValue = map(sensorValue, 0, 4095, 0, 255); //faz regra de três entre duas faixas de valores
      analogWrite(analogOutPin, outputValue); //joga o resultado da regra de 3 no pino do LED
      Serial.print("sensor = ");
      Serial.print(sensorValue);
      Serial.print("\t output = ");
      Serial.println(outputValue);
   }
}