https://github.com/nrwiersma/homelabio
Rack mountable CM4 carrier board
https://github.com/nrwiersma/homelabio
cm4 pcb
Last synced: 5 months ago
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Rack mountable CM4 carrier board
- Host: GitHub
- URL: https://github.com/nrwiersma/homelabio
- Owner: nrwiersma
- Created: 2024-11-30T04:26:29.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2025-11-22T07:36:09.000Z (7 months ago)
- Last Synced: 2025-11-22T09:14:20.559Z (7 months ago)
- Topics: cm4, pcb
- Homepage:
- Size: 33.2 MB
- Stars: 2
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
[](https://github.com/nrwiersma/homelabio/releases)
[](https://raw.githubusercontent.com/nrwiersma/homelabio/master/LICENSE)
`HomeLabIO` is a Compute Module 4/5 carrier board designed to fit in a 19" rack using 1U of space.
Features:
* Power over Ethernet 802.3at (PoE+)
* TPM 2.0 (SLB9670)
* NVMe SSD up to 2280
* HDMI
* USB-C UART communication on the front
* PWM fan
## Why
This is my first attempt at making a PCB and was largely a practical learning experience.
The schematic is heavily inspired by the [Raspberry Pi CM4IO](https://datasheets.raspberrypi.com/cm4io/cm4io-datasheet.pdf)
and the [HomeAssistant Yellow](https://github.com/NabuCasa/yellow).
## Config
### Fan
To configure the fan to run based on the core temperature, change the `/boot/firmware/config.txt` as follows:
#### CM4
Add the following under the `[all]` section:
```ini
dtoverlay=i2c-fan,emc2301,i2c_csi_dsi
```
#### CM5
Uncomment the following line:
```ini
dtparam=i2c_arm=on
```
Add the following under the `[all]` section:
```ini
dtoverlay=i2c-fan,emc2301,i2c_csi_dsi0
```
### TPM2
The TPM2 can be enabled by adding the following line to `/boot/firmware/config.txt` under the `[all]` section:
```ini
dtoverlay=tpm-slb9670
```
### GPIO
The following GPIOs are exposed on the board:
> [!WARNING]
> These SPI GPIOs are shared with other peripherals on the board. Make sure to check for conflicts before using them.
> [!TIP]
> The left hand pins are Raspberry Pi 4 compatible. It is possible to use some Raspberry Pi HATs with this board,
> for instance, the DS3231 Real Time Clock Module.
#### User Programmable Button
The user programmable button is connected to GPIO 20. It can be used for various purposes, such as triggering a shutdown or reset.
For example, to configure the button to trigger a shutdown when pressed, you can use the following configuration in your `/boot/firmware/config.txt`:
```ini
dtoverlay=gpio-shutdown,gpio_pin=20,active_low=1,gpio_pull=off
```
## BOM
See the [Interactive BOM](https://htmlpreview.github.io/?https://github.com/nrwiersma/homelabio/blob/main/bom/ibom.html) [(provided by InteractiveHtmlBom)
](https://github.com/openscopeproject/InteractiveHtmlBom).
## PCB Fabrication and Assembly by PCBWay
I am proudly sponsored by [PCBWay](https://www.pcbway.com/), a leading manufacturer specializing in PCB prototyping,
low-volume production, and PCB Assembly services. Thanks to PCBWay’s sponsorship, I was able to fabricate and assemble
my PCBs with high precision and quality. Their advanced manufacturing capabilities ensured that our design was
translated into a robust and functional product.
### Why PCBWay?
PCBWay offers:
* **High-quality PCB fabrication** with multiple layer options, surface finishes, and material choices.
* **Fast turnaround times** to meet project deadlines efficiently.
* **Affordable pricing** for both prototyping and mass production.
* **Reliable PCB assembly services**, including SMT, through-hole, and mixed assembly.
* **Exceptional customer support** and a user-friendly ordering platform.
### Get Your Own PCBs from PCBWay
I highly recommend PCBWay for all your PCB fabrication and assembly needs. Their dedication to quality and customer
satisfaction makes them an ideal partner for your projects. If you're looking for a trusted partner for PCB fabrication
and assembly, check out PCBWay for your next project.
Special thanks to PCBWay for their generous support!
## Changelog
#### v0.1.0
* Initial schematic and board
#### v0.1.1
* Fix issue with FTDI USB connection
* Fix issue with BOM that specifies a generic fuse
#### v0.2.0
* Move fan port closer to board edge
* Switch UART chipset
* Add UART activity LEDs
* Switch PCIe power management
* Add NVMe LED
* Switch HDMI port for cheaper alternative
#### v0.3.0
* Add TPM2 support
* Add GPIO breakout header
* Add user programmable button
* Moved some components to allow for better manufacturability
* Various silkscreen improvements