• Cut the Raspberry Pi mounting bracket to fit snuggly above the switch.
• Screw the Pi to the bracket with four screws & nuts.
• Add some sticky foam to the underside of the bracket (optional).
• Mark out where the holes in the mount line up inside the BBU enclosure.
• Hot glue the long stand offs that came with the bracket to the enclosure where you marked.
• Screw the bracket to the enclosure.

This is the wiring part. Just follow the schematic.

• Plug in the Pi's USB cable for power.
• Plug the short patch cable into the Pi & the other end into the switch.
• Plug the patch cables coming from the RJ45 jacks into the switch.
• Plug the red wire from the LED into pin 32 (GPIO 12).

• Plug the black wire from the LED into pin 30 (ground).

• Plug the wire with the resistor from the button into pin 1 (3.3V).
• Plug the wire attached to the same lead on the button as the resistor into pin 36 (GPIO 16).
• Plug the last wire from the button into pin 34 (ground).
• Plug in the USB WiFi adapter.

The final hardware portion of the build is to trim and fit the rest of the enclosure. Basically just use some end snips and a file or a Dremel tool to cut away at any plastic that gets in the way of buttoning up the enclosure.

Here we are setting up the Pi's OS and some of the code I used for the button and LED. You will need to be somewhat comfortable editing files in Linux.

• Install Kali Linux to the Raspberry Pi's SD card. Go HERE (Kali Linux's Website) to get the instructions for whatever board you are using.
• Download my scripts to the Pi, change the extension from ".txt" to ".sh", & make them executable.
• Add a crontab entry to start the scripts at boot. In /etc/crontab file, add:

  # Flash LED after successful boot @reboot root sleep 10s && bash /opt/scripts/flashled.sh &> /dev/null # Enable power button @reboot root sleep 10s && bash /opt/scripts/powerbutton.sh &> /dev/null

  • Change the directory & name of the scripts to match where you put them & what you named them.

• Optionally, run sudo systemctl disable lightdm.service to boot Kali without a gui & save some resources.

That's everything you need to get a Raspberry Pi running inside an old BBU!

I eventually want to add a relay and button to turn on and off power to the outlets on top. A couple of lithium batteries and a piezo buzzer would be kool, too.