#include <SoftwareSerial.h>


int a=0;
int data;
String wiadomosc = "";
int iw=0;
void setup(){
  pinMode(4, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, INPUT);
  digitalWrite(4, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
  Serial3.begin(9600);
  Serial.begin(9600);
}

void loop(){


  int test=0;
  int p;
  int l;
  int k;
  if(Serial3.find("s")) {
    test = Serial3.parseInt();
    k = Serial3.parseInt();
    if(k == 0) digitalWrite(6, HIGH);
    if(k == 1) digitalWrite(6, LOW);
    digitalWrite(7, LOW);
    for(int x=0; x<test; x++)
    {
    if(digitalRead(8) == HIGH) {
      x = test;
    digitalWrite(6, HIGH);
    do
    {
      digitalWrite(4, HIGH);
      delayMicroseconds(500);
      digitalWrite(4, LOW);
      delayMicroseconds(500);
    }
    while(digitalRead(8) == HIGH);
    }
    if(x != test)
        {
        digitalWrite(4, HIGH);
        delayMicroseconds(500);
        digitalWrite(4, LOW);
        delayMicroseconds(500);
        }
    }
    digitalWrite(7, HIGH);
    Serial3.println(test);
    Serial.println(test);
    test=0;
     }

  }