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 and the HomeAssistant 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:

dtoverlay=i2c-fan,emc2301,i2c_csi_dsi

CM5

Uncomment the following line:

dtparam=i2c_arm=on

Add the following under the [all] section:

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:

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:

dtoverlay=gpio-shutdown,gpio_pin=20,active_low=1,gpio_pull=off

BOM

See the Interactive BOM (provided by InteractiveHtmlBom) .

PCB Fabrication and Assembly by PCBWay

I am proudly sponsored by PCBWay, 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