#define OnBoardLED 13
#define POT_01 A0

void setup() {
  pinMode(OnBoardLED, OUTPUT);
  Serial.begin(9600);
  Serial.println("็Hello ENE of RMUTI Khonkaen");
}

void POT_read(void)
{
  unsigned int ADC_Val = analogRead(POT_01);
  Serial.println("ADC_A0 is: " + String(ADC_Val));
}

unsigned char Cx=0;
unsigned long PrevTime,NowTime;
byte myChar = '0';
void loop() 
{
  NowTime = millis();
  if(NowTime >= (PrevTime + 100))
  {
    if(Cx==0) digitalWrite(OnBoardLED, HIGH);
    else if(Cx==3) digitalWrite(OnBoardLED, LOW);
   if(Cx == 9)
   {     
    Cx = 0;  
    POT_read(); 
   }else Cx++;
   PrevTime = NowTime;
  }
}


void serialEvent() {
  while(Serial.available()) {
    // get the new byte:
    unsigned char inChar = Serial.read();
    Serial.write(inChar);
  }
}