Name: CoffeeCaller – a Fully Open Source Product Development Example - Andreas Kurz, TiaC Systems & Stefan Kraus, Independent
Start: 2025-08-26T11:00:00+0200
End: 2025-08-26T11:40:00+0200

25-27, August 2025
Amsterdam, Netherlands
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Note: The schedule is subject to change.

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Tuesday August 26, 2025 11:00 - 11:40 CEST

D202

CoffeeCaller is an embedded device designed to coordinate coffee breaks between colleagues across an entire building. What began as a fun, free-time idea turned into an exploration of different product development approaches within the constraints of hobby time and budget. The goal wasn’t just to build something functional, but to try out techniques that could scale—from quick iterations to structured hardware-software integration.

We will show our journey from the idea to the finished project, that started with a simple proof of concept to validate the approach, followed by parallel development of hardware and software: While one created a custom hardware design in KiCad, the other development the actual application with Zephyr RTOS at the same time. We describe how we created the device tree as a bridge between both, keeping things modular and maintainable. We first implemented BLE Mesh for communication, later transitioning to openthread for broader connectivity. The entire project, including hardware and firmware, is open source.

Speakers

Andreas Kurz

Software Engineer, TiaC Systems

Software Engineer for the day job, Electrical Engineer in the free-time. Doing microcontroller projects as a hobby.

Stefan Kraus

Senior Software Engineer, Independent

With nearly 10 years of experience in Software Development, I am especially interested in ensuring reliability and quality in software products. Right now, especially working in the medical and cyber security field

Tuesday August 26, 2025 11:00 - 11:40 CEST
D202

Zephyr Developer Summit

Audience Experience Level Intermediate

Open Source Summit Europe 2025

Andreas Kurz

Stefan Kraus

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