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How do I access the Servo expansion ports of the Azteeg X3 controller?

Darren Suprina

June 20, 2016 22:44

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Greetings -

I'm doing some experimentation with my Gigabot in an effort to expand the number of extruders, add bed leveling, etc.  On the Azteeg X3 controller's daughter card two Servo ports are broken out as pins, along with two +5 and two Ground pins.  The top-middle Servo expansion pin is D44, and it can be easily accessed within the board's firmware with a command like this:

#define DRS_D44_PIN 44  // RESET.

pin_selected = DRS_D44_PIN;

digitalWrite(pin_selected, HIGH);

But... on the Panucatt documentation for V2 of the controller the bottom-middle Servo expansion pin is listed as D55 in the schematic.  I don't believe there is any such Arduino Mega pin.  So, anyone know how to address this Servo expansion pin?

I've tried emailing and calling Panucatt but they have not been responsive.  Anyone know this?

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3 comments

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  Manmeet July 13, 2016 02:29

  Are you using the original Azteeg? I would venture to say the newer V2 board might use a pin expanding chip perhaps? Would like to hear if you found out more about this

   

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  Darren Suprina July 13, 2016 19:25

  The v2 schematic suggests that the 2nd servo expansion pin is associated with expansion pin D55 of the processor. Unfortunately no such pin seems to exist. Now there could be a port expansion chip onboard the Panucatt card (or daughter card) but I doubt it as all of the I/O pins of the microprocessor are otherwise accounted for. So... Still at a loss to access and use the expansion. Will have to keep digging...

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  Manmeet July 14, 2016 00:51

  Have you been able to make use of any of the free pins on the original board?

  This also might be of use to see the difference between boards (from the OpenGB kickstarter)

  https://drive.google.com/file/d/0B7rkxUXGvCEGb1FIWlZ1elFJTDA/view