None are retired, some see more use than others.
My First Raspberry Pi
This was bought in a sale at Maplins in (I think) 2013. It was in a deluxe starter set with a case, a wireless keyboard with track pad, a WiFi dongle, powered hub and power supply. I bemused the member of staff by checking the Raspberry Pi it was made in the UK.
The Raspberry Pi (1) required a USB WiFi dongle (visible in the photograph above).
It is currently in use as a command line only MariaDB SQL server, though there are a number of other SD cards for it in the SD Card box.
Second Raspberry Pi
This was another sale item from Maplins. This starter set was the base level one that had a conventional wired keyboard and mouse, WiFi dongle, powered hub and power supply.
I also bought another case, similar to the one above.
Later I bought a number of add on boards that I could not get into the case. Maplins (again) had the Pimoroni PiBow cases, and so I bought one of those.
They are made of laser cut acrylic slices that you stack on top of each other and the board is held securely inside). As supplied, there was a clear panel over the top of the board, but by shuffling the top panel to the bottom, you can have an open top that allows access to the GPIO.
Pimoroni now do a range of cases without the top panel, the Breakout Garden Pi Zero makes use of one of them.
This one is used where I want to access the GPIO pins directly. It has been used on the Raspberry Pi Foundation Physical Computing course and measuring temperature using a DS18D20 sensor.
Raspberry Pi 3
This was bought in WH Smiths of all places (and I also bought the camera), the bonus was the I had a discount card! It has an Official Raspberry Pi case.
The case allows some access to the GPIO, but a number of HATS interfere with the support pillar visible in the photograph below.
This is a most travelled Raspberry Pi, it gets to go on holiday (I have an micro SD card with various podcasts and iPlayer programmes. It also allows me to back up photographs if required).
It normally has my development micro SD in place, with all the languages and tools I use.
The OctoCam
This is one of Pimoroni's projects in a box.
This uses the MotionEyeOS to function as a web cam.
Breakout Garden Pi
This is detailed here.
This is a Raspberry Pi Zero W with pre-soldered header in a Pibow Zero W case combined with a Pibow Breakout Base.
This normally runs as a temperature (plus humidity and pressure) display using a BME280 breakout board with the results displayed on the 1.12" screen.
Raspberry Pi Zero W
This Raspberry Pi Zero W is in an Official case and uses the top plate with the camera mount.
The camera was bought at the same time as the Raspberry Pi 3. Fitted in the Zero case provides a suitable housing. It is part of a project to scan ISBN numbers (and will be powered by a USB battery pack).
Pirate Audio headphones' amp
Another Pimoroni project.
This uses a Pi Zero with pre-soldered header and the board to produce a music server.
As I have a large number of CDs, it also incorporates python software to copy files from CDs.
Details of the project here.
Raspberry Pi 4
The Raspberry Pi 4 is in a Pimoroni Heat Sink case. It uses micro HDMI sockets and is powered via a USB C socket. It is currently due to take over the development Raspberry Pi slot.
