1. Arduino程序
   实现功能：发送ON点亮LED灯，发送OFF关闭LED灯

int LED = 13;
String buff="";
void setup() {
  Serial.begin(9600);
  pinMode(LED,OUTPUT);
}

void loop() {
  while(Serial.available()>0)
  {
    buff = buff + char(Serial.read());
    delay(3);
    }
  if (buff=="ON")
  {
    digitalWrite(LED,HIGH);
    Serial.println("LED IS ON");
    buff="";
  }
  else if (buff=="OFF")
  {
    digitalWrite(LED,LOW);
    Serial.println("LED IS OFF");
    buff="";
    }
    delay(50);
  }

3. Labview程序
   在读取之后加了延时是为了解决串口读取时出现的假死现象
   
   

4. 硬件实物图