Arduino kod hata nerede var?

İnt sensor = a2;
İnt olcum;

Unsigned long gun = 86400000;
İnt veri;

Void setup() {
 Pinmode(8, output);
 Pinmode(9, output);
Pinmode(7, output);
Pinmode(13, output);
 Serial. Begin(9600);
}

Void loop() {
 Serial. Println(gun);
 Digitalwrite(13, hıgh);
 Olcum = analogread(sensor);
 Serial. Println("kalan su = ");
 Serial. Println(olcum);
 Delay(50);
 İf(olcum<50){
 Digitalwrite(7, hıgh);
 }
 Else{
 Digitalwrite(7, Low);
 Delay(gun);
 Digitalwrite(9, hıgh);
 Digitalwrite(8, Low);
 Delay(500);
 Digitalwrite(9, Low);
 Digitalwrite(8, Low);
 }
}