automatic rain shelter college project (ELECTRICAL AND ELECTRONICS)

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Arduino code

int val = 0 ;
int chk_value = 0;
int previous_value = 0;
bool run_if = true;
void setup()
{
Serial.begin(9600);
pinMode(4,INPUT); // rain sensor output pin connected
pinMode(6,OUTPUT); // motor
pinMode(7,OUTPUT); // motor
pinMode(3,OUTPUT); // LED
pinMode(5,OUTPUT); // BUZZER
}
void loop()
{
val = digitalRead(4); // rain sensor output pin connected
Serial.println(val); // see the value in serial mpnitor in Arduino IDE
delay(4);

if(previous_value!=val && chk_value==1){
run_if = true;
}

if(val == 1 && run_if==true)
{
digitalWrite(7,HIGH);
digitalWrite(6,LOW);

delay(19000);

digitalWrite(7,LOW);
digitalWrite(6,LOW);

chk_value = 1;
run_if=false;
}
else if(val==0 && run_if==true)
{
digitalWrite(7,LOW);
digitalWrite(6,HIGH);
digitalWrite(3,HIGH);
digitalWrite(5,HIGH);

delay(19000);

digitalWrite(3,LOW);
digitalWrite(5,LOW);

chk_value = 1;
run_if=false;
}

previous_value=val;
}