#define RED 12
#define YELLOW 13
#define GREEN 14

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(RED, OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(GREEN, OUTPUT);
}

void loop() {
 digitalWrite(RED, HIGH);
 digitalWrite(GREEN,LOW);
 delay(1000);
 digitalWrite(RED, LOW);
 digitalWrite(YELLOW, HIGH);
 delay(1000);
 digitalWrite(RED, LOW);
 digitalWrite(YELLOW, LOW);
 digitalWrite(GREEN, HIGH);\
 delay(1000);
 
}