Raspberry Pi has a huge collection of SBCs, each surpassing the older models. The Raspberry Pi 5 is the newest kid on the block, while the Pi Zero 2W is the latest in the Zero lineup. There's a high chance that if you love SBCs and building DIY projects, you might have collected several models. Some of them still have a couple or a few more years of official support, but they might not work great with the latest OS and self-hosted tools.

Their hardware might be a bottleneck for running the latest or greatest tools, resulting in neglect. However, you can breathe life into the Pi by repurposing it. I have built several Raspberry Pi projects that can help you give a new role to your outdated Pi. Moreover, these projects do not stress the older Pi models and work without any problems. Let's look at five ways you can make something meaningful with an old Pi.

Remote Downloading device

Free up your main PC

A Raspberry Pi cannot replace your computer, but that doesn't mean it cannot accomplish smaller tasks. The Raspberry Pi 5 can run Windows 11 and even double up as a PC, but the older models like Pi Zero and Zero 2W, Pi 2 and older, are unfit for such roles. I have a Pi Zero 2W that's exclusively built to act as a remote downloading device whenever I need it.

I run the 32-bit version of Raspberry Pi OS with JDownloader 2, which acts as my downloading tool. RealVNC server is my remote access tool, and I use it to paste download links and monitor downloads from other devices. Since the Pi OS runs on an SD card, I use an old external hard disk to store all the files. Most of the downloads include newly released Windows 11 Insider and niche Linux distro ISOs, among other things, and the Pi runs perfectly.

Since it's a low-resource SBC, it doesn't need too much power to work. I don't even have to worry about outages, as I keep it connected to a power bank. My router is also connected to a battery that ensures a seamless connection, even when electricity is down.

While long power outages rarely occur, even a few-second power cut and reboot can result in a re-download. So, using a battery backup keeps me safe from that problem, and the Pi can last tens of hours on a power bank.

Reviving an old Hi-Fi speaker system

MoOde Audio OS to the rescue

Most models of Raspberry Pi don't have an audio port. So, you have to rely on Bluetooth to connect it to a speaker. But I have an old Hi-Fi Sony speaker with 7.1 channel output that predates the Bluetooth era. So, the auxiliary port cable is the only means to connect and play audio on it.

I'm not a fan of keeping my phone connected to the speaker to play music, and I used MoOde audio OS to give it a new life. The operating system acts as a music interface and lets you stream audio via the Pi to the speaker. So, the Pi acts as an intermediary, storing all your music and audio, and then directs the speaker to play it. You can access the web interface to control everything.

But how does the Pi play music via the speaker without an audio port? I solved this problem by using an audio DAC that I use with my Samsung S21 FE smartphone. The DAC connects to the Pi Zero 2W via the micro USB port, and then I can connect it to the other end of the auxiliary cable running from the speaker system.

This simple setup lets me play music from any device, including my smartphone, without tinkering with hardware modifications in the speaker.

Local server for lightweight self-hosted tools

Multiple useful options

The older Pi models cannot run heavy self-hosted solutions like NextCloud or Home Assistant due to an underpowered SoC and limited memory. But there's no reason to ditch your old Pi because there are several lightweight yet useful services available.

I've always hated the idea of uploading documents or files to the web for simple tasks like conversion, compression, or editing. Omni Tools is my latest favorite that runs nicely on a Pi Zero 2W and tackles all my PDF, image, and video needs. It's a local solution, but I've deployed Tailscale on the Pi, which allows me to access even from another network while I'm away.

A few more tools come to mind when I think about less resource-intensive models. You can deploy Vaultwarden and stop paying for a password manager. The key to using Vaultwarden is a secure network and creating regular backups to an external USB drive. Otherwise, you always have a chance of SD card corruption and mishaps.

Pi-hole is also a solution you can try that is immensely useful. I'm tired of ad blockers set up on every device, and building a home-wide solution like Pi-hole is a much more useful method.

Retro gaming setup

Relive your childhood

Custom Raspberry Pi operating systems like RetroPie can convert your Pi into a gaming device. After flashing the OS, you can connect a gaming controller and upload the game files to the Pi. All the configuration happens via the controller, and you get a console-like interface that's easy to confirm with the controller.

The best part is that you can build something purposeful with old components like a TFT monitor and a Pi. While it cannot emulate the PlayStation games to the fullest, you can use it to relive the 80s and 90s era. My niece loves playing those simple games, and the Pi has a new role to fulfill now.

Clustering the Pi’s

Docker Swarm or Kubernetes

Another great use for idle hardware is building a cluster out of them. You can combine different hardware, including a bunch of ARM-based SBCs, and use them as a cluster to add more resources to your home lab. It’s not simple, but once you get to it, a fault-tolerant setup is ready for you.

I previously experimented with Docker Swarm and combined different SBCs to create master and server nodes. You have to figure out shared storage as well, and I used GlusterFS as a solution.

Old but useful

Raspberry Pi models might be old, but they can still fit in multiple roles. I appreciate that the Raspberry Pi Foundation still supports most models, which is good news for users with multiple devices they acquired in the last decade. I personally run Omni Tools on one Pi and use one for Hi-Fi speakers on another one, but you have many more choices to explore.