test relay with uart ESP32S3 6ch

#include <Arduino.h>
// #include "pitches.h"

// Deklarasi pin relay
const int relay1 = 1;
const int relay2 = 2;
const int relay3 = 41;
const int relay4 = 42;
const int relay5 = 45;
const int relay6 = 46;
const int buzzer = 21;

#define NOTE_A4 440
#define NOTE_B4 494
#define NOTE_C3 131

int notes[] = {
  NOTE_A4, NOTE_B4, NOTE_C3
};

void setup() {
  // Inisialisasi pin relay sebagai output
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(relay4, OUTPUT);
  pinMode(relay5, OUTPUT);
  pinMode(relay6, OUTPUT);
  pinMode(buzzer, OUTPUT);

  // Inisialisasi komunikasi serial
  Serial.begin(9600);
}

void loop() {
  // Cek jika ada data yang diterima melalui serial port
  if (Serial.available() > 0) {
    char command = Serial.read();

    switch (command) {
      case '1':
        digitalWrite(relay1, !digitalRead(relay1));
        break;
      case '2':
        digitalWrite(relay2, !digitalRead(relay2));
        break;
      case '3':
        digitalWrite(relay3, !digitalRead(relay3));
        break;
      case '4':
        digitalWrite(relay4, !digitalRead(relay4));
        break;
      case '5':
        digitalWrite(relay5, !digitalRead(relay5));
        break;
      case '6':
        digitalWrite(relay6, !digitalRead(relay6));
        break;
      case 'b':
        tone(buzzer, notes[0], 20);
        tone(buzzer, notes[1], 20);
        tone(buzzer, notes[2], 20);
        break;
    }
  }
}