SOLAR TRACKER AND AUTO CURTAINS

int m1 = 12;
int m2 = 10;
int ldr = A1;
int isDay = false;
int light;
void setup()
{
  pinMode(m1, OUTPUT);
  pinMode(m2, OUTPUT);
  pinMode(ldr, INPUT);
  Serial.begin(9600);
}
void loop()
{
  light = analogRead(ldr);
  Serial.println(light);
  if ((light >= 900) && (isDay == false)) //light value more than 800
  {
    Serial.println("its day ");
    digitalWrite(m1, HIGH);
    digitalWrite(m2, LOW);
    delay(12000);
    digitalWrite(m1, LOW);
    digitalWrite(m2, LOW);
    isDay = true;
  }

  if ((light < 300) && ( isDay == true)) //light value less than 200
  {
    digitalWrite(m1, LOW);
    digitalWrite(m2, HIGH);
    delay(12000);
    digitalWrite(m1, LOW);
    digitalWrite(m2, LOW);
    isDay = false;
    Serial.println("its night");
  }
}