MSRP $19.99

Thunderboard Sense 2 Sensor-to-Cloud Advanced IoT Kit

The SLB004A is Not Recommended for New Design (NRND).
For new designs, we recommend you use the XG24-DK2601B (EFR32xG24 Dev Kit).

Thunderboard Sense 2 is a compact, feature-packed development platform. It provides the fastest path to develop and prototype IoT products such as battery-powered wireless sensor nodes. The development platform combines a broad range of sensors with the powerful multi-protocol EFR32 radio and a mobile app offering Bluetooth communication and cloud connectivity. Thunderboard Sense 2 also has an on-board J-Link debugger and is fully supported in Simplicity Studio.

MSRP $19.99


Wireless Gecko EFR32™

  • Wireless SoC with multi-protocol radio
  • ARM® Cortex® M4 core with 256 kB RAM and 1024 kB Flash
  • Low Energy Consumption
  • Flexible MCU peripheral interfaces

Kit Features

  • 2.4 GHz radio configuration with on-board antenna
  • Segger J-Link Integrated Debugger
  • USB CDC virtual serial port
  • 8 Mbit SPI ultra low power NOR flash for local storage

Sensors, I/O, and Misc. Control

  • Relative Humidity and Temperature Sensor Si7021
  • UV and Ambient Light Sensor Si1133 
  • Pressure Sensor BMP280
  • Indoor Air Quality and Gas Sensor CCS811
  • 6-axis Inertial Sensor ICM-20648
  • Digital Microphone ICS-43434
  • High brightness LEDs
  • Hall-effect Sensor Si7210

Mobile App

  • Use EFR Connect mobile app to connect, control, visualize sensor data and get insights into Bluetooth connectivity


Setting up your Thunderboard Sense 2 Kit


  • Thunderboard Sense 2
  • Coin cell battery or Micro-USB cable (not included)
  • Android or iOS mobile phone

Unleash the power of Thunderboard Sense. Let's start with unboxing, downloading the app, and exploring the sensors and basic features.

Step 1: Unbox Thunderboard Sense

  1. Purchase a Thunderboard Sense 2 if you don't already have one.
  2. Remove Thunderboard Sense from the box.
  3. Supply power to your Thunderboard Sense: place a battery in the coin cell battery holder on the bottom of the board, or plugin a micro-USB cable.

Note: The air quality sensor and RGB LEDs require external power. You will need to power the board via USB to test these.

Step 2: Use EFR Connect Mobile App

  1. Download EFR Connect mobile app
  2. Enable Bluetooth on your mobile phone

Launch the app and select the Demo tab.

Select on of the demos supported by the default Thunderboard firmware: Blinky, Motion or Environment.

Press the Reset button on the Thunderboard Sense to restart advertising.    

Sfter selecting the demo you will be prompted with a list of Thunderboard devices found wihthin range. Select your board to enter the demo screen.

Step 3: Try the Sensors

When you have successfully connected the Thunderboard Sense we are ready to test the board features.

  • Select the motion and calibrate the board and test the accelerometer and gyroscope.
  • Select "Environment" to test a number of environmental sensors
    • Humidity and Temperature: Blow or cover the temp. sensor with your finger
    • Light: Cover or shine a light on the board
    • UV: Measure UV index from the sun or a UV light
    • Sound: Talk, whistle, sing or clap to record audio levels
    • Pressure: Move the board from floor to ceiling to test the barometric pressure sensor
    • Magnetic Field and Door State: Move a magnet near the Hall Effect sensor and observe the effects
  • Select "Blinky" to test a buttons and LEDs.
    • Switches: Press the two push buttons on the board    
    • LEDs: The app switches will turn on/off the small LEDs on the board
    • RGB LEDs: Control the color and brightness of the RGB LEDs  

Developing with your Thunderboard Sense 2 Kit


  • Thunderboard Sense
  • Micro-USB cable
  • Simplicity Studio
  • Bluetooth SDK

Step 4: Download and Install Simplicity Studio Version 5

Get up and running quickly with precompiled demos, application notes, and examples. Use advanced tools including energy profiling to optimize your MCU application. Choose your software package below.

Step 5: Plug in Your Kit and Use Simplicity Studio to Install the desired SDKs

After plugging in your kit, launch Simplicity Studio and Open Package Manager in the left upper corner (downward arrow under the menu bar). Select the desired stacks and download them. Visit the package manager regularly for updates.

  • Bluetooth SDK
  • Bluetooth Mesh ADK and SDK
  • EmberZNet (Zigbee) SDK
  • Flex SDK
  • OpenThread SDK

Step 6: Read the Quick Start Guides

Download the following Quick Start Guides with more detailed instructions on how to get started.

  • QSG106: Getting Started with EmberZNet PRO
  • QSG148: Getting Started with the Silicon Labs Bluetooth Mesh Lighting Demonstration
  • QSG168: Proprietary Flex SDK v3.x Quick Start Guide
  • QSG169: Bluetooth SDK v3.x Quick Start Guide
  • QSG170: Silicon Labs OpenThread Quick-Start Guide


You can start developing Matter (formerly project CHIP) solutions using the Thunderboard Sense 2 Kit

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