#include <Adafruit_NeoPixel.h>
Adafruit_NeoPixel neo(10,9, NEO_RGB + NEO_KHZ800);

int cislo = -1;
bool x = false;

void setup() {
neo.begin();
pinMode(2, INPUT);
digitalWrite(2, HIGH);
attachInterrupt(digitalPinToInterrupt(2) , p1, FALLING);
}

void p1()
{
cislo++;
x = true;
if(cislo == 10)
{ 
  cislo = 0;
  neo.clear();
}
}

void loop() {

 if(x == true)
{
  neo.clear();
neo.setPixelColor(cislo,255, 0, 255);
neo.show();
  x = false;

}

}