Seven Clicker Sample

This is an end-to-end Internet of Things (IoT) sample project which collects data from a temperature and humidity sensor, and publishes it to AWS IoT Core MQTT broker using cellular connectivity (LTE).

The project is based on Zephyr Project and hardware from MIKROE.

The application source code is largely based on the following Zephyr Project samples:

• AWS IoT Core MQTT
• Cellular modem
• HTS221 Temperature and Humidity Monitor

The project is not intended to be a complete reference design for a commercial product, but rather a source of inspiration.

Hardware

Hardware used in this project:

• J-Link PLUS Compact
• MIKROE - CLICKER FOR STM32
• MIKROE - LTE IOT 7 CLICK
• MIKROE - TEMP&HUM CLICK
• YB0014AA 4G/GNSS L1 3-in-1 screw mount combo external antenna

You also need:

• Micro-B USB cable
• SIM card with a data plan
• J-Link PLUS Compact adapter for the CLICKER FOR STM32 JTAG connector

Getting Started

Prerequisites

Before getting started, make sure you have a proper Zephyr development environment:

• Zephyr - Install Linux Host Dependencies
• Zephyr - Install Zephyr SDK

You also need:

• An AWS account with access to AWS IoT Core

  • default thing name is myThingName (adjust with AWS_THING_NAME Kconfig option)
  • default MQTT topic is myThingName/data (adjust with AWS_PUBLISH_TOPIC Kconfig option)

• AWS credentials and necessary information

  Register a thing in AWS IoT Core and download the certificate and private key. Copy these files to the app/src/creds directory. Run the app/src/creds/convert_keys.py script, which will generate files ca.c, cert.c and key.c.

Setup project

Create workspace and change in to it:

mkdir -p ~/src/seven-clicker-sample-workspace && cd ~/src/seven-clicker-sample-workspace

Create Python virtual environment:

python -m venv .venv

Active Python virtual environment:

. .venv/bin/activate

Install west:

pip install west

Initialize workspace:

west init -m https://github.com/id8-engineering/seven-clicker-sample --mr main .

Change directory:

cd seven-clicker-sample

Fetch and checkout sources:

west update

Install Python dependencies:

west packages pip --install

Build firmware

west build -p always -b mikroe_clicker_2 app \
    -DCONFIG_MODEM_CELLULAR_APN=\"your_apn\" \
    -DCONFIG_AWS_ENDPOINT=\"your-iot-endpoint-ats.iot.your-region.amazonaws.com\"

Flash firmware

west flash -r jlink

Report issues

If you run into problems, you can ask for help in our issue tracker on GitHub.

Credits

This project was originally developed as an internship assignment by @Dexter9532, with mentorship from @mirzak and @id8-engineering. It represents an early milestone in the development of Seven, a rapid‑prototyping platform for cellular , resource constrained IoT devices.