#include <Arduino.h>

#define LED 4   // Sinal digital
#define POT 34  // Sinal analógico

int valorPOT;
int perc;

void setup() {
  Serial.begin(115200);  
  pinMode(LED, OUTPUT);

  digitalWrite(LED, HIGH);
  delay(2000);
  digitalWrite(LED, LOW);

  Serial.println("Fim da inicialização"); 
}

void loop() {
  valorPOT = analogRead(POT); // 12 bits ----> 0 a 4.095;
  delay(10); // 0.01s
  perc = map(valorPOT, 0, 4095, 0, 100); // 0 a 100%

  Serial.print("VALOR DO ADC: " + String(valorPOT));
  Serial.println(" - Percentual: " + String(perc));

  delay(1500); // 1.5s

  if(perc > 80) digitalWrite(LED, HIGH); // HIGH ---> 3.3V
  else digitalWrite(LED, LOW);
}