void setup() {
  pinMode(A5, INPUT);
  digitalWrite(A5, HIGH);

  Serial.begin(9600);
}

int i = 0;
int test = 0;



void loop() {
  if (digitalRead(A5) == LOW && test == 0) //  if (digitalRead(A5) == LOW && test == true)
  {
    test = 1; //test = false
    i++;
    Serial.println(i);
  }
  if (digitalRead(A5) == HIGH && test == 1) //  if (digitalRead(A5) == LOW && test == false)
  {
    test = 0; //test = true
    
  }

 
}