Simple servo code to control a gong

servo.ino

#include <Servo.h> 
 
Servo myservo;   

String inputString = "";         // a string to hold incoming data
boolean stringComplete = false;  // whether the string is complete
 
void setup() 
{ 
  
  myservo.attach(2);  // attaches the servo on pin 2 to the servo object 
  myservo.write(90);
  Serial.begin(9600);
  // reserve 200 bytes for the inputString:
  inputString.reserve(200);
} 
 
 
void loop() 
{ 
  if (stringComplete && inputString == "gong\n") { 
    Serial.println(inputString);
    myservo.write(140);
    delay(100);
    myservo.write(40);
    delay(5000);
    myservo.write(90);
    
    // clear the string ready for another go
    inputString = "";
    stringComplete = false;
  }
}

void serialEvent() {
  while (Serial.available()) {
    // get the new byte:
    char inChar = (char)Serial.read();
    // add it to the inputString:
    inputString += inChar;
    // if the incoming character is a newline, set a flag
    // so the main loop can do something about it:
    if (inChar == '\n') {
      stringComplete = true;
    }
  }
}