int irSensorVal = 0;
unsigned long tStart = 0;
unsigned long tElapsed = 0;
bool isCoin = false;

void setup() {
  Serial.begin(9600);
  pinMode(7,OUTPUT);
  pinMode(A0,INPUT);


}

void loop() {
  irSensorVal = analogRead(A0);
  digitalWrite(7,LOW);
  Serial.println(irSensorVal);
  while(irSensorVal < 50){
    Serial.println(irSensorVal);
    digitalWrite(7,HIGH);
    if(tStart <= 0){
      //Serial.println(millis());
       tStart = millis();
    }
  isCoin = true;
  irSensorVal = analogRead(A0);
  }
  tElapsed = millis()- tStart;
  if(tElapsed > 2 && isCoin){
        //Serial.println(tElapsed);
        tStart = 0;
        tElapsed = 0;
        isCoin = false;
        //Serial.println("ok");
  }
}