One of our customers designing an embedded Linux system with specific audio needs had a use case where they had a sound card with more than one audio channel, and they needed to separate individual channels so that they can be used by different applications. This is a fairly common use case, we would like to share in this blog post how we achieved this, for both input and output audio channels.

Because I had been previously using my Pi as a headless server, I hadn’t installed a desktop environment. I wanted to add a lightweight heads-up display to the server, and I wanted a graphical application that could operate without X, the usual graphical system on Linux.
Writing such a lightweight application required understanding how to interact more directly with my new screen, the learnings from which I’ll share here. This article is a summary of multiple sources I pieced together.

Raspberry Pi controlling small LED array. Here is using a LED strip, but the chip may be the same to move the wished module:
https://amzn.eu/d/iVcOwJG

Example in Python of a TTS server for Catalan ONNX models

More into the side of how to ensure that the Raspberry Pi 5 behaves correctly having an Ollama service running. Memory, CPU, Temperature... very interesting to have control over the hardware behaviour, to peek on what's important to control.

Piper is a fantastic tool for providing very realistic sounding TTS while also being efficient and fast. There are some publicly available pre-trained models, but if you’re here, that means you want to create your own voice. This guide aims to walk you through the steps.

This GPIO Pinout is an interactive reference to the Raspberry Pi GPIO pins, and a guide to the Raspberry Pi's GPIO interfaces. Pinout also includes hundreds of pinouts for Raspberry Pi add-on boards, HATs and pHATs.

Ollama Model for Catalan

The tool/function calling equivalent for Ollama, looking quite similar to Gemini

The offline Model library for Python