我写这个程序是为了检查一些东西，但是对我来说它不起作用。

int counter = 0; 
  int aState;
  int aLastState; 
  int StateAreTheSamePrinted = 0; 
  int StatePrinted = 0;

 void setup() {
  // put your setup code here, to run once:
   pinMode(outputA, INPUT);
   pinMode(3, INPUT);

   Serial.begin(115200);
   aLastState = digitalRead(outputA);
   Serial.print("Arduino started");  
  }

 void loop() {

   // put your main code here, to run repeatedly:
   aState = digitalRead(outputA);

   if(StatePrinted == 0)  
   {
    Serial.print(aState);
    StatePrinted = 1;  
   }    

   if(aState == aLastState && StateAreTheSamePrinted == 0)
   {
    Serial.print("States are the same");       
    StateAreTheSamePrinted = 1;
   }

  if(aState != aLastState)  
  {
    if(aState == 1){
      Serial.print("A is high \n");            
  }
  else
  {
    Serial.print("A is low \n");
  }
  StateAreTheSamePrinted = 0;
  StatePrinted = 0;
 }  
  aLastState = aState;  
}

它总是打印一旦arduino启动，1（输入状态），和状态是相同的，当我电线5v从arduino到端口7，有时它React一次，有时没有，几分钟后，它开始打印输出像50-100行的消息，并停止和滞后再次.
我原以为在给arduino 7端口供电后，它会打印A为高或A为低，并在它们之间切换