A modular FluidNC controller for multi-axis CNC, laser and custom motion systems using external Step / Direction drivers.
V5.77 combines six dedicated motor-signal groups with six configurable Extra I/O signals that can become two additional Step / Direction / Enable groups. Add a compatible plug-in ESP32-S3 module, choose the external drivers required by the machine, then configure the controller through FluidNC's Wi-Fi WebUI and readable YAML file.
6 + 2up to eight configured axes
10 Inputslimits, probe and controls
FluidNCWi-Fi WebUI + YAML
2× USB-Cmain + secondary interface
12–24 Vcontroller power input
MODULAR CARRIER DESIGN
Build the controller around your machine
The carrier handles motion signals, inputs, spindle/laser control and expansion. The ESP32-S3 module and motor drivers remain replaceable, making V5.77 a practical choice for machines that already use full-size external drivers.
Driver strategyUse external Step / Direction drivers selected for the motor voltage, current and cabinet design.
Important before ordering
V5.77 requires a compatible plug-in ESP32-S3 module and external motor drivers. Product photos show possible configurations; check the product options above for the exact package contents.
Why Choose V5.77?
⇄ Replaceable ESP32-S3 moduleThe controller module plugs into the carrier instead of being permanently soldered to it. This keeps the familiar V4.7B carrier concept while moving to ESP32-S3 hardware.
⚙ Six dedicated + two configurableSix physical motor groups are always available. The six Extra I/O signals can be grouped into two more EN / STP / DIR sets when the machine needs up to eight axes.
⚡ Complete tool-control interfacesFour 5 V PWM/digital signals, adjustable 0–10 V, Forward/Reverse control, RS485 and two light-load MOSFET channels cover common spindle, laser and accessory workflows.
???? Browser-based FluidNC setupUse the Wi-Fi WebUI for status, jogging and file management. Most machine changes are made in a readable YAML file without recompiling firmware.
Understanding the 6 + 2 Axis Design
V5.77 has six dedicated external-driver connectors plus six Extra I/O signals. Those six extra signals can be arranged as two additional Step / Direction / Enable groups, or they can remain ordinary configured outputs.
6 dedicated motor groupsPH2.0 connectors · EN + STP + DIR + GND
XYZABC
+ 2 configurable groupsSix Extra I/O signals → two EN / STP / DIR groups
Axis 7Axis 8
One configuration at a time: the Extra I/O signals can be two additional motor groups or ordinary outputs. The same six signals cannot perform both roles simultaneously. Axis letters, ganged motors and output functions are defined by the active firmware configuration.
FluidNC Ready — The Main Firmware
FluidNC is the primary workflow for V5.77. It turns the plug-in ESP32-S3 module into a network-connected motion controller and keeps the machine definition in a text-based YAML file. Start with PiBot's supplied V5.77 bench-test YAML, verify the board from top to bottom with the Wiki, then create a separate machine-specific YAML for the final mechanics and wiring.
Wi-Fi WebUIJog, upload and run files, view status and manage configuration from a browser on a computer, phone or tablet.
Readable YAMLConfigure axes, ganged motors, limits, probe, spindle, laser, network and accessories without recompiling normal machine settings.
USB-C + microSDUse the main USB-C connection for setup and communication, the secondary USB interface for supported workflows, and microSD for local storage.
Step-by-step PiBot tutorialFollow installation, YAML upload and guided checks for inputs, motor LEDs, PWM, MOSFET, laser, 0–10 V and RS485.
Also supports grblHAL: V5.77 can use a compatible ESP32-S3 grblHAL build and V5.77 board map. FluidNC YAML files do not configure grblHAL; use the setup method and feature selection for the chosen firmware.
Hardware at a Glance
The current numbered pinmap below shows the actual V5.77 connector groups, voltage-selection jumpers and signal assignments used by the supplied test configuration. Click the image for the full-resolution version.
Current V5.77 pinmap — click to open the full-resolution image.
Ten machine inputsTen 3-pin input headers can be assigned to limits, probe, tool setter, controls and other functions. The switch-supply jumper selects 5 V by default or main VIN when required by documented sensors.
GPIO38 / GPIO48 selectionDifferent ESP32-S3 module revisions use GPIO38 or GPIO48 for the module LED. The board jumper selects the available signal; the PiBot test YAML uses GPIO38 as an input by default.
Visible diagnosticsInput, motor-signal, PWM, MOSFET, RS485 and power LEDs support guided checks before connecting the final machine loads.
External Motor Drivers & Logic Selection
V5.77 is designed for external motor drivers and has no on-board StepStick sockets. Six PH2.0 groups carry Enable, Step, Direction and Ground. The I2SO logic-voltage jumper is set to 5 V by default and can be moved to 3.3 V only when required by a compatible driver interface.
Industrial external driversPair the signal outputs with compatible TB/DM-style drivers selected for the motor current, voltage and cabinet environment.
PiBot external modulesUse compatible PiBot external driver products when a modular cable-based arrangement suits the build.
Machine-specific setupSet driver current and microstepping at the driver, then configure steps/mm, rates, acceleration and axis mapping in the firmware.
Do not connect motors directly to the carrier. The PH2.0 connectors carry control signals for external drivers, not motor winding current.
Spindle, Laser and Auxiliary Control
Four 5 V PWM / digital signalsGPIO4, GPIO5, GPIO45 and GPIO46 provide configurable 5 V signal paths for supported PWM, laser and digital-output uses.
