int count = 0;
int curr_State;
int prev_State = LOW;
#define L1 7
#define L2 8
#define interruptPin 2
void setup() {
  // put your setup code here, to run once:
  pinMode(L1, OUTPUT);
  pinMode(L2, OUTPUT);
  pinMode(interruptPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  count = checkCount(count);
  if (count == 1){
    digitalWrite(L1, HIGH);
  }
  if (count == 2){
    digitalWrite(L2, HIGH);
  }
  if (count == 3){
    digitalWrite(L1,LOW);
  }
  if (count == 4){
    digitalWrite(L2, LOW);
    count = 0;
  }
  Serial.print(digitalRead(interruptPin));
  Serial.print(" ");
  Serial.println(count);
}

int checkCount(int count){
  curr_State = digitalRead(interruptPin);
  if ((curr_State != prev_State) && (curr_State == HIGH)){
    count++;
  }
  prev_State = curr_State;
  return count;
}