Re: Spare Inputs on Clock?

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I’m looking to use PC5, input #27 (according to the PDF file). When I code in this:

int a5ExternalInputPC5 = 27; // external inputs

  pinMode(a5ExternalInputPC5, INPUT);           // set pin to input
externalInPC5 = digitalRead(a5ExternalInputPC5);   // read the input pin

      if(externalInPC5 == 1){
        Serial.println(“External PC5 Pressed”);


It is showing as constantly being pressed. I don’t have anything connected to any of the PC5 or other extra ports.  Can you point me in the right direction?  Thanks.