A Tracking Platform for Astrophotography

Stepper motor 28BYJ-48 driven by arduino.
The attachment to the tripod has not yet been thought through. Gears 5: 1.

int in1 = 2;
int in2 = 3;
int in3 = 4;
int in4 = 5;
const int dl = 3;
void setup() {
pinMode(in1, OUTPUT);
pinMode(in2, OUTPUT);
pinMode(in3, OUTPUT);
pinMode(in4, OUTPUT);
}
void loop() {
digitalWrite( in1, LOW );
digitalWrite( in2, LOW );
digitalWrite( in3, LOW );
digitalWrite( in4, HIGH );
delay(dl);

digitalWrite( in1, HIGH );
digitalWrite( in2, LOW );
digitalWrite( in3, LOW );
digitalWrite( in4, HIGH );
delay(dl);

digitalWrite( in1, HIGH );
digitalWrite( in2, LOW );
digitalWrite( in3, LOW );
digitalWrite( in4, HIGH );
delay(dl);

digitalWrite( in1, HIGH );
digitalWrite( in2, HIGH );
digitalWrite( in3, LOW );
digitalWrite( in4, LOW );
delay(dl);

digitalWrite( in1, LOW );
digitalWrite( in2, HIGH );
digitalWrite( in3, LOW );
digitalWrite( in4, LOW );
delay(dl);

digitalWrite( in1, LOW );
digitalWrite( in2, HIGH );
digit