xbeeカウントアップ-arduino側プログラム

const int leftbutton = 11;
const int ledpin = 10;
int leftbuttonState = LOW;

void setup(){
  pinMode(ledpin,OUTPUT);
  pinMode(leftbutton,INPUT);
  Serial.begin(9600) ;
      digitalWrite(ledpin,HIGH);
}

void loop(){
 
  leftbuttonState = digitalRead(leftbutton);
 
   if(leftbuttonState == HIGH){
     digitalWrite(ledpin,LOW);
     Serial.println("H");
   }else{
      digitalWrite(ledpin,HIGH);
   }
  delay(150);
}