#define LED_RED 13
#define LED_GREEN 12
#define LED_BLUE 11
#define BUZZER_PIN 4


void setup() {

  pinMode(LED_RED, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(LED_BLUE, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

}

void loop() {

  analogWrite(LED_RED, random(256));
  analogWrite(LED_GREEN, random(256));
  analogWrite(LED_BLUE, random(256));
  
  tone(BUZZER_PIN, random(900));

  delay(500);

}