Stratus (Gen 1) Overview

nRF9160 + AEM10941

Board Layout

Technical specifications and features

Most of the specifications outlined below are based on Nordic's nRF9160 Product Specification.

MCU: Nordic nRF9160 Microcontroller with ARM Cortex M33

  • 1MB Flash

  • 256kB 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

  • Modem

    • 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


  • 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

  • 3.3V Buck/Boost up to 0.9A of current draw

  • Operating range 2.8 to 5.5V

  • External LiPo battery connection (2 Pin JST type)

  • Charge rate set to 300mA with RED LED indication

  • Maximum output current: 800mA

Debugger & Programmer

  • Supports J-Link and CMSIS-DAP-based programmers

  • 10-pin 0.05" (1.27mm) 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


  • 50.8mm x 22.86mm (2.0" x 0.9")

  • Weight: ~5 grams.

Stratus Shield

For expansion and interfacing various sensors and hardware peripherals, Conexio Stratus also comes with a shield (which can be purchased separately).

Forget about breadboard and soldering iron, working with a Straus shield requires no soldering and minimal wiring. Just plug the sensors, actuators, or displays into this shield via the standard cables, allowing you to focus on coding and application creation. Isn't that cool!

The shield supports:

  • 1 x mikro BUS: add-on board standard from Mikroe, allowing to connect over 800+ click boards.

  • 2 x Sparkfun Qwiic connector: SparkFun's Qwiic Connect System, allows connecting 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.

What's included in the box

Congratulations on receiving your Conexio Stratus kit. Your package includes:


  • 1 x Conexio Stratus dev kit.

  • 1 x 1NCE IoT Sim card

  • 1 x Getting started instructions card

Preloaded Firmware

Out-of-the-box, Stratus kit comes with the pre-loaded firmware that periodically samples all the onboard sensors (temperature, humidity, accelerometer, and battery) and blinks the LEDs.

To view the serial logs, start your favorite serial terminal such as putty or CoolTerm, set the baud rate to 115200 and you should see the following output:

SPM: NS image at 0x20200
SPM: NS MSP at 0x20015a40
SPM: NS reset vector at 0x22d75
SPM: prepare to jump to Non-Secure image.
*** Booting Zephyr OS build v2.6.99-ncs1  ***
Hello from conexio_stratus
x: 0.229824, y: 0.344736, z: 9.690912
temp: 25.197604, humidity: 30.781860
Battery level: 4.384 V, 10000 pptt
x: 0.114912, y: 0.383040, z: 9.729216
temp: 25.242999, humidity: 30.596847
Battery level: 4.514 V, 10000 pptt
x: 0.076608, y: 0.459648, z: 9.614304
temp: 25.253681, humidity: 30.348892
Battery level: 4.470 V, 10000 pptt

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