UART-Smartwatch

Android App, Firmware and Circuit for a DIY Smartwatch working with Bluetooth Low Energy (4.x)

Features:

• Press Button 1.5 s : sync the time between watch and phone. Show date and notifications as scrolling chars.
• Press Button 0.5 s : show the time calculated by the watch. Show the battery level and an analog clock
• small analog clock
• digital clock
• Battery Level
• about 18 hours with LiPo 3.7V (170mA)
• some emoticons works
• transmit more than 20 bytes

The DIY smartwatch shows a calculated time without a connection to your phone. This time is a bit faster to pretent problems. It is about 1 second in 6 hours.

Support me:

Get a PDF (german) about my UART Smartwatch Project from here: or as Website

App

UART-Smartwatch APK or get the App from f-Droid

Location Access

It is strange, but Bluetooth Low Energy with Android 6 needs Location access to search for BLE devices.

Notification Access

This App needs access to all notifications. You have to add these access in the preferences of your Smartphone:

Firmware / Smartwatch

UART-Smartwatch / Arduino IDE

Circuit

Devices:

• Adafruit Bluefruit LE UART Friend
• Micro OLED Breakout
• Pro Trinket 3V
• LiPo 3,7V (170mAh)

Startlogo

In stuff/ is a small c program to make you own Smartwatch startup logo:

• make a 64x48 s/w Image
• store it as xbm file (e.g. with Gimp) without x10 option
• copy the content into the code
• compile and execute the code
• copy the printed output
• open: Arduino/libraries/Micro_OLED_Breakout/src/SFE_MicroOLED.cpp
• paste it into / replace the hex-chars of static uint8_t screenmemory [] = {...}
• rebuild the UART-Smartwatch Firmware with Arduino IDE

to do

• make the aggressive message getting (rev 3.1) as an option, because the downcounting (how many unread messages) does not work with that
• better "down and upcounting" to fix the above problem

Sign Of Gratitude

Thank you to NORDIC SEMICONDUCTOR for the OpenSource App like nRF UART v2 to make it easy to use their products!!