int btn = 2;
int btnState;
long randNumber;
void setup() {
  // put your setup code here, to run once:
  pinMode(btn, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
byte btnState = digitalRead(btn);
  randNumber = random(1, 7);

 if (btnState == LOW) {
      Serial.println(randNumber);
  }
  else {
  }
  delay(100);
}