// Demo program SKU:HD04A by hwthinker@gmail.com
// cara upload program
// 1. pastikan jumper IO0 ke Ground
// 2. klik tombol reset
// 3. lepas jumper 
// 4. upload program
// 5. pastikan tombol reset diklik lagi agar program running, kalau tidak direset tidak akan menjalankan program karena masih di mode download

// koneksi pin
// Modul relay   serial USB
// TX            RX
// RX            TX
// GND           GND

// definisi PinOUT
#define RLY1 5
#define RLY2 4
#define RLY3 0
#define RLY4 15
#define RLY5 13
#define RLY6 12
#define RLY7 14
#define RLY8 16

const byte numPins = 8;
byte pinList[8] = {RLY1, RLY2, RLY3, RLY4, RLY5, RLY6, RLY7, RLY8};

// #define GPIO2 2  //internal LED

// Fungsi untuk membaca perintah dari serial port
void readCommand() {
  // Baca satu karakter dari serial port
  char c = Serial.read();

  if (c == '1') {
    // Set GPIO output ke HIGH
    digitalWrite(RLY1, !digitalRead(RLY1));
  }

  if (c == '2') {
    // Set GPIO output ke HIGH
    digitalWrite(RLY2, !digitalRead(RLY2));
  }

  if (c == '3') {
    // Set GPIO output ke HIGH
    digitalWrite(RLY3, !digitalRead(RLY3));
  }

  if (c == '4') {
    // Set GPIO output ke HIGH
    digitalWrite(RLY4, !digitalRead(RLY4));
  }
  if (c == '5') {
    // Set GPIO output ke HIGH
    digitalWrite(RLY5, !digitalRead(RLY5));
  }
  if (c == '6') {
    // Set GPIO output ke HIGH
    digitalWrite(RLY6, !digitalRead(RLY6));
  }
  if (c == '7') {
    // Set GPIO output ke HIGH
    digitalWrite(RLY7, !digitalRead(RLY7));
  }
  if (c == '8') {
    // Set GPIO output ke HIGH
    digitalWrite(RLY8, !digitalRead(RLY8));
  }
}
// Fungsi setup
void setup() {
  // Inisialisasi serial port
  Serial.begin(9600);

   for(int i=0; i<numPins; i++) {
    pinMode(pinList[i], OUTPUT);
    digitalWrite(pinList[i], LOW); 
  }
}

// Fungsi loop
void loop() {
  // Baca perintah dari serial port
  readCommand();
}