int pot = 33;
int leitura = 0;
int rel_pin = 14;
void setup() { 
  Serial.begin(115200);
  pinMode(rel_pin, OUTPUT);
}

void loop() {
  leitura = analogRead(pot);
  char msg[30];
  sprintf(msg, "Leitura do pot: %d", leitura);
  Serial.println(msg);
  if(leitura > 2000) digitalWrite(rel_pin, HIGH);
  else digitalWrite(rel_pin, LOW);
  delay(30);
}