#define MINUS 4
#define PLUS 8
int counter = 0;

void setup() {
  pinMode(MINUS, INPUT);
  pinMode(PLUS, INPUT);
  Serial.begin(9600);

}

void loop() {
  if(digitalRead(PLUS)== 1){
    counter ++;
    Serial.print("sayaç = ");
    Serial.println(counter);
    while(digitalRead(PLUS)== 1){
      delay(100);
    }
  }

}