Schmartwatch

Description

I love my Pebble smart watch. The fact that it is always readable is the absolute highlight for me. So I designed this watch to be always readable as well. It comes with an 150x150 pixel 1.5" e-ink display, Nordic nRF52 MCU, buzzer, display light and 4 buttons. It is driven by an CR2032 Battery and the best thing is, the wrist band is part of the PCB!

Components

1 × Flex PCB

1 × ISP1507-AX-RS BLE enabled MCU

1 × GDEW0154Z17 e-ink display

1 × M41T62LC6F Clock and Timer ICs / Real-Time Clocks

1 × LSM303AGRTR IMU

Project Logs

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Ordered PCB and parts
Platinenmacher • 03/29/2019 at 07:34 • 0 comments

I just finished ordering the parts and PCBs for 10 watches. Price breakdown is:

* 25 PCBs for 180$ (+ additional taxes) provided by PCBgogo

* Parts for 10 watches + surplus because of MOQ 350€ provided by Mouser

* additional 5 Displays 36$ provided by Good Display

--------

Material price per watch ~ 60€

Now I wait for delivery. And will build up one sample. If that works well I will build up all ten of them.

After building up all of the ten watches I will be able to supply some of them to people interested. Price point will discussed when it is time to talk about selling. As you can see from the costs a price around 100€ is very reasonable and will mostly cover the cost of this production and previous experiments.
Time for Review
Platinenmacher • 02/20/2019 at 07:39 • 10 comments

It is time to show the world my progress with this project. I uploaded it to github so you all can have a look and tell me what is wrong with it.

https://github.com/DasBasti/SchmartWatch_Hardware

Next to the KiCad project I also added PDF files of schematic and layout.

Please have a look at it and tell me your opinion before I put 1000$ into ordering a couple.
Here are a few infroations about the design.
The Board outline is designed to be fabricated as a flex PCB. There are a few stiffner areas where there should be a plastic plate supporting the flex board.
The watch is powered by a 3V coin cell that sits in the holder in the middle of the board.
From the cell the 3V are going to the RTC and the writst band brace. If the watch is closed around the wrist it closes the circuit and powers up the DCDC boost converter U2. This generates 3.3V for the whole system.
New Hardware Revision
Platinenmacher • 11/18/2018 at 12:01 • 0 comments
I ordered a new hardware revision for the Schmartwatch board. This will come with two more features:
- Piezo buzzer
- Light for the e-paper display
Blog article (German): https://www.kurzschluss-blog.de/2018/11/schmartwatch-11-neue-hardware.html
Updating the e-ink display
Platinenmacher • 10/17/2018 at 18:45 • 0 comments

This video shows the display updating a full image
The display can also update a partial area

View all 4 project logs

Discussions

x-labz wrote 03/21/2019 at 08:18

Amazing work! Keep on working!!! :-)

Are you sure? yes | no

Platinenmacher wrote 03/29/2019 at 08:36

Thank you

Are you sure? yes | no

Erland Lewin wrote 03/20/2019 at 14:23

Great project!

I started on a project similar to this in 2013 (wow, how time files). I put up a presentation for a meetup group I did at the time on Slideshare: https://www.slideshare.net/ErlandLewin/yet-another-smartwatch
I used a Sharp Memory LCD instead of proper E-ink display (but they are quite similar in almost not drawing any current with a static image). I also planned for a small LiPo battery with a USB connector in the watch to charge it. And I had a vibration motor for buzzing (but not audible alarm).

I wanted a touchscreen for interacting with the watch, or three touch sensitive pads below the display, but had issues with the IC I used for capacitive touch detection.

Is it difficult to do the impedance calculations for the nRF BLE antenna circuit with a flex PCB? Are you using a chip antenna or a PCB trace? Is the eInk display flexible? That would be really sweet, but I'm guessing it's not.

I'll be following your project with interest!

Are you sure? yes | no

Platinenmacher wrote 03/29/2019 at 08:36

Hi, nice project you had goning there. I like the sharp mmeory lcd of my pebble smartwatch a lot. But i wanted to do something with eink.

The BLE antenna is inside the radio module so not on the flex pcb. The PCB has a cutout in the copper pour for this though.

Are you sure? yes | no

fabian wrote 03/18/2019 at 22:21

is possible to write my own program on it?
assembler?

Are you sure? yes | no

Platinenmacher wrote 03/29/2019 at 08:31

It is possible to add your own program to it using C

Are you sure? yes | no

bobricius wrote 03/07/2019 at 08:11

Beautiful watchface !!!

Are you sure? yes | no

Platinenmacher wrote 03/29/2019 at 08:31

Thank you

Are you sure? yes | no

Jeffrey wrote 02/20/2019 at 11:07

Man, I really dig that watchface design! I'd love to have it on my Pebble

Great work on the watch too, it looks amazing

Are you sure? yes | no

Platinenmacher wrote 03/29/2019 at 08:36

Can you still develop for the pebble? If it is not to hard i might port it there. I still have my pibble time at hand.

Are you sure? yes | no

deʃhipu wrote 10/18/2018 at 13:32

I wonder whether you saw this project: https://twitter.com/arturo182/status/1050145301238038528 — it could give you some ideas!

Are you sure? yes | no

Platinenmacher wrote 10/18/2018 at 20:08

I have not. Thank you very interesting

Are you sure? yes | no

Schmartwatch

Description

Components

Project Logs

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Ordered PCB and parts

Time for Review

New Hardware Revision

Updating the e-ink display

Discussions

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