const int Led1 = 5;
const int Led2 = 6;
float mesure;
void setup() {
  pinMode(Led1, OUTPUT);
  pinMode(Led2, OUTPUT);
}

void loop() {
    mesure = analogRead(A0);
     digitalWrite (Led1, LOW);
     digitalWrite (Led2, LOW);
     if (mesure < 512){
      digitalWrite (Led1, HIGH);
      digitalWrite (Led2, LOW);
     }
     else{
      digitalWrite (Led1, LOW);
      digitalWrite (Led2, HIGH);
     }
}