Connector Board for Raspberry Pi 4 and 5, Radxa X4, Radxa ROCK 4C+

The connector board re-arranges all connectors on the side of Raspberry Pi to the back.

It works with both Raspberry Pi 4 and 5. On Pi 5, the audio plug is not populated.

This is part of a larger open source project (Ubo project) that is aiming to build an open source echo system of devices powered by Raspberry Pi. I have also designed a custom enclosure for this.

This also works with any single board computer that keep the same location of side board connectors such as Radxa X4 and Radxa ROCK 4C+.

Features

• Mini HDMI to full HDMI conversion
• MicroSD card reader extender (brings the reader to the back)
• Audio jack insertion detection (via GPIO)
• Internal USB Type A connector that connects to data lines on USB-C
• 2 STEMMA Qt connectors (one internal and one external)
• Power button
• Fan connector
• 2x8 Pin Header that connects to:
  • I2C pins
  • 3.3v and 5v pins
  • Right and left speakers
  • Audio line in (connects to audio jack)
  • Fan control
  • Power button
  • Audio insertion detection pin
  • 1 unused GPIO

The KiCAD design files are made available here:

https://github.com/ubopod/ubo-pcb/blob/main/KiCad/ubo_sideboard_v1.5.2/README.md

What's next?

I am planning to do a new design with this board that converts one of the HDMIs to USB-C Alt mode that carries video.

This variant will have one full HDMI and two USB-C connectors. One of the USB-C connectors will be power-in only and the second one will be power-in, power-out, video/audio out, and carries USB 2.0 data.