Obstacle Avoidance Stepper

1void setup() {
2   Serial.begin(9600);
3  pinMode(3, INPUT); //IR  Sensor
4  pinMode(8, OUTPUT); // Stepper Direction
5  pinMode(9, OUTPUT); //  Stepper Step
6  digitalWrite(8, LOW);
7  digitalWrite(9, LOW);
8}
9
10void  loop() {
11int detect = digitalRead (3);
12if (detect != HIGH){
13    digitalWrite(9,  HIGH);
14  delayMicroseconds(500);          
15  digitalWrite(9, LOW); 
16  delayMicroseconds(500);  
17}
18else{
19  if(detect == LOW)
20  digitalWrite(9, LOW);
21  delayMicroseconds(500);          
22  digitalWrite(9, HIGH); 
23  delayMicroseconds(500); 
24}
25}