void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(29, OUTPUT);
  Serial.println("一森我来了！");
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available()) {
    String ruxin = Serial.readStringUntil('\n');
    if (ruxin == "tianxue") {
      digitalWrite(29, HIGH);
      delay(500);
      digitalWrite(29, LOW);
    } else {
      digitalWrite(29, HIGH);
      delay(200);
      digitalWrite(29, LOW);
      delay(200);
      digitalWrite(29, HIGH);
      delay(200);
      digitalWrite(29, LOW);
      delay(200);
      digitalWrite(29, HIGH);
      delay(200);
      digitalWrite(29, LOW);
      delay(200);
    }
  }
  
  
}