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Specification.txt
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Specification.txt
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GRBL Monster. An over the top PCB for GRBL designed for the SAM D21.
• Fully compatible with Arduino UNO and GRBL.
• Enhanced options for Sparkfun SAMD21 development board
• Four axis stepper drivers using POLOLU stepper boards (A,X,Z and R) with up to two drivers per axis.
o ‘R’ axis drivers can be split in two to create a fifth axis when using the SAM D21 board
• Four limit switch inputs (X,Y,Z and R)
• DIP switches for micro step configuration (A,Y,Z and R)
• Two stepper boards per axis (total of 8).
• Stepper drivers are arranged in two groups of four:
o Mounting holes for one 60mm cooling fan per group.
o Individual or single power supply for each group.
• Four SPI headers for each axis to allow for SPI based stepper drivers.
• Spindle, coolant and probe headers.
• Transistor output option for driving a spindle relay.
• On board 12V regulator for cooling fans and relays.
• Additional header with SPI, UART, Hold, Resume and Reset pins for control buttons or pendant.
• Functional design:
o Easy to implement forced cooling for drivers.
o Power input, driver outputs, limit switches, spindle, coolant, probe and relay outputs are all on one edge of the PCB.
o USB connector, dip switches and pendant header are all on the opposite edge.