Maintenance notice: These forum archives are read-only, and will be removed shortly. Please visit our forums at their new location,

Spare Inputs on Clock?

edited September 2013 in Clock Kits
I'm looking at purchasing a Evil Mad Scientist Clock and was wondering if there are spare inputs that could be used by external source triggering.

I'm not actually looking to use this as a clock, but more for a remote display. If it was not possible to have an extra input, would I just not solder in the function buttons to use as external wires in their place?

If that doesn't work, I'm thinking of using a 2nd Arduino to just feed serial data to the clock, but that seems redundant.

Thanks for the support.


  • Hi idreamincode, 
    I suspect that you're asking about the Alpha Clock Five, not the Bulbdial. ;)

    There's no obligation whatsoever to use it as a clock.  You can feed serial data to the clock using a USB-TTL cable, or another Arduino, or use the available spare I/O pins any way that you like.  The current version of Alpha Clock Five has 9 (if i counted correctly) spare I/O pins that can be used as inputs, not counting the two pins that go to the second serial port.

    I hope that this answers your question; if not, please let me know how I can help. :D
  • Yes! That is exactly what I'm looking for, the Alpha Clock Five. Sorry if I posted this in the wrong forum.

    Looking forward to getting my hands on one of these. Very exciting.
  • 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.
  • I figured it out. Pin PC7 actually maps to input 23.

    Pinmap is from this site:

  • Sorry-- didn't see your message until you had already found the answer.  The "canonical" guide is the Sanguino:
Sign In or Register to comment.