Thunderboard Sense 2 is a brand new feature-rich development board offered by Silicon Labs that provides a quick path to develop and prototype IoT applications such as battery-powered wireless sensor nodes. The board has a range of sensors and comes equipped with powerful multi-protocol EFR32 radio and Bluetooth connectivity. Thunderboard Sense 2 also has an on-board J-Link debugger and is fully supported in Simplicity Studio. You can also connect the board to a mobile app with Bluetooth for connecting it to the cloud.

With Thunderboard Sense 2 collecting environmental and motion data becomes very easy. Thunderboard Sense kits support multiprotocol wireless connectivity including Bluetooth®, Thread, and Zigbee, and its sleek design is supported by free online analytics dashboard and open source mobile apps.

Thunderboard Sense 2 Onboard Specifications

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

Thunderboard Sense 2 AddOn Features

Mobile App

• Mobile app for Android and iOS 
• iOS app implemented in swift
• Android app implanted in native code
• Source code available at GitHub

Mobile App Features

• View sensor data
• Control LEDs and detect button pushes
• Stream sensor data to the cloud

Cloud Streaming

• Data is stored in Firebase
• The web frontend is implemented in ReactJS
  • Using Alt.js as the flux implementation
  • D3.js for data-driven charts
• All source code available

Priced at under 20$, I must say this is one of the best IoT and general-purpose development boards in the market today.