int led_1 = 3;
  int led_2 = 5;
  int potenciometro = A5;
  int leitura = 0;

void setup() 
{
pinMode(led_1, OUTPUT);
pinMode(led_2, OUTPUT);
digitalWrite(led_1, LOW);
digitalWrite(led_2, LOW); 
}

void loop() 
{
leitura=analogRead(potenciometro);  
if (leitura<= 512)
 {
 digitalWrite(led_1, HIGH);
 digitalWrite(led_2, LOW);
 }
else
 {
 digitalWrite(led_1, LOW);
 digitalWrite(led_2, HIGH);
 }
}