Introducing GRBLDuino Mega Integrated

The latest project is integrating a GRBLDuino Mega Shield with an Arduino Mega – no more shield! The entire system is now contained in one easy to use board: the GRBLDuino Mega Integrated.

It has all of the same features as the GRBLDuino Mega Shield:

Features

  • Smaller than an Arduino Mega – 3.5″ x 2.3″ (89 x 58 cm).
  • CP2102 USB to UART interface – shows up as a serial port and works with Arduino IDE
  • On board reset button.
  • Designed for Pololu DRV8825 stepper motor drivers and are compatible with all pin-compatible equivalents.
  • Maximum input voltage of 45 volts DC
  • Jumper selectable high/low limit switch activation.
  • RC filters on limit switch and probe inputs.
  • All machine connections are broken out to screw terminals.
    • + and – Limit switches for each X, Y, and Z axis.
    • Resume, Hold, Abort, Emergency Stop, Door Safety support.
    • Flood and Mist coolant connections.
    • Spindle Enabled, Direction, and Speed (PWM) connections.
    • Probe connection.

Schematics

The schematic is pretty straightforward – it shows all of the internal connections on the board and external connectors.

Bill of Materials

  • 1x GRBLDuino Mega Integrated PCB
  • 1x ATMega2560
  • 1x CP2102
  • 1x 16MHz crystal
  • 1x micro B USB jack
  • 18x Two position screw terminal blocks
  • 6x 1×8 female pin headers
  • 1x 1×3 male pin headers
  • 3x 1×4 male pin headers
  • 4x 2×3 male pin headers
  • 1x 6mm tactile switch
  • 1x 680 ohm resistor network
  • 5x 10k ohm resistors
  • 1x 1k ohm resistor
  • 3x 100uF, 50v Nichicon capacitors
  • 3x 22pF capacitors
  • 4x 0.15uF capacitors
  • 6x 0.1uF capacitors
  • 1x 1uF capacitor
  • 1x green LED
  • 9x short 2 pin jumper shunts
  • 1x long 2 pin jumper shunts

Gerber Files

For those wishing to make their own board, the Gerber files are provided. There are no guarantees made to accuracy or completeness of these files.

Availability

I anticipate these being available for sale through a few outlets beginning in early June. Kits will sell for around $36 shipped in the US and assembled boards will sell for around $61 shipped in the US. Once available, the best price will be at the Eccentric Workshop store, but they will also be on Tindie and eBay.

Future Versions

Version 2 will likely add in relay drivers on the coolant and spindle enable lines to control external devices. If there is enough demand, I would explore creating a 6 axis version also.

 

GRBLDuino Mega Shield V1

The GRBLDuino Mega Shield V1 is a 6 axis capable CNC controller shield for Arduino Mega systems running GRBL-Mega. Although the official release doesn’t support more than three axes, there are variants available supporting up to 6.

Shortly after starting the GRBLDuino Uno Shield, I came across some postings about the end of life for GRBL on the Arduino Uno since it is at maximum capacity. The next logical step was to move up to the Arduino Mega version as it had plenty of room for future expansion (and there are a few 6 axis branches out there).

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GRBLDuino Uno Shield V1 Assembly Guide

The GRBLDuino Uno Shield is easy to assemble with basic soldering skills. All parts are standard through hole components to make assembly easier and quicker. Assembly should take between 30 minutes to an hour for someone of moderate experience. These are for sale through a few outlets. The best price will be at the Eccentric Workshop store, but they are on Tindie and eBay.

Bill of Materials:

  • 1x GRBLDuino Uno Shield PCB
  • 15x Two position screw terminal blocks
  • 8x 1×8 female pin headers
  • 1x 1×3 male pin headers
  • 4x 1×4 male pin headers
  • 1x 1×6 male pin headers
  • 2x 1×8 male pin headers
  • 1x 1×10 male pin headers
  • 2x 2×4 male pin headers
  • 4x 2×3 male pin headers
  • 1x tactile switch
  • 1x 10k ohm resistor
  • 1x 680 ohm resistor network
  • 4x 150nF ceramic capacitors
  • 4x 100uF electrolytic capacitors (genuine Nichicon)
  • 12x short 2 pin jumper shunts
  • 3x long 2 pin jumper shunts
  • 12x short 2 pin jumper shunts
  • 3x long 2 pin jumper shunts

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GRBLDuino Shield CNC Controller

Over the past few days I’ve been designing a Arduino Uno CNC controller shield.

My requirements were pretty simple:

  • GRBL 1.1 compatible
  • Pin compatible with Pololu DRV8825 drivers
  • User replaceable stepper motor drivers
  • Screw terminals for connections
  • E-Stop, Abort, Hold, and Resume buttons
  • Probe connection
  • Spindle PWM control
  • User selectable 4th axis function (clone or separate)
  • No SMD packages in the first version

Arduino CNC shields are pretty easy to find (and shockingly cheap) but not many are compatible with the changes in GRBL 1.1. I didn’t want a product that was out of date before I even purchased it.

My design is loosely based on the Protoneer Arduino CNC Shield. I fully support the purchase of the Protoneer product but it is hard to get in the US – available only from his eBay store.

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