Adjustable 0–10 VGPIO6 drives the analog speed command, with GPIO7 and GPIO8 available for configured Forward/Reverse control.
Standard RS485On-board RS485 supports configured Modbus RTU equipment such as compatible VFDs. V5.77 RS485 is standard and non-isolated.
Two MOSFET channelsGPIO4 and GPIO5 also control matching low-side MOSFET outputs. The test YAML uses M7 and M8 for a simple bench check.
MOSFET limit: 1.5 A maximum per channel
Use these outputs only for suitable light DC loads. A pump, solenoid, larger fan or other heavier/inductive load should be switched through an external relay, SSR or suitable power driver. Overloading a channel can burn the MOSFET.
Display, Pendant and Expansion
V5.77 provides independent connectors for an I2C OLED and the RJ12 pendant/I/O-expander interface, so both can be configured at the same time. The current PiBot pendant can communicate through its Wi-Fi or built-in Bluetooth workflow; a compatible wired RJ12 connection remains available when required.
Wi-Fi pendant workflowUse the current pendant's network connection for the supported wireless workflow.
Built-in Bluetooth optionUse the pendant's built-in Bluetooth mode when selected. No separate Bluetooth converter module is required.
Wired RJ12 + OLEDConnect compatible PiBot wired accessories using the documented pinout. V5.77's OLED and RJ12 interfaces are independent.
V5.77 Specifications
Item
PiBot V5.77 Carrier
Controller module
Replaceable plug-in ESP32-S3 module
Main firmware
FluidNC with Wi-Fi WebUI and YAML configuration
Additional firmware
grblHAL with a compatible ESP32-S3 build and V5.77 board map
Motor outputs
6 dedicated external EN / STP / DIR / GND groups + 6 Extra I/O signals configurable as 2 more motor groups; up to 8 configured axes
Motor drivers
External drivers only; no on-board StepStick sockets
Driver logic
I2SO logic selectable by jumper: 5 V default or 3.3 V
Inputs
10 configurable 3-pin inputs; switch supply selectable between 5 V default and main VIN
PWM / digital
4 configured 5 V signal paths: GPIO4, GPIO5, GPIO45 and GPIO46
Spindle / laser
PWM, laser control, adjustable 0–10 V, Forward/Reverse alternatives and configured Modbus RTU over RS485
RS485
Standard non-isolated transceiver
MOSFET outputs
2 low-side channels via GPIO4 / GPIO5, 1.5 A maximum per channel; external relay/power driver required for heavier loads
USB / storage
2× USB-C interfaces and microSD card socket
Display / expansion
Independent I2C OLED and RJ12 pendant/I/O-expander interfaces
Controller power
12–24 V DC, correctly polarized; 24 V is recommended for normal controller use
PCB
2-layer carrier board
What Is Included?
Check the selected packageThe exact contents are determined by the product options above. Do not assume every item shown in a product illustration is included.
Required for operationA compatible plug-in ESP32-S3 module, suitable external motor drivers, a correctly sized power supply and wiring for the machine.
Optional accessoriesCables, OLED, pendant, I/O expander and external driver products are included only when the matching option is selected and available.
Before ordering: confirm the ESP32-S3 module type, driver signal level, number of motors, sensor voltage, spindle/VFD interface and selected accessories.
FluidNC Installation Video
V5.77 Carrier and V5.88 Ultra use the same FluidNC upload procedure shown below. The operating steps are shared, but always use the firmware package and config.yaml intended for V5.77.
Current V5.77 Schematic
Current V5.77 schematic preview — click the image to open the complete PDF.
Before First Power-On
Use 12–24 V DC only and verify VIN/GND polarity before applying main power. Main power is required for a complete carrier-board test.
Install or remove the ESP32-S3 module, jumpers, OLED, RJ12 accessories and driver wiring only while power is off.
Keep the default 5 V I2SO logic setting unless the connected external driver specifically requires 3.3 V.
Test motor signals before connecting motors, and verify PWM/laser/0–10 V/RS485 before connecting the final spindle, VFD or laser load.
MOSFET limit: 1.5 A maximum per channel. Use an external relay, SSR or suitable power driver for heavier loads.
The supplied XYZABC YAML is a bench-test profile, not a finished machine configuration. Create a separate machine YAML before homing, cutting or engraving.
Quick Buyer FAQ
Is this an eight-axis board?It has six dedicated motor groups. Six Extra I/O signals can be configured as two additional Step / Direction / Enable groups, giving up to eight configured axes. Those signals cannot remain ordinary outputs at the same time.
Does it include the ESP32-S3 module?Package contents depend on the product option selected above. V5.77 requires a compatible plug-in ESP32-S3 module; check the selected package before ordering.
Can motors connect directly to the board?No. V5.77 outputs Step / Direction / Enable control signals for external drivers. Select drivers that match the actual motors and power supply.
Can it run a spindle or laser?Yes. The hardware provides PWM/digital signals, laser control, adjustable 0–10 V, Forward/Reverse alternatives and standard RS485. The usable combination depends on the active firmware configuration and connected equipment.
Does it work with LightBurn?LightBurn officially lists FluidNC and grblHAL among its supported GCode controller firmware. Correct laser-output configuration and machine safety checks are still required.
Is the supplied YAML ready for cutting?No. It is a board-level test file designed to exercise the V5.77 interfaces. Copy it and create a machine-specific configuration for the actual motors, limits, travel, spindle/laser and safety hardware.
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