In the case of Lukas Henkel's open-source smartwatch (OV Tech GmbH), something very special was created: an innovative, modular system that shows what is already possible today with pioneering PCB technology.

From concept to solution - together with Würth Elektronik
Lukas Henkel had a clear vision: to develop an open-source smartwatch based on his own system-in-package (SiP) and running on a Linux-based operating system. However, it took far more than just a good idea to make it a reality - it needed a technology partner who thinks along with us, helps develop and not only solves challenges, but loves them.
Together, we developed a complex, highly integrated PCB design based on the standardized ADVANCED.hdi stackup from Würth Elektronik. ADVANCED.hdi is our any-layer microvia technology - making it ideal for extremely compact and demanding applications such as wearables.

Technology that inspires - ADVANCED.hdi in detail
The advantages of our technology speak for themselves:

• Any-layer microvias with Ø 70 µm in the pad enable maximum packing density with excellent signal quality.
• Ultra-thin materials (e.g. ANSI GPY/42) allow ultra-compact designs - ideal for smartwatches.
• Structures from 75 µm, optionally even down to 50 µm, ensure maximum design freedom.
• The impedance-defined design is designed for high-speed applications such as Bluetooth or WLAN.
• High cycle stability and thermal stability (Tg ≥ 260 °C, Td ≥ 430 °C) offer reliable performance over the entire service life.

All of this was incorporated into the design of the open source smartwatch, which was implemented using Altium Designer. In the webinar hosted by Würth Elektronik, Lukas Henkel impressively demonstrated the entire development process: from the initial layouts and the placement of complex BGA components to the final assembly - including exciting insights into production, SiP design and even the planned market launch.

Cooperation that offers more
The fact that the project was a success was not only due to the technology, but above all to the partnership-based cooperation. Because at Würth Elektronik, we don't just see ourselves as a PCB supplier - we see ourselves as a solution provider. Our customers benefit from

• decades of experience in PCB design,
• a dedicated team that also takes unconventional approaches,
• state-of-the-art technologies and materials,
• and a strong network - such as here with OV Tech GmbH.

The response to the webinar was overwhelming: from Zeiss to Infineon and Volkswagen - numerous well-known companies and research institutes took part. The enthusiasm for the open, practical presentation was palpable. Feedback such as “a treasure trove of clever ideas” or “an amazing case study” confirms our claim to be more than just a supplier.

What's next?
Of course, we are already thinking ahead: together with the embedding department of Würth Elektronik and OV Tech, we are currently working on the next milestone - the embedding of a silicon-based planar coil, individually manufactured by Würth Elektronik eiSos. Here, too, the focus is on innovation - and, of course, close cooperation with our customers.

Conclusion
The open source smartwatch is more than just a technology project. It is an example of what is possible when people, ideas and technology work together as equals. And it impressively demonstrates that we find the right solution for every PCB requirement - reliable, future-proof and with enthusiasm for technology.

Stay tuned - we'll tell you more soon!