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Overview

The PiBot FluidNC ESP32 GRBL CNC Controller V4.9 Plus is designed to control a wide variety of CNC machines, supporting up to 6 motors and multiple spindle/laser types. It is user-friendly, requiring no software compilation, with all configuration and upgrades done via a web browser. Compatible with the official FluidNC firmware, it includes a YAML configuration file for easy setup.[](https://www.pibot.com/pibot-fluidnc-grbl-cnc-controller-v4-9)

This controller is ideal for CNC enthusiasts and professionals looking for a versatile, open-source solution with robust connectivity options like USB, Bluetooth, or WiFi.

Key Features

Integrated ESP32: Pre-programmed with FluidNC, including a generic configuration.
Motor Support: 6 motor connectors for external stepper drivers (5V signals, separate step, direction, and enable signals).
Spindle/Laser Compatibility: Supports multiple spindle types, including 0-10V controlled spindles, RS485, and laser setups. Multi-spindle arrangements possible.
Inputs: Supports limit switches, probes, and control switches.
Communication Modes: USB Type-C, Bluetooth, or WiFi (external antenna required for V4.9 Plus B).[](https://www.elecrow.com/pibot-fluidnc-grbl-cnc-controller-v4-9.html)
Driver Compatibility: Works with PiBot Stepper Motor Driver Rev2.3 (TOSHIBA TB6600, 3.3V/5V, max output 4.12–4.5A) and PiBot Isolated Relay Board Rev2.3.[](https://www.ebay.com/itm/176676858686?chn=ps&mkevt=1&mkcid=28&google_free_listing_action=view_item)
GPIO Flexibility: GPIO 26 can be configured as relay output or input via jumper settings.[](https://www.pibot.com/pibot-fluidnc-grbl-cnc-controller-v4-9)
2025 V4.9 Plus B Enhancements:
- Voltage level selection (3.3V or 5V) for onboard driver control.
- Support for TMC2130 and TMC5160 drivers (unlike V4.9P).[](https://www.elecrow.com/pibot-fluidnc-grbl-cnc-controller-v4-9.html?=ericaedm)
- External antenna for improved WiFi stability.[](https://www.ebay.com/itm/176676858686)

How to Connect

1. **Power Supply**: Connect via USB Type-C to the mainboard and power with 12
     V or 24V (9–30V acceptable).[](https://www.pibot.com/pibot-fluidnc-grbl-cnc-controller-v4-9)
2. **Antenna Setup**: For V4.9 Plus B, use an external IPEX-to-SMA antenna for WiFi. The onboard antenna is not available.[](https://www.elecrow.com/pibot-fluidnc-grbl-cnc-controller-v4-9.html)
3. **Motor Connections**: Use the 6 motor connectors for external stepper drivers with 5V signals.
4. **Spindle/Laser**: Connect spindles or lasers (e.g., RS485, 0-10V, or relay-controlled).
5. **Switches**: Attach limit switches or probes to the input ports.
6. **Jumper Configuration**: Set the 3-pin jumper labeled "Driver Logic Signal Level" for 3.3V or 5V operation.[](https://www.elecrow.com/pibot-fluidnc-grbl-cnc-controller-v4-9.html?=ericaedm)

Configuration

1. **Firmware**: Download the latest FluidNC firmware from the official website (compatible with PiBot).[](https://www.pibot.com/pibot-fluidnc-grbl-cnc-controller-v4-9)
2. **YAML Setup**:
   * Upload the provided YAML configuration file via a web browser.
   * Test the configuration and modify it based on your CNC machine’s requirements.
3. **Installation**:
   * Connect the board to your computer via USB Type-C.
   * If the firmware doesn’t install automatically, press the boot button for 3 seconds to trigger download.[](https://www.pibot.com/pibot-fluidnc-grbl-cnc-controller-v4-9)
4. **Advanced Testing**:
   * Use an oscilloscope to verify PWM waveform changes.
   * Test limit switch triggering with an OpenBuild controller or OLED display.[](https://www.pibot.com/pibot-fluidnc-grbl-cnc-controller-board-rev4-6)

Additional Resources

Official Documentation: Visit PiBot V4.9 Plus Page for detailed specs and downloads.
Firmware Updates: Check FluidNC Official Website for the latest firmware.
Support: Refer to PiBot Documentation for YAML templates and setup guides.

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