//20240606 prj7 variable 
//program do display 4 leds use for command, array structure
 
int pin[] = {15, 4, 5, 18}; // array of pins leg led

void setup() {
  //Serial.begin(115200);
  // pin 2 , pin 0 use for program
  // pin 16 use for RX , ping 17 use for TX
  // pin for ESP32
  // loop initial pin 15 4 5 18 to OUTPUT

  for (int i=0; i<=3; i++) {
    pinMode(pin[i], OUTPUT); 
  }
  
}
//
void loop() {
  
  for (byte i=0; i<=3; i++) {
    digitalWrite(pin[i], HIGH);
    delay(1000);
    digitalWrite(pin[i], LOW);
    delay(1000);
  }
 
}
//  end of program