int InputTXT_Int() {
  int val;
  while (Serial.available() == 0) ;  // Wait here until input buffer has a character
  {
    val = Serial.parseInt();        //  returns the first valid integer point number from the Serial buffer

    while (Serial.available() > 0)
    {
      Serial.read() ;  // clear the keyboard buffer
    }
  }
  return val;
}

float InputTXT_Float() {
  float val;
  while (Serial.available() == 0) ;  // Wait here until input buffer has a character
  {
    val = Serial.parseFloat();       //  returns the first valid floating point number from the Serial buffer

    while (Serial.available() > 0)  // .parseFloat() can leave non-numeric characters
    {
      Serial.read() ;  // clear the keyboard buffer
    }
  }
  return val;
}

///////////////////////////////////////////////////////////////////////////////////

int motorPin = 9 ;
void setup() {
  Serial.begin(9600) ;
  pinMode(motorPin, OUTPUT) ;
  } // void setup()
void loop() {
  Serial.print("Speed Motor (1-255)= ") ;
  float a = InputTXT_Float() ;
  Serial.println(a) ;
  Serial.print("Time Motor On (sec) = ") ;
  float b = InputTXT_Float() * 1000 ; 
  Serial.println(b/1000) ;
  motorOnThenOffWithSpeed(a, b) ;
} // void loop()
/////////////////////////////////////////////////////////////////////////////////////
void motorOnThenOffWithSpeed(float s, float y) { // เปิด-ปิด มอเตอร์ให้ทำงานแบบใช้ analogWrite()
  float onSpeed = s ; // a number between 0 (stopped) and full speed)
  float onTime = y ; // the number of milliseconds for the motor to turn on
  float offSpeed = 0 ; // a number between 0 (stopped) and 225 (full speed)
  // float offTime = 1000 ; // the number of milliseconds for the motor to turn off for
  analogWrite(motorPin, onSpeed); // turns the motor On
  delay(onTime) ; // waits for onTime milliseconds
  analogWrite(motorPin, offSpeed); // turns the motor Off
  // delay(offTime) ; // waits for offTime milliseconds
} // void motorOnThenOffWithSpeed()