int spark= 9;
int fuel = 12;
int led = 13;
int on = 5;
int onst;
int onst1 = 0;
void setup() {
pinMode(on, INPUT);
pinMode(fuel, OUTPUT);
pinMode(led, OUTPUT);
pinMode(spark, OUTPUT);
digitalWrite(spark, LOW);
digitalWrite(fuel, LOW);

}

void loop() {
 onst = digitalRead(on);
 if(onst == HIGH){
   digitalWrite(A1, HIGH);
  onst1 = 1;
  delay(50); 
  }
  int onst2 = digitalRead(on);
 if(onst2 == LOW && onst1 == 1){
   delay(200);
     digitalWrite(spark,HIGH);
    delay(10);
    digitalWrite(led,HIGH);
     digitalWrite(fuel,HIGH);
     delay(5000);
     digitalWrite(fuel,LOW);
     delay(20);
     digitalWrite(spark,LOW);
     digitalWrite(led,LOW);
     delay(10);
     digitalWrite(A1,LOW);

     onst1 = 0;   
 }
 else{
   onst1 = 0;
 }
 
}