WolfganP
commented
4 years ago An additional watch based on the nRF52840: Umidigi Uwatch 3 https://www.umidigi.com/page-umidigi_uwatch3_specification.html
Multiple vendors at https://www.aliexpress.com/w/wholesale-umidigi-watch-3.html?CatId=200010206 for USD30+
Dimensions
Diameter: 41.6mm
Thickness: 11.6mm
Strap Width:19mm
Mechanical
Waterproof 5ATM
Screen size 1.3"
Screen type TFT-LCD，Square color screen
Screen cover High hardness glass cover
Strap material TPU
Buckle TPU
Tongue buckle 316L stainless steel powder metallurgy |
Hardware
MCU Nordic nRF52840
IMU (acceleration + gyroscope) STK8321
PPG heart rate sensor HX3600
Motor 0827 flat motor
Screen Resolution 240*240
Flash 64Mb
Bluetooth Bluetooth5.0
Bluetooth antenna module FPC
Power
Operating Voltage 3.8V
Battery capacity 210mAh
Battery type Lithium polymer battery
Charging method Socket charging
Charging time ≤ 2.5 hours
APP OS
iOS iOS 8.0 and above
Android Android 4.4 and above
Function
Multi-language support 6 languages(English, German, Japanese, Chinese，Russian，Korean) Basic functions Clock, date display (12/24 hour system, default 12 hour system) Data storage (30-day data of overview, 7-day data in details)
OTA upgrade (Upgrade directly via the Bluetooth connection app) Daily activity monitoring Heart rate (24-hour real-time heart rate monitoring)
Sleep (Record normal sleep (excluding short break): falling sleep time, wake up time, total sleep time.)
Steps (Monitor the number of steps per minute and record it every 10 minutes)
Calorie (Monitor calories per minute and record it every 10 minutes)
Distance (Monitor the distance per minute and record it every 10 minutes)
Active time (Monitoring the activities duration ( including walking, running, cycling))
Sports functions
Outdoors running (Exercise time, energy consumption, heart rate, pace, speed, steps, distance)
Indoor running (Exercise time, energy consumption, heart rate, pace, speed, steps, distance)
Outdoor riding (Exercise time, energy consumption, heart rate, [ App launches the movement display: pace, speed, distance])
Indoor bicycle (Exercise time, energy expenditure, heart rate)
Outdoors running ( Exercise time, energy consumption, heart rate, pace, speed, steps, distance) Hiking (Exercise time, energy consumption, heart rate, pace, speed, steps, distance)
HIIT (Exercise time, energy expenditure, heart rate)
Yoga ( Exercise time, energy expenditure, heart rate )
Autonomous measurement
Heart rate measurement (User self-measurement, single heart rate monitoring)
Notifications
Calling Notification (Incoming call received, an alert is displayed; You can hung it up by watch.)
Calendar reminder (The phone receives a calendar push and display it to watch.)
SMS notification (The phone receives SMS message push anddisplay it to watch.)
App notification (Push notifications from other apps in watch by your choice)
Alarm reminder (This reminder appears when the user is sedentary more than an hour, reminding the user to stand up and do some exercise)
Target reaching reminder (Show this alert when the sport goal is reached)
Low battery reminder (Show this alert when the battery power is low)
Ultra low battery reminder (Shows this alert when battery power is extremely low)
Binding notification (When the APP is bound to the watch, a confirmation binding notification is displayed .)
Other functions
Stopwatch (The stopwatch is accurate to the nearest second (eg 59:59.99))
Timer (The timer can be set up to 23 hours, 59 minutes and 59 seconds.)
Reset function (Clear device data and restore factory defaults)
Firmware information (View device related information (firmware version, Bluetooth address, etc.))
Restart (Restart bracelet)
Shut down (When the wristband device enters the shutdown state, you can press the physical button for a long time.)
Gesture
Lift the wrist (Lift the wrist to automatically brighten)
Lay down (Put down the automatic shut down screen)
Environmental
Operating temperature -20℃ to 40℃
Charging temperature 0℃ to 40℃
Working humidity 10%-90%RH（Non-condensing）
Storage temperature -20℃ to 50℃
Storage humidity 5%-90%RH(Non-condensing)
Something I posted at Reddit r/pebble that may we worthy in here as documentation
Lurking around for a replacement smartwatch that I may control :-) I read https://rebble.io/2019/07/29/the-shiny-rebble-future.html with real interest, particularly the work on the Nordic nRF52840 SoC (described at https://github.com/jwise/aWatch2-hw/blob/master/designspec.txt)
So looking if anyone developed any commercial smartwatch on the same platform already, I found this post https://www.nordicsemi.com/News/2019/07/DO-Technology-ID205-wearable-employs-nRF52840-SoC-to-deliver-power-and-wireless-connectivity and obviously I jumped immediately to search for availability and additional info:
Product announce: https://www.facebook.com/idosmartbracelet/photos/a.1664910450403822/2332240317004162/?type=1&theater
User Manual: https://usermanual.wiki/DO-Intelligent-Technology/226
FCC ID (alt user manual avail): https://fccid.io/2AR5EID205
Work with alt firmware on nordic SoCs, info that may be useful: http://forum.espruino.com/conversations/280747/?offset=150#14729873 (seems to indicate that nRF52840 SDK requires signed firmware images)
Way to get the ID205 watch: https://www.aliexpress.com/wholesale?catId=200010206&initiative_id=AS_20191028111827&SearchText=id205 (many sellers for ~USD 25)
If I found anything else on this platform, I'll certainly add in here.