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

loop增加喂狗调用

void loop() {
……
Reversewdt();//喂狗
}