int Relay_in1 = 7;
int LED1 = 8;
int sw1 = 9;

int Relay_in2 = 5;
int LED2 = 10;
int sw2 = 11;

int Relay_in3 = 6;
int LED3 = 2;
int sw3 = 3;

int Relay_in4 = 12;
int LED4 = 13;
int sw4 = 4;

void setup() {
  Serial.begin(9600);
  pinMode(Relay_in1, OUTPUT);
  pinMode(LED1, OUTPUT);
  pinMode(sw1, INPUT_PULLUP);
  
  pinMode(Relay_in2, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(sw2, INPUT_PULLUP);
  
  pinMode(Relay_in3, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(sw3, INPUT_PULLUP);

  pinMode(Relay_in4, OUTPUT);
  pinMode(LED4, OUTPUT);
  pinMode(sw4, INPUT_PULLUP);
  Serial.println("Press Sw FOR ON");
}

void loop() {
  int khem_sw1 = digitalRead(sw1);
  if (khem_sw1 == LOW) {
    Serial.println("LED1 ON");
    digitalWrite(Relay_in1, HIGH);// ถ้า sw1 ถูกกด
  } else {
    digitalWrite(Relay_in1, LOW);
  }
 delay(10);

  int khem_sw2 = digitalRead(sw2);
  if (khem_sw2 == LOW) {
    Serial.println("LED2 ON");
    digitalWrite(Relay_in2, HIGH);// ถ้า sw2 ถูกกด
  } else {
    digitalWrite(Relay_in2, LOW);
  }
 delay(10);
 
  int khem_sw3 = digitalRead(sw3);
  if (khem_sw3 == LOW) {
    Serial.println("LED3 ON");
    digitalWrite(Relay_in3, HIGH);// ถ้า sw3 ถูกกด
  } else {
    digitalWrite(Relay_in3, LOW);
  }
 delay(10);

  int khem_sw4 = digitalRead(sw4);
  if (khem_sw4 == LOW) {
    Serial.println("LED4 ON");
    digitalWrite(Relay_in4, HIGH);// ถ้า sw4 ถูกกด
  } else {
    digitalWrite(Relay_in4, LOW);
  }
  delay(10);
}