Demo Zephyr - Adafruit Feather nRF52840

Embedded application for environmental sensor data collection and satellite transmission via Argos SMD module, built on Zephyr RTOS.

Features

• Multi-sensor acquisition (BMP390, SHTC3, MPU-6050)
• Configurable data aggregation (MEAN, MIN, MAX, MEDIAN)
• Satellite transmission via Argos SMD module
• Dual command interface: USB CDC and BLE NUS
• AT command protocol
• NVS persistent configuration
• RGB LED status indication

Quick Start

Build

west build -b adafruit_feather_nrf52840 -p

Flash

Option A: UF2 Bootloader

1. Double-click RESET button (LED blinks red, FTHR840BOOT drive appears)
2. Run: west flash --runner uf2

Option B: J-Link

west flash --runner jlink

Connect

screen /dev/ttyACM0 115200

Test with:

AT+DUMP

Documentation

Full documentation is available in the doc/ directory:

Document	Description
Quick Start	Build, flash, and first steps
Hardware Setup	Board configuration and sensors
AT Commands	Complete command reference
Architecture	System design and data flow
UI Integration	BLE and USB interface details
Configuration	NVS persistent storage

Supported Hardware

Board

• Adafruit Feather nRF52840

Sensors (I2C - STEMMA QT)

Sensor	Measurements	I2C Address
BMP390	Pressure, Temperature	0x77
SHTC3	Temperature, Humidity	0x70
MPU-6050	Accelerometer, Gyroscope	0x68

Essential AT Commands

# System
AT+DUMP              # Full configuration dump

# Sensors
AT+SENSOR_DETECT     # Detect connected sensors
AT+SENSOR_READ       # Read all sensors

# Data Logger
AT+LOG_STATUS        # Buffer status
AT+LOG_DUMP          # Export as CSV

# BLE
AT+BLE_STATUS        # Connection status
AT+BLE_TIMEOUT=120   # Auto-disconnect timeout

# Configuration
AT+CONFIG_SAVE       # Save to NVS
AT+CONFIG_LOAD       # Load from NVS

See AT Commands Reference for the complete list.

Project Structure

demo-zephyr/
├── src/
│   ├── core/           # Main application
│   ├── sensors/        # Sensor manager
│   ├── connectivity/   # BLE, USB, Satellite
│   ├── data/           # Logger, Payload
│   ├── interfaces/     # Command handler
│   ├── system/         # LED, Config storage
│   └── transmission/   # Send/Stream managers
├── boards/             # Board overlays and configs
├── doc/                # Documentation
└── tests/              # Unit tests

License

See LICENSE file.