  int btn[] = {btn0, btn1, btn2, btn3};
  int led[] = {led0, led1, led2, led3};
 
+ String recString = "";
+ boolean newAvail = false;
+
 void setup() {
  Serial.begin(9600);
  pinMode(btn0, INPUT);

 // put your setup code here, to run once:
  const int btn0 = 2;
  const int btn1 = 7;

 pinMode(led1, OUTPUT);
 pinMode(led2, OUTPUT);
 pinMode(led3, OUTPUT);
 recString.reserve(200);
 Serial.println("-----Start-----");
 
}

