Extra pins
• Limit switch pins have been doubled up so that each axis has a “Top/+”
and “Bottom/-”. This makes it easier to install two limit switches for each
axis. (For use with a normally open switch)
• E-Stop – These pins can be connected to an emergency stop switch.
This does the same as the RESET button on the Atmega328p board. (It
is advisable that an extra EMERGENCY BUTTON is also installed that
cuts power to all machinery.
• Spindle and coolant control has their own pins.
• External GRBL Command Pins have been broken out allowing you to
add buttons for Pause/Hold , Resume and Abort.
• Serial Pins (D0-D1) and I2C Pins (A4-A5) have their own break-out pins
for future extensions. I2C can later be implemented later by software to
control things like spindle speed or heat control.
• Version 3.00 of the board added jumper to configure the 4th axis (Clone
the other axes or run from Pins D12-D13), Comm Header (RX+TX, I2C)
and a Stepper Control Header (All Pins needed to run 4 steppers).
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