NanoGRBL 3Axis Controller V1.0

NanoGRBL 3Axis Controller V1.0

 Product Overview

The NanoGRBL 3Axis Controller V1.0 is a compact, reliable and feature-rich CNC motion controller designed around the proven Arduino Nano (ATmega328P) platform running the open-source GRBL firmware.

Unlike conventional CNC shields, NanoGRBL integrates all essential circuitry onto a single professionally designed PCB, eliminating the need for external power modules, protection circuits, or additional interface boards.

Whether you are building a desktop CNC router, laser engraver, drawing machine, PCB milling machine, mini plasma system or automation project, NanoGRBL provides everything required for a clean and reliable installation.

The controller supports three independent stepper motor axes using industry-standard A4988 plug-in driver modules, dedicated spindle and coolant outputs, laser PWM control, integrated power protection, and convenient plug-and-play connectors.

Key Features

Complete 3-Axis GRBL Motion Controller

Supports

• X Axis
• Y Axis
• Z Axis

Compatible with standard GRBL firmware for Arduino Nano.

Integrated Stepper Driver Sockets

Supports three plug-in A4988 stepper driver modules.

Features

• Easy replacement
• Adjustable motor current
• Microstepping support
• Industry standard footprint
• Replace driver without replacing controller

Compatible Motors

• NEMA17
• NEMA23 (within driver ratings)
• Bipolar Stepper Motors

Onboard High Efficiency DC-DC Converter

Unlike standard CNC shields that require external regulators, NanoGRBL includes a dedicated onboard switching power supply.

Specifications

Input: 12V DC

Output: 5V DC

Maximum Output Current: 3A

This supply powers

• Arduino Nano
• Logic circuitry
• Limit switches
• External sensors
• Control buttons

without requiring an additional regulator.

Built-in Protection Circuitry

Integrated Protection includes

✔ Reverse polarity protection

✔ Replaceable input fuse

✔ Power filtering

✔ Separate logic power regulation

These protections significantly reduce the chance of accidental damage during installation.

Dedicated Limit Switch Inputs

Three dedicated connectors for

• X Limit
• Y Limit
• Z Limit

Each connector provides

• GND
• Signal
• +5V

Suitable for

• Mechanical switches
• Optical sensors
• Hall sensors
• Proximity sensors (with compatible interface)

Control Button Inputs

Dedicated connectors for

• Resume
• Feed Hold
• Abort

Allows direct connection of industrial push buttons without additional wiring.

Each connector provides

• GND
• Signal
• +5V

Laser PWM Output

Dedicated laser PWM connector.

Suitable for

• Laser engravers
• Laser cutters
• TTL laser modules

Output

PWM Signal

Ideal for variable laser power control using GRBL.

MOSFET Controlled Outputs

USB Type-C Interface  / USB Micro Interface  (Optional)

Modern USB Type-C/ Micro connector provides

• Firmware uploading
• GRBL communication
• CNC control via USB
• Arduino programming

Compatible with standard USB-C cables.

Applications

NanoGRBL is suitable for

• CNC Routers
• Laser Engraving Machines
• Laser Cutters
• PCB Milling Machines
• Mini CNC Machines
• Foam Cutting Machines
• Plotters
• Drawing Robots
• Pick and Place Projects
• Educational CNC Systems
• DIY Automation Projects

Hardware Specifications

Parameter	Specification
Controller	Arduino Nano (ATmega328P)
Firmware	GRBL
Motion Axes	3
Stepper Drivers	3 × A4988 Plug-in Modules
Motor Type	Bipolar Stepper Motors
Logic Voltage	5V
Input Voltage	12V DC
Onboard Regulator	5V / 3A Buck Converter
USB Interface	USB Type-C / Micro USB
Laser Output	PWM
Spindle Output	MOSFET
Coolant Output	MOSFET
Limit Inputs	X, Y, Z
Button Inputs	Resume, Hold, Abort
Reverse Polarity Protection	Yes
Replaceable Fuse	Yes

Power Connection

Input Voltage: 12V DC

Recommended Supply

12V 5A or higher depending on motor size.

Power is supplied through the screw terminal.

Observe correct polarity before switching ON.

Stepper Driver Installation

Install three A4988 driver modules into the corresponding sockets.

Important

Always verify driver orientation before powering the board.

Incorrect installation may permanently damage the driver module.

Adjust motor current according to your stepper motor specifications before operation.

GRBL Compatibility

The controller is fully compatible with

• Universal G-Code Sender (UGS)
• LaserGRBL
• Candle
• OpenBuilds CONTROL

Supports standard GRBL configuration commands.

Safety Notes

• Always disconnect power before installing or removing stepper drivers.
• Verify driver orientation before powering the controller.
• Never connect or disconnect motors while power is applied.
• Ensure adequate cooling for stepper drivers during continuous operation.
• Use properly rated power supplies.
• Replace the fuse only with the recommended rating.
• Disconnect USB before performing hardware modifications.

Package Contents

Standard package includes

• NanoGRBL 3Axis Controller PCB
• Arduino Nano

Optional Accessories

• A4988 Driver Modules
• Heat Sinks
• Cooling Fan
• Stepper Motors
• Limit Switches
• USB Type-C Cable
• Power Supply

Advantages over Standard CNC Shields

Standard CNC Shield	NanoGRBL V1.0
External 5V regulator required	Integrated 3A buck converter
Minimal protection	Reverse polarity & fuse protection
Basic screw terminals	Organized dedicated connectors
No dedicated laser interface	Dedicated Laser PWM output
Limited accessory connections	Integrated spindle, coolant and control ports
Older USB connector	Modern USB Type-C / Micro USB
More external wiring	Clean all-in-one design

Technical Notes

• Designed for GRBL on Arduino Nano (ATmega328P)
• Supports plug-in A4988 stepper drivers
• Compatible with standard GRBL pin mapping
• Suitable for hobby, educational and light industrial CNC applications
• Compact PCB layout with integrated protection and power management