void setup() {
 Serial.begin(9600);  
}

int rozdiel;

void loop() {
 
 int randomValue = random(0, 101);
 
 unsigned long currentTime = millis();
 
 Serial.print("Random Value: ");
 Serial.print(randomValue);
 Serial.print(" | Time: ");
 Serial.print(currentTime);
 Serial.print(" | Rozdiel: ");
 Serial.println(rozdiel);
 
 delay(random(500, 2001));

 rozdiel = millis() - currentTime;
}