int led_3=3; //led dioda mora biti spojena na PWM
int tipkalo_4=4;
int tipkalo_5=5;
int tipkalo_6=6;
int brojac=0;
void setup() {
  // put your setup code here, to run once:
pinMode(led_3, OUTPUT);
pinMode(tipkalo_4, INPUT_PULLUP);
pinMode(tipkalo_5, INPUT_PULLUP);
pinMode(tipkalo_6, INPUT_PULLUP);
digitalWrite(led_3, LOW);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
 if(digitalRead(tipkalo_4)==LOW)
{
 Serial.println("pritisnuto tipkalo");
 delay(500);
}
else
{
  Serial.println("pušteno tipkalo");
  delay(500);
}
}