Silicon Labs’ Thunderboard Sense kit packages six onboard sensors, multiprotocol wireless for IoT developers

Silicon Labs has released Thunderboard Sense, a sensor-to-cloud development kit based on the EFR32 Mighty Gecko multiprotocol wireless system on chip (SoC) with a 2.4 GHz antenna that supports Bluetooth Low Energy (BLE), ZigBee, Thread, and proprietary protocols. The 30 mm x 45 mm Thunderboard Sense includes relative humidity and temperature and UV index and ambient light sensors from Silicon Labs (The Si7021 and Si1133, respectively), a Bosch Sensortec BMP280 barometric pressure sensor, Cambridge CCS811 indoor air quality gas sensors, Invensense ICM-20648 6-axis inertial sensor, and Knowles SPV1840 MEMS microphone. Inputs from these sensors can be transmitted to the cloud and displayed in real-time in a ready-to-use Android/iOS mobile app, enabling developers with limited networking experience to build connected applications quickly.

The onboard EFR32 Mighty Gecko SoC onboard the Thunderboard Sense is powered by an ARM Cortex-M4 processor core, and a companion EFM8 Sleepy Bee microcontroller (MCU) from Silicon Labs allows for fine-grained power profiling and control using Simplicity Studio when connected through the board’s Mini Simplicity adapter. The Mini Simplicity adapter also supports wireless network debugging, and an onboard SEGGER J-Link debugger is also equipped for general programming. 20 breakout pins, four RGB LEDs, and a CR2032 coin cell battery and external battery connector complete the feature set.

The Thunderboard Sense kit (SLTB001A) is available for $36 through distributors such as DigiKey, and the free Thunderboard mobile apps can be downloaded from the Apple Store and Google Play. Access to source code can be found at

For more information on the Thunderboard Sense, visit