unsigned char value;
unsigned char adcPin = A0;
unsigned int adcValue;

void setup() 
{
  // put your setup code here, to run once:
  pinMode(A0, INPUT);
  Serial.begin(19200);
  Serial.println(":OnLine\r\n");
}

void loop() 
{
  // put your main code here, to run repeatedly:
  //Serial.println("test serial");

  while(Serial.available() > 0)
  {
      value = Serial.read();
      if(value == 'A')
      {
          Serial.println("Recv");
      }
  }
  adcValue = (analogRead(adcPin) >> 2);
  Serial.print(adcValue, DEC);
  Serial.println("");
  delay(200);
}