This is my single project for all IoT devices I develop. I'm sharing it in hope to help others with their own IoT projects.

Sensor devices measure environmental data like temperature or humidity and send the values to centralized database.

I use InfluxDB + Grafana for collecting and presenting the sensor data.

My development environment:

• PlatformIO Core
• crudini
• CLion IDE
  • CLion + PlatformIO integration

Step by step:

1. Buy hardware. See platformio.ini for the hardware I use. Assemble the headers, sensors etc.

2. Select or add new env in platformio.ini, adjust build_flags.

3. Copy include/config.h.templ to include/config.h and fill the credentials for Wi-Fi etc.

4. Run ./pio_init to apply the changes (and install optional libraries)

5. Connect the device and run pio run --target upload to program it.

6. Debug with pio device monitor.

Provides centralized control of all connected devices. Each device has to actively query for new firmware and commands.

URLs:

• /update - ArduinoOTA firmware update (each device gets its own firmware)
• /control - Control commands for each device, headers contain "X-Seq" which indicates a change
• /write - sensor data, forward to InfluxDB

Implementation:

• Python + frontend web server (nginx)

Here I'll document the assembled devices, with links to the parts and also some photos.