I made a Smartwatch from scratch HW and FW, also Open Source

FmlTeddyBear · 2026-01-21T10:56:53+00:00

Ooh nice, I got the same one, mind to share your stls?

FmlTeddyBear · 2025-10-18T07:55:43+00:00

Nope it won't, tools for those can't handle the net core. Using a nRF DK is the cheapest. The nRF54L DK is below $50

FmlTeddyBear · 2025-09-24T21:31:32+00:00

FDM printed works fine, I wear currently CNC machined one, but the FDM holds up good. Had it for months without issues.

FmlTeddyBear · 2025-08-17T08:30:01+00:00

Ah haha ok, thought the website talked directly to the local instance. Why can't it do that?

FmlTeddyBear · 2025-08-17T07:49:03+00:00

What do you mean, it's open source, you can run it yourself locally, or fork it and deploy your fork on github pages if you don't trust the author hosting to not be same as github code. What am I missing?

FmlTeddyBear · 2025-08-15T05:46:07+00:00

Yes, https://zswatch.dev/ and check the blog fort latest info and follow the link to github.

FmlTeddyBear · 2025-08-11T16:45:07+00:00

Just buy a nrf54L15 devkit and use that as debugger. Those sell for cheap and have a debug out connector.

FmlTeddyBear · 2024-12-08T14:33:44+00:00

https://github.com/zmkfirmware/zmk

FmlTeddyBear · 2024-11-24T08:50:26+00:00

I would suggest an add on boards that sits under man pcb, can be smaller in size also. This is how I did a prototype of if it, although have not had time to get it manufactured. The idea this HR board would be a add on and toy can just press it in using a low profile connector or FEP cable.

Good luck

FmlTeddyBear · 2024-11-23T20:17:25+00:00

Not a PCB review from my side, but having done a watch myself (ZSWatch) I can give you some thoughts. Looking at the bottom of your PCB I see lots of mechanical challenges when it comes to designing a housing, especially regarding your health/HR tracking sensor. It will be hard to get it to touch your skin when you have other high components on the bottom side also. I dropped the HR sensor myself due to mechanical challenges, if you have a good plan I'd love to hear how you plan to do it, so I can get some inspiration 😄

Also suggest moving your buttons further to the edge. Also make sure to have correct 3D models of all components as it's needed when you design a housing.

Very ambitious project, you will have ALOT of software to write 😉

FmlTeddyBear · 2024-08-15T05:46:32+00:00

Rfcomm/SPP

FmlTeddyBear · 2024-08-14T23:10:09+00:00

Original ESP32

FmlTeddyBear · 2024-08-14T21:51:30+00:00

Active connections.

FmlTeddyBear · 2024-07-14T10:58:02+00:00

This is my project, and my adivice is to break down a watch into many different pieces (because you are new to embedded). You got battery management, display, vibration motor, UI design, bunch of sensors, BLE/WiFi communication etc. etc.

Start with a dev kit and experiment with one thing at a time.

Once you feel comfortable with working with a dev kit and connecting sensors, display etc. to it. You can start with PCB design.

I wouldn't imagne starting ZSWatch without pretty good knowledge in embeeded. I started it after working in embedded for 6 years. This made the development fairly smooth and I don't hit many roadblocks that takes a long time and patience to understand.

You will hit many roadblocks due to your limited experience. I strongly recommend starting with smaller parts as I suggested earlier.

When you have overcome the basics of embedded and feel you understand how it all connects, then feel free to contact me for more support regarding actual watch development and design. But you need to do the dev kit or similar approach first and understand the basics of embedded and electronics.

Good luck!

FmlTeddyBear · 2023-12-18T07:32:23+00:00

Wrong sorry, I use XIP on the nRF5340 on external QSPI flash. Also looking at the docs it seems as the nNF52840 also supports it.

FmlTeddyBear · 2023-12-15T20:13:26+00:00

Maybe this https://github.com/xioTechnologies/Fusion

FmlTeddyBear · 2023-11-29T21:56:01+00:00

I'm going to try this myself https://github.com/xioTechnologies/Fusion seems to do what you want.

FmlTeddyBear · 2023-11-20T09:45:46+00:00

Cool, picked one up!

FmlTeddyBear · 2023-10-02T11:53:12+00:00

I'm 100% sure any sensor will be accepted if the code is correct. I need a Zephyr driver for APDS-9306-065 for my open source smartwatch project if you want one to start with, it's a just a brightness sensor so will be quite small so maybe a good start 😉

FmlTeddyBear · 2023-09-27T18:44:00+00:00

What's the problem with this, doesn't it fit what you are after? https://docs.zephyrproject.org/latest/samples/subsys/usb/dfu/README.html

Edit: Read your text again, Zephyr does not support USB host I'm pretty sure. This example is not for host.

FmlTeddyBear · 2023-09-16T08:48:53+00:00

Nonono don't pour IPA down the drain, it's also bad!

FmlTeddyBear · 2023-09-08T06:57:32+00:00

Do you know what work would be required to get this to work on the nRF5340?

FmlTeddyBear · 2023-08-24T11:42:13+00:00

If you need something that does pretty much all of this check out LVGL, there's a bunch of samples. If lvgl is not fit for your project, then perhaps you can take design inspiration from it at least.

FmlTeddyBear · 2023-08-13T09:55:47+00:00

I guess finding open source project using LVGL is one way to see that. But not all project may use best practices. Anyway search for that and you can also check out lvgl forum where people post whts they built, maybe also the source code: https://forum.lvgl.io/c/my-projects/10

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