community case designs that are slimmer than
the ones that I have made so far. If you’d like to
know more about the project or would like to
build your own from scratch (for $100 or more)
you can head over to open-smartwatch.github.
io. For questions, join my Discord server at
discord.gg/SBtSmbZNqY.
The Open-SmartWatch OS currently has
analog/digital/binary watch faces, a stopwatch,
a web-based configuration tool to modify color
themes and general settings, manual time
setting app, step counter including a statistics
widget showing the last 7 days, and a bubble
level. There are games made by the community
(Snake, Blockout). You can program the watch
with your own apps using Visual Studio Code +
PlatformIO using the Arduino framework.And
when the internet goes down, your Open-
SmartWatch will still work just fine.
Another idea I'm working on is to enable
watches to exchange firmware updates directly
with each other, without internet. If you meet
someone with a newer Open-SmartWatch OS,
you’ll be able to share it with the push of a button.
Next Steps
Currently I’m working on the Mono as well as
the next Light Edition, fine tuning the hardware
components and rewriting the OS from scratch.
Due to the global chip shortage I haven’t been
able to acquire all the components I’d like to use,
so I’m using the time to select optimal ones. I
expect to see further improvements in battery
life, functionality, and display colors.
Until then I’ve also picked up a new hobby:
writing sci-fi novels! My first book, Mars Will
Divide Us, is available at amazon.com//dp/
B098BN9KBF. Maybe this can shorten your
waiting time until I finish the next watch models,
and give you a chance to support my projects.
57
make.co
EspWatch
Open-SmartWatch
Light V3
Open-SmartWatch
GPS
Open-SmartWatch
Mono
Open-SmartWatch
Light V4
DISPLAY 152×152 e-paper 240×240 TFT 240×240 TFT 240×240 SMD 240×240 TFT
MICROCONTROLLER ESP8285 ESP32 Pico D4
ESP32 Pico D4
ESP32 Pico V3-02 ESP32 Pico D4
FLASH 1MB 4MB 4MB 8MB 4MB
RAM 80kB 320kB 320kB 320kB + 2MB 320kB + 2MB
SD N/A N/A MicroSD N/A opt. MicroSD
RADIO Wi-Fi Wi-Fi + BT Wi-Fi + BT Wi-Fi + BT Wi-Fi + BT
ACCELEROMETER N/A BMA400 BMA400
B
MA400 BMA400
PRESSURE BME280 N/A N/A MS5847 BME280
TEMPERATURE BME280 N/A N/A MS5847 BME280
MAGNETOMETER N/A N/A N/A QMC5883L QMC5883L
THICKNESS 15mm 16mm/14mm 17mm 10mm ?
INPUT
Reset + 1 button
Reset + 3 buttons
Reset + 3 buttons 4 touch buttons Reset + 3 buttons
BATTERY MONITOR N/A Analog (V) Analog (V) MAX17034 (%) MAX17034 (%)
BATTERY LIFE
(OFFLINE)
<1 Week 1 Week 1 Week 1 Month ?
WATERPROOF No No / partial No Yes? ?
STATUS
Prototype
Available
Discontinued In development In development
Comparisons
M82_052-57_SS_SmartWatch_F1.indd 57M82_052-57_SS_SmartWatch_F1.indd 57 7/11/22 2:21 PM7/11/22 2:21 PM
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