xbee无线串口传输问题

HolyWang

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int val;
char buffer[4];
void setup() {
  // put your setup code here, to run once:
lcd.begin(16,2);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  
  if(Serial.available()>0){
      char buffer[]={0};
    Serial.readBytes(buffer, 4);
    Serial.print("buffer: ");
    Serial.println(buffer);
val=atoi(buffer);
Serial.print("val: ");
    Serial.println(val);
if(val<10){
lcd.setCursor(0,0);
  lcd.print("Front obstacle");
  
}
if(val>10){
lcd.setCursor(0,0);
  lcd.print("              ");
  }
}

}


这个是接收端的代码，XBEE已经连接完成了，通过这个代码控制LCD的屏幕，问题出在哪里？