Tall Case for Raspberry Pi 4 and UPS HAT

thingiverse

The Raspberry Pi 4 is a terrific little computer and it has enormous potential for use in all kinds of projects. By adding voice input and audio output you don't even need a screen, keyboard or mouse, so any voice-centric app that auto-starts when the Pi is turned on is a perfect candidate for this enclosure. In fact, setting up a Raspberry Pi to auto-run the ChatGPT service using a USB microphone and attached speaker is the perfect use case for a portable RPI. To make it portable I added a UPS HAT so I could take it with me anywhere. All it needs is an enclosure tall enough to fit the pi and the UPS HAT. The inspiration for this, and starting point for the case, comes from the Robotic AI Bear Using ChatGPT project on Adafruit by M. LeBlanc-Williams (https://learn.adafruit.com/robotic-ai-bear-using-chatgpt/overview) Add a connection to your WiFi or phone's hotspot so it can access remote services (i.e. OpenAI and Microsoft Azure Speech Services) and you're good to go. So now as long as your phone can provide a hotspot for the Pi, you can show off your app anywhere! Parts List for tall case: 3D printed parts for the case: 1 x Top 1 x Bottom 2 x Speaker Retainers 4 x screws (M2.5 or M3, x 50mm) 4 x nuts (M2.5 or M3 depending on the screws) 2 x small screws for the speaker retainers Raspberry Pi 4 (any) - $59.99 on AliExpress UPS HAT - $23.99 on Amazon (Waveshare UPS HAT for Raspberry Pi) 2 x 18650 rechargable batteries Mini speaker - $1.95 on Adafruit 3W I2S Audio Amp - $5.95 on Adafruit (MAX98357A) Mini USB Microphone - $5.95 on Adafruit 5 x Dupont wires, one end female, other end doesn't matter, it will be cut off Case Assembly: The bottom will have four holes for the nuts. I used M3 screws so the nuts are a bit of a tight fit and had to be pressed into the holes. It's a little tight but they will fit. Also, for M3 screws the holes for the screws may have to be cleaned out a bit using a 3mm drill bit. Attach the UPS HAT to the RPI using the 2X20 pin connector. Once the two boards are attached push the back of the two boards, the opposite side from the USB ports, into the bottom and push it in making sure the side ports go into their respective holes. Screw the top on and you're good to go.