Firmware Download

Download or flash firmware for PiBot V3.28 Isolated

Official

GRBL v1.1h

Standard Version
  • ✓ Standard GRBL 1.1h features
  • ✓ Default pin mapping
  • ✓ Supports Spindle Direction

Default pin mapping:

Spindle PWM D11
Spindle Direction D13
Coolant Mist (M7) Disabled by default
Coolant Flood (M8) A3
Custom

GRBL v1.1h Custom

For PiBot V3.28 Isolated
  • ✓ Customized from GRBL 1.1h
  • ✓ Optimized pin mapping
  • ✓ Supports Spindle Enable and Coolant Mist

Custom Pin Mapping:

Spindle PWM D11 (unchanged)
Spindle Enable D13 ← M3/M4 OPEN
Coolant Mist (M7) A4 ← M7 OPEN
Coolant Flood (M8) A3 (unchanged)
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Note: The custom firmware is optimized for PiBot V3.28 Isolated hardware. To build it yourself, edit config.h.

All outputs are active-high. Active-low inputs include X/Y/Z limits, probe, abort, resume, and hold. Short Signal to GND with a jumper to test inputs.

CH340 Driver:If the serial port is not listed, install the CH340/CH341 USB serial driver first. Official Download Local Download

Serial Connection

Connect to the board for live testing and monitoring

Serial Notice Select a serial port to connect the board.
No serial port selected

Serial Terminal

Hardware Test

Monitor board inputs and system information in real time

System Status

Live
State --
Mode --
Spindle Speed --
Coolant State --

Limit Switches

Limit Switches
X
X Limit Inactive
Y
Y Limit Inactive
Z
Z Limit Inactive
Probe Inactive

Button Inputs

Button Inputs
Reset / Abort Normal
Hold / Feed Hold Inactive
Cycle Start / Resume Inactive

Coordinates

Machine / Work Position
X
Machine 0.000
Work 0.000
Y
Machine 0.000
Work 0.000
Z
Machine 0.000
Work 0.000

Jog Control

Jog Control

XYZ Signal Test

EN / DIR / CLK
EN lights during motion DIR changes with direction CLK flashes quickly

Manual Control

Manual Control

Output Test

Output Test
Spindle Output D13 Enable / D11 PWM
Spindle State OFF
Coolant Output A4 / A3
M7 Mist Coolant A4 active-high
M8 Flood Coolant A3 active-high