int b1 = 2;
int b2 = 4;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(b1, INPUT);
  pinMode(b2, INPUT);
}

void loop() {
  int b1State = digitalRead(b1);
  int b2State = digitalRead(b2);

  if(b1State == LOW){
    Serial.println("button 1 is pressed");
    delay(200);
  }

  if(b2State == HIGH){
    Serial.println("button 2 is pressed");
    delay(200);
  }
}