int buttonState=0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
   pinMode(22, OUTPUT);
   pinMode(17, OUTPUT);
   pinMode(4, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(22, HIGH);
  delay(3000); 
  digitalWrite(22, LOW);
  digitalWrite(17, HIGH);
   delay(1000); // 
  digitalWrite(17, LOW);
  digitalWrite(4, HIGH);
  delay(2000); 
  digitalWrite(4, LOW);
}