Conexio Stratus

A tiny, powerful, versatile cellular-IoT prototyping platform with out-of-the-box connectivity

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Conexio Stratus is a tiny (50.8 mm x 22.86 mm) yet powerful development kit for creating cellular-connected electronic projects. It runs best-in-class Zephyr RTOS for connected devices and is a battery-operated platform, making it ideal for prototyping cellular IoT systems such as asset tracking applications, environmental monitoring, and smart meter monitoring just to name a few. ‌ Equipped with the Nordic nRF9160 System in Package (SiP), it supports LTE-M, NB-IoT, and Global Positioning System (GPS). Stratus has two onboard external U.FL antennas, one for the GPS and the other for LTE-M/NB-IoT, enabling it to support a global range of LTE bands.

Built-In Battery Charging, Monitoring and Energy-Harvesting

Stratus has built-in battery charging, monitoring, and energy-harvesting circuitry which makes it easier to connect to and recharge the Li-Po battery, creating fully energy-autonomous applications. In addition, Stratus incorporates an accelerometer as well as a temperature & humidity sensor for detecting both movement and sensing the surrounding environment, right out of the box. Finally, Stratus provides 26 mixed-signal GPIOs for interfacing with external sensors, actuators, and other electronics.

Preloaded With Data and SMS

To connect to IoT cellular networks out-of-the-box, Stratus comes preloaded with 500 MB of data and a total of 250 SMS valid for 10 years with service in more than 100 countries worldwide without additional costs, making it the most versatile IoT development kit in the market.

Useful From Smart Homes To Smart Industry

Stratus is perfect for connecting existing projects to the Cloud or as a gateway to connect other local endpoints without having to worry about the infrastructure cost, making it useful for both professionals and hobbyists.

For example: Stratus is perfect for environmental monitoring and smart agriculture like precision farming, crop monitoring, climate and food supply-chain monitoring, and farm analytics. It’s also excellent for smart energy and utilities, and can ​​enable smart grids, smart metering, and remote diagnostics for easy monitoring and billing. You could use Stratus for fleet management to ​​track your assets in real-time with seamless global coverage and end-to-end visibility, or machine monitoring to enable predictive maintenance and machine monitoring for Industry 4.0 with cellular connectivity. It can be used in retail for smart checkout, inventor, and supply chain management. It can even be used in healthcare to power mission-critical healthcare applications like remote patient monitoring and wearables.


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Features & Specifications

MCU: Nordic nRF9160 Microcontroller with ARM Cortex M33

  • 1 MB Flash
  • 256 kB RAM
  • ARM® TrustZone®
  • ARM® Cryptocell 310
  • Up to 4x SPI, I2C, and UART with Easy DMA
  • I2S w/ EasyDMA
  • 4x PWM with EasyDMA
  • 12bit SADC with EasyDMA
  • 2x RTC
  • PPI (Programmable peripheral interconnect) interface


  • Transceiver and baseband
  • 3GPP LTE release 13 Category M1 and NB1 compliant
  • 3GPP release 14 NB2 compliant
  • GPS receiver (GPS L1 C/A supported) - Active antenna only.
  • RF Transceiver for global coverage supporting bands:
  • Cat-M1: B1, B2, B3, B4, B5, B8, B12, B13, B14, B17, B18, B19, B20, B25, B26, B28, B66
  • Cat-NB1/NB2: B1, B2, B3, B4, B5, B8, B12, B13, B17, B18, B20, B25, B26, B28, B66
  • Supports 4FF Nano SIM
  • Pre-programmed MCUBoot bootloader

Micro USB

  • For USB-to-Serial, DFU, and application firmware programming and debugging plus LiPo battery charging

Energy harvester IC

  • AEM10941 solar energy harvester from E-peas Semiconductors
  • Vin: 50 mV to 5 V
  • Cold start: 3 μW @ 380 mV
  • Power input: 3 μW to 550 mW
  • Maximum power point tracking (MPPT)
  • Supports battery types Li-ion and NiMH
  • Max solar panels: up to 7 solar cells simultaneously

Board power supply

  • 3.3 V Buck/Boost up to 0.9 A of current draw
  • Operating range 2.8 to 5.5 V
  • External LiPo battery connection (2 Pin JST type)
  • Charge rate set to 300 mA with yellow LED indication
  • Maximum output current: 800 mA
  • Current consumption in low-power-mode: < 5 uA

Debugger & Programmer

  • Supports J-Link and CMSIS-DAP based programmers
  • 10-pin 0.05" (1.27 mm) pin connector

User I/O

  • 32 Standard GPIOs (0.1" pitch)
  • 26 user-programmable GPIOs
  • 2 x push buttons (1 Reset, 1 General Purpose connected to P0.12)
  • 1 x user-programmable Green LED connected to D7 (P0.03)

Antenna connections

  • 1 x U.FL for LTE-M/NB-IoT with matching network
  • 1 x U.FL for active GPS antenna

Onboard sensors

  • Latest SHT4x temperature and humidity sensor from Sensirion
  • ST Microelectronics LIS2DH MEMS digital output motion sensor: ultra-low-power high-performance 3-axis Femto accelerometer

Power switch

  • SPDT slide switch for turning ON/OFF the power to the Stratus board


  • 50.8 mm x 22.86 mm (2.0" x 0.9")
  • Weight: ~5 grams.

Conexio Stratus Shield

For expansion and interfacing various sensors and hardware peripherals via standard interfaces (I2C, SPI, & UART) with ease, Conexio Stratus also comes with a shield as an optional addon.

No need for breadboard and soldering iron, working with a Stratus shield requires no soldering and minimal wiring. Just plug the sensors, actuators, or displays into this shield via the standard cables, and focus on coding and application creation.

Stratus Shield Features & Specifications

  • 1 x mikro BUS: add-on board standard from Mikroe, allowing connection to over 800+ click boards.
  • 2 x Sparkfun Qwiic connector: SparkFun's Qwiic Connect System, allowing to connect over 100+ Qwiic products.
  • 1 x Grove I2C connector: Grove is a modular, standardized connector prototyping system by Seeedstudio.
  • 1 x 2 Pin JST connector for plugging the solar panel input.
  • 1 x user-programmable LED
  • 3.3 V operating voltage

Conexio Studio

Conexio Studio is a tool to easily create and debug Conexio Stratus + Zephyr RTOS projects in Visual Studio Code. To make application and project development with Conexio Stratus fast and fun for low-level application designers or novice IoT developers, the Conexio team has developed an extension for Visual Studio Code. Using Conexio Studio, one can build, compile, and deploy codes to Conexio Stratus with minimal effort. Create projects with nRF Connect SDK and Zephyr RTOS with built-in templates created by the Conexio team. All examples and the VSCode extension will be available for download when the campaign starts.

Open Source

Once the campaign is fully funded we will publish our open source files, including the schematics, firmware project files, documentation, and software on GitHub.

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