GRBLDuino Mega Shield Relay - Kit

  • Model: GDMSV2_K
  • Shipping Weight: 0.4375lbs
  • 9 Units in Stock


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This is a non-stock item and will ship in approximately 2 weeks after ordering.

GRBLDuino Mega Shield Relay is the first user friendly GRBL v1.1 compatible 3-axis Arduino CNC controller shield with spindle and coolant control relays.

Available in kit form, which requires soldering of standard through-hole components, or assembled and tested.


  • Fits Arduino Mega (not included)
  • Designed for Pololu DRV8825 stepper motor drivers (not included)
  • Works with power supplies up to 45 volts DC
  • Relays for up to 5 amps at 250v for spindle and coolant control
  • Screw terminals for all machine control connections
  • Dual end stop terminals for each X, Y, and Z axis
  • High or low activation limit switches/end stops
  • Emergency stop, abort, door safety, hold, and resume connections
  • Spindle speed (PWM), enable, and direction connections
  • Flood and mist coolant connections (relay controlled and non)
  • Probe connection
  • 3 axis capability
  • Full microstepping control for each axis
  • Genuine Nichicon capacitors

To have a complete CNC machine, you also need:

  • 1 control computer (to send G code to GRBL)
  • 1 Arduino Mega running GRBL v1.1
  • 1 stepper motor driver per axis (pin compatible with Pololu DRV8825)
  • 1 stepper motor per axis
  • 1 stepper motor power supply (max 45v DC)
  • 1 spindle, pen, laser, drag knife
  • 1 CNC machine structure

Find more details including schematics, parts lists, and tutorials at the blog.

Colors may vary. Arduino not included. Stepper drivers not included.

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