All I/O pins on the board. And descriptions..?

Bertus Kruger
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Re: All I/O pins on the board. And descriptions..?

Post by Bertus Kruger » Tue May 07, 2019 7:19 pm

berin wrote:
Thu Feb 14, 2019 11:54 pm

""Those are pin grbl dont use??"" I have no idea what that means... What is the function of these 3, how are they being used? because they are only directly connected to the mega and nothing else, That being said then why are the via's on the board then if they are something not to touch etc... are they for software debugging? are those addresses being used in software?
MEGA328P A4=pin 27, A6=pin 18, A7=pin 22

Plus i'm still wondering about the last question I posted asking about if the board with external drivers is active high or active low? is it 5v or 3.3v for active high? or is it -5v or -3.3v for active low? And is there a firmware build that has the 4th axis as indipendent control instead of mirror? I've read a number of post's but never found a firmware. or details on exactly how to get it done.
GRBL is compatible with Arduino Uno's. Arduino UNO's don't expose those pins but I thought I would expose them incase anyone wanted to write their own code with them.

The Step and Dir are active low(0V) and running at 5V level.

There are unofficial GRBL versions what have more axes.

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