SLTB004A SILABS | Alldatasheet

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Technical content

UG313: Thunderboard Sense 2 Bluetooth Low Energy Demo User's Guide The Thunderboard™ Sense 2 Bluetooth® Low Energy Demo is a complete sensor-to-cloud solution for the Thunderboard Sense 2 kit and accompanying iOS/Android application. The demo collects and processes sensor data from the Thunderboard Sense 2, and gives immediate graphical feedback to the user through the Thunderboard iOS/Android application. Cloud connection enables real-time graphs and past sessions of the sensor data to be viewed on other devices through the web client. The demo is open source and provides a great demonstration and evaluation tool for adding Bluetooth Low Ener- gy connectivity to a sensor or actuator project. THUNDERBOARD SENSE 2 HARDWARE

  • Orderable pn: SLTB004A
  • EFR32 Wireless System-on-Chip Hall effect sensor
  • Relative humidity and temperature sensor
  • UV index and ambient light sensor
  • Indoor air quality gas sensor
  • 6-axis inertial sensor
  • Barometric pressure sensor
  • MEMS microphone
  • Four high brightness RGB LEDs BLUETOOTH LOW ENERGY DEMO FIRMWARE
  • Silicon Labs Bluetooth Low Energy protocol stack
  • Board Support Package including board peripheral drivers Bluetooth LE services supporting hardware peripherals
  • Source code available THUNDERBOARD MOBILE APP
  • Bluetooth Low Energy enabled mobile application
  • iOS/Android platform support Cloud connected
  • Source code available THUNDERCLOUD
  • Web client based on Google Firebase
  • V isualizes real-time sensor data and past sessions
  • Source code available silabs.com | Building a more connected world. Rev. 1.00
  1. Getting Started This section describes how to quickly get started with the Thunderboard Sense 2 Bluetooth Low Energy Demo. Before proceeding, it is recommended to download Simplicity Studio and check for kit firmware updates. 1. Install the Thunderboard app from iOS App Store or Google Play Store Links to the mobile app can be found here: http://www.silabs.com/start-sense. 2. Launch the app If prompted, allow the app to turn on Bluetooth. 3. Supply power to the Thunderboard Sense 2 Connect a USB cable to the kit or insert a CR2032 coin cell battery. The Thunderboard Sense 2 now starts to advertise over Bluetooth for a duration of 30 seconds. 4. Connect the Thunderboard Sense 2 to the Thunderboard app Click the device that shows up on the start-up screen on the Thunderboard app to connect the devices. If more than 30 seconds has elapsed since power was applied, the left button can be pushed to put the Thunderboard Sense 2 back in advertisement mode for another 30 seconds. A green LED blinks on the Thunderboard Sense 2 when the board is in advertisement mode and ready to be paired with the app. The figure below shows the firmware state diagram running on the kit and how the start-up screen on the app looks like when a Thunderboard Sense 2 is ready to be paired. Reset Advertise ConnectSleep 30 second timeout Left button pushed Power-up/ reset button The kit appears on the app Figure 2.1. Kit Firmware State Diagram and App Start-up Screen 5. Explore the app Click on the screen to navigate through the app, watch live sensor data and control the LEDs on the Thunderboard Sense 2. Stream- ing data to the cloud is also possible. The two figures below show screenshots from the app running on an Android phone. UG313: Thunderboard Sense 2 Bluetooth Low Energy Demo User's Guide Getting Started silabs.com | Building a more connected world. Rev. 1.00 | 3
  1. Additional Information

3.1 Power Supply

2 estimates the source impedance of its power source and transmits this information to the app. If the power source is classified as a CR2032 coin cell, the following features will be disabled in order to conserve power and avoid brown-out situa- tions:

  • RGB LEDs
  • CCS811 indoor air quality sensor The remaining battery percentage of the Thunderboard Sense 2 is also estimated and shown on the app if a battery source is powering the board. Note that some external batteries, especially if they are nearly discharges, may be classified as CR2032 coin cells even though they are not.

3.2 Motion Calibration

Calibration of the gyroscope is performed when launching the motion view, and the orientation of the board will be reset to a predeter- mined position. In motion view, recalibrating the gyroscope can be performed anytime by clicking the calibrate button. Remember to place the board on a level surface and orient the board in the same direction as the image of the board shown in the app. The board needs to be held steady while calibration is in progress.

3.3 Sensor Data Refresh Rate

The sensor read-out rate on the board and app directly influences the refresh rate of the sensor data shown on the screen. The envi- ronmental sensor data are, for instance, read at a fairly slow rate in order to conserve power. The refresh rate of the sensor data may differ depending on the firmware and app revision.

3.4 Gas Sensor Initialization

The indoor air quality sensor reporting carbon dioxide and volatile organic compounds to the Thunderboard app requires a start-up peri- od before it transmits data to the app. The app will therefore show a value of 0 ppm and 0 ppb, respectively, during the start-up period. UG313: Thunderboard Sense 2 Bluetooth Low Energy Demo User's Guide Additional Information silabs.com | Building a more connected world. Rev. 1.00 | 5

  1. Document Revision History Revision 1.00 2017-09-27 Initial document version. UG313: Thunderboard Sense 2 Bluetooth Low Energy Demo User's Guide Document Revision History silabs.com | Building a more connected world. Rev. 1.00 | 6

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