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Low power Wearables

TI Tiva Based Watch 

RoweBots first off the shelf solution for wearables is based on the TI Launchpad series of development boards and the Unison OS based WearableOS to implement a low power wearable watch. It offers the following features:

  • ● Full color display 240 x 240
  • ● BLE connection to an Android phone
  • ● Command interpreter
  • ● LED controls
  • ● Time updates
  • ● Weather updates
  • ● Control of watch from phone
  • ● Events from watch to phone
  • ● Accelerometer data display on Android
  • ● Optional fuel gauge and battery
  • ● Optional sensor pack for environmental and vital signs monitoring

The WearableOS software is available along with off the shelf hardware to evaluate this solution. The hardware includes:

  • ● TM4C 123 launchpad
  • ● TM4C 129 launchpad
  • ● Display module available from RoweBots
  • ● Optional TI Sensor module
  • ● Optional TI Fuel gauge

The off the shelf WearableOS software includes the following components:

  • ● Simple graphics for time, weather and other display
  • ● Command interpreter for LED and other watch control
  • ● Android application control program with simple button updates
  • ● Android accelerometer display
  • ● Code Composer Studio IDE compatible Unison WearableOS modules
  • ● Subset of Unison WearableOS modules for watch implementation
    • - Core kernel, I/O model, serial I/O (debugging), file system
    • - BT Classic and BLE software for HCI connection
    • - BLE command processing and file transfer via BLE app (playstore)
    • - Watch display graphics with update capabilities
    • - Timer and watch setup software
    • - Accelerometer control software and data transfer over BLE
    • - MQTT 
    • - Android MQTT application (playstore)
    • - sensor drivers and LED drivers with MQTT control software

The demo currently consists of two separate assemblies.  The first assembly shows the display, connectivity, wireless Android phone display updates and accelerometer data.   The second assembly is used due to launchpad limitations.  It has the features for the sensor pack (temperature, humidity, altitude, pressure, accelerometer, ...),  a wireline ethernet connection, a fuel gauge and battery,  and cloud connectivity using the 129 launchpad.   MQTT support and Android phone operation is also implemented for the 129 launchpad.

This low power wearables example is an ideal means to get started developing wearables.   First, you can quickly assemble the features with an off the shelf set of hardware which is open source with all gerbers and schematics.  Next you can develop your own watch application complete with advanced accelerometer, temperature and other sensors.  Then, taking the known hardware components, you can layout your own watch and design a case, and you will have a fully functional smart watch.  The only things that are not free are the hardware components ($100 approximately) and the Code Composer Studio IDE, which may also be free depending on the application size.  The Unison OS and all the software for development is free for prototyping.

Get your low power wearables development started today with the TI Tiva based watch reference design.




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RoweBots was founded in May 1987 by a group of Univer­sity researchers. From the outset, RoweBots had its roots in real-time multiprocessor software and has broadened into an embedded signal processing systems company today.

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