Pi Rack v3

This is version 3 of my rack of Raspberry Pis that I use primarily for Ubuntu raspi kernel development, testing and debugging. It currently contains eleven DUTs and one controller Pi as listed below.

The controller Pi to the far right runs off an SSD attached to a X857 mSATA HAT. It connects to the serial consoles of the DUTs via the USB hubs and USB-to-serial converters and runs conserver to provide remote access. Power to the DUTs is controlled via GPIOs on the controller Pi that are connected to custom-made USB power switches. Additional GPIOs of the controller Pi are also connected to the GPIO4 pins of the DUTs to force them to boot into an OS installer which pulls the specified image from the controller Pi and writes it to the SD card. Controlled is all this via a simple REST API of the controller Pi.

Bare 'Rack'

From top to bottom:

• A top hat DIN rail to accomodate the Pis
• A 16-port gigabit Ethernet switch
• Two daisy-chained powered USB hubs for a total of 13 USB ports
• Two daisy-chained power strips for a total of 15 power outlets

Front

Fully Loaded

Fully loaded with (from left to right):

• Pi 4B 8GB (rev 1.4)
• Pi 4B 4GB (rev 1.2)
• Pi 4B 4GB (rev 1.1)
• Pi 400 4GB
• Pi CM4 4GB (no EMMC, with wifi, in official CM4 IO board)
• Pi CM3+ 1GB (no EMMC, in official CM3 IO board)
• Pi 3A+ 512MB
• Pi 3B+ 1GB
• Pi 3B 1GB
• Pi 2B 1GB
• Pi Zero 512MB
• Pi 4B 2GB (rev 1.2, controller Pi)

Front	Back

With Power Supplies

Front	Back

Fully Cabled Up

Front	Back

In Action

Front