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RP23CNC – RP235x-based 5-Axis grblHAL CNC Controller

RP23CNC is a 5-axis CNC controller board powered by the Raspberry Pi RP235x MCU, running the open-source grblHAL firmware.

TheoIm

Published September 24, 2025

Original author: phil barrett · United States of AmericaOriginal source (new tab)

RP23CNC – RP235x-based 5-Axis grblHAL CNC Controller

Components

Hardware components

Project description

Key Specifications 5-Axis Control Step / Direction / Enable outputs (5V compatible) Limit & Servo error inputs (12V compatible, LED indicators) Standard Grbl Interface Cycle Start, Feed Hold, Halt, Safety Door, Probe inputs LED indicators included Isolated Inputs 12V isolated input section, joinable to main 12V rail Output Expansion Flood, Mist, Aux0–2, Dust Collector Relay Outputs 5V/12V selectable, up to 100mA drive Flood, Mist, Aux0–2, Dust Collector, Spindle Enable Spindle Control PWM-based speed control 0–10V, 0–5V outputs Enable / Direction / PWM (5V compatible) Communication & Storage…

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