---
title: "RP23CNC – RP235x-based 5-Axis grblHAL CNC Controller"
url: "https://maker.wiznet.io/TheoIm/resellers/rp23cnc--rp235x-based-5-axis-grblhal-cnc-controller/"
markdown_url: "https://maker.wiznet.io/TheoIm/resellers/rp23cnc--rp235x-based-5-axis-grblhal-cnc-controller/md"
type: "VAR: Value-Added Reseller Products"
author: "phil barrett"
author_url: "https://www.tindie.com/products/philba/rp23cnc-5-axis-grblhal-controller/"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "phil barrett"
original_url: "https://www.tindie.com/products/philba/rp23cnc-5-axis-grblhal-controller/"
published: "2025-09-24"
language: "en"
hardware: ["WIZnet WIZ610io", "WIZnet WIZ850io"]
likes: 0
views: 1054
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# 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.

Original author: phil barrett (source: https://www.tindie.com/products/philba/rp23cnc-5-axis-grblhal-controller/)

## Components

- **WIZnet WIZ610io** x 1 ([docs](https://docs.wiznet.io/Product/ioModule/wiz610io))
- **WIZnet WIZ850io** x 1 ([docs](https://docs.wiznet.io/Product/ioModule/WIZ850io))

## Article

## 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**

2x UARTs

MicroSD card slot

Ethernet via WIZnet module

**Power Section**

12V main input + isolated input

5V and 3.3V regulators

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## Role of the WIZnet Chip

**Hardware TCP/IP Offloading**: RP235x focuses on motion control, while the WIZnet chip handles all TCP/IP networking.

**Stable CNC Networking**: Enables connection to remote PCs, IoT gateways, or web servers.

**Scalability**: Beyond local control, the WIZnet module allows **network-based CNC + IoT integration projects**.

---

## Development History

**V0.92 (Feb 2025)**: grblHAL boot confirmed, 5-axis motion verified, WIZnet Ethernet networking tested.

**V0.95 (Mar 2025)**: Switched to USB-C, improved power efficiency, fixed UART pin mapping.

**V1.0 (Apr 2025)**: Stable production release, available on Tindie.

---

## Project Use Cases

![](https://maker.wiznet.io/upload/ckeditor5/447084011%5F1758724398%2Epng)

The RP23CNC is not just a controller board – it’s a **flexible platform** that makers can adapt to their own projects:

**Desktop CNC Machines**

Build small CNC machines for wood or acrylic cutting

Control via **web UI without a dedicated PCIoT-enabled CNC Monitoring**

Stream real-time CNC job status through the WIZnet module

Remote monitoring and emergency stop control

**Educational CNC/Robotics Platform**

Teach students G-code and motion control with grblHAL

Manage multiple devices over the network for hands-on learning

**Custom Automation Equipment**

Adapt for laser cutters, pick-and-place systems, or 3D printer conversions

Use digital outputs/relays to drive pumps, motors, or dust collectors

**Remote CNC Farm Operation**

Connect multiple CNCs via WIZnet networking

Centralized management from a server/cloud → **small-scale smart manufacturing**

![](https://maker.wiznet.io/upload/ckeditor5/447084011%5F1758724419%2Epng)

---

## Summary

![](https://maker.wiznet.io/upload/ckeditor5/447089669%5F1758799079%2Epng)

![](https://maker.wiznet.io/upload/ckeditor5/447089669%5F1758799090%2Epng)

https://github.com/phil-barrett/RP23CNC/blob/main/Schematic/V1.0%20schematic.pdf

---

## Summary

**RP235x MCU** → Precise motion control

**WIZnet Ethernet** → Reliable network connectivity

**grblHAL Support** → Large open-source ecosystem

👉 The **RP23CNC** offers makers, researchers, and educators an **affordable yet expandable CNC controller board** that bridges motion control and networked automation.

---

Source: https://maker.wiznet.io/TheoIm/resellers/rp23cnc--rp235x-based-5-axis-grblhal-cnc-controller/