weOS

System for wristwatches based on Arduino

This repository contains nothing more than children's creativity 🙂. The development was carried out in 2015-2017 and its goal was a cheap alternative to electronic wristwatches.

The project was brought to a working prototype, but without a body, since it was not possible to obtain a satisfactory printing result.

Later, more advanced components were purchased for the project, and it was decided to refactor the existing source code, but due to lack of time, the project remained at the idea stage.

Prototyping photos available.

Branches

• clock-face — pre-development of watch dial.
• debug — various debugging scripts created during the development process.
• v2 — complete rethink of the code base.
• menu — menu library development.

Device information

Technical specification

v0 — based on Arduino Uno

Component	Model name
CPU	Atmega328P
Screen	PCD8544 (1.6" 84*48 B/W LCD)

v1 — based on Arduino Uno

Component	Model name
CPU	Atmega328P
Clock	DS1302
Screen	ILI9163C (1.44" 128*128px Color LCD)
Bluetooth	HC-05
Vibration	similar to Nokia 3310
Battery	260mAh

v2 — based on Teensy 3.2

Component	Model name
CPU	MK20DX256VLH7 (ARM Cortex-M4 at 72 MHz)
Screen	SSD1327 (1.5" 128*128px Color OLED)
Bluetooth	JDY-08 BLE
Accelerometer	GY-61
Vibration	similar to iPhone 4
Battery	260mAh (planned 300-320mAh)

Electricity consumption information

Consumer	3.7V	5V
Atmega328P-PU	7.2mA	N/A
Screen (ILI9163C)	0.7mA	N/A
Screen backlight (50% (125))	5.1mA	N/A
Vibration (50% (125))	N/A	N/A
Bluetooth	N/A	N/A
Bluetooth (connected to device)	N/A	N/A

Screen (system?) power consumption depending on brightness

Brightness (%)	Consumption (mAh)	Battery life (h)
0	7.50	N/A
5	7.99	N/A
10	8.35	N/A
15	8.65	N/A
20	9.01	N/A
25	9.33	N/A
30	9.69	N/A
35	10.00	N/A
40	10.37	N/A
45	10.68	N/A
50	11.04	N/A
55	11.36	N/A
60	11.74	N/A
65	12.07	N/A
70	12.40	N/A
75	12.73	N/A
80	13.12	N/A
85	13.45	N/A
90	13.82	N/A
95	14.16	N/A
100	14.51	N/A
Avg	11.05	N/A

Used libraries

• Adafruit_GFX
• Adafruit_PCD8544
• TFT_ILI9163C ❤️
• MsTimer2
• MemoryFree
• DS1302
• HC05
• SSD_13XX

Documents

• Статистика.xlsx — electricity consumption information.
• Яркость.docx — measurements of electricity consumption depending on screen brightness.
• hm-11_bluetooth40_en.pdf — documentation for bluetooth modules HM series.
• ordered.csv — list of ordered parts.

Schematic & Layout Design

I couldn't find the files, I think they were lost 😢. All that remains is a photo of the developed printed circuit board. As far as I know, it was developed in DipTrace or Sprint Layout.

3D Model

The 3D models was developed using the Компас-3D.

wclock_body.m3d, view on Sketchfab wclock_back_cover.m3d, view on Sketchfab wclock_buttons.m3d, view on Sketchfab

Special thanks

• To my father for his support and help.
• For sumotoy for really cool libraries for displays.