void Reversewdt(){ //硬件喂狗，11PIN接MAX824L芯片WDI
 
if (digitalRead(11) == HIGH) 
{
    digitalWrite(11, LOW);    //低电平
  }  
else 
{
    digitalWrite(11, HIGH);   //高电平 
  }

void loop() {
……
Reversewdt();//喂狗
}