int deger;
void setup() {
pinMode(13,OUTPUT);
pinMode(12,OUTPUT);
pinMode(A0,INPUT);
} 
void loop() {
deger=analogRead(A0);
if(deger<512)
{
  digitalWrite(13,HIGH);
    digitalWrite(12,LOW);
}
else
{
    digitalWrite(13,LOW);
    digitalWrite(12,HIGH);
}
}