BME688 Data Logger

This combines the BSEC library from Bosch and bme68x-rust to read and process data from the BME688 sensor, and send it to a graphite server. The project runs on a Raspberry Pi 4B with a armv7l 32-bit OS, with the sensor on a Adafruit breakout board connected with I2C.

Hardware

• Raspberry Pi 4B
• Adafruit BME688
• STEMMA QT / Qwiic JST SH 4-pin Cable with Premium Female Sockets

Dependencies

• Bosch BSEC Library 2.2.0

  Download from the Bosch website.

  Located in the dowloaded zip archive, algo/normal_version/bin/RaspberryPi/PiThree_ArmV6/, copy the files

  • bsec_datatypes.h,
  • bsec_interface.h,
  • libalgobsec.a

  into the project folder lib/.

Configuration

The Graphite server location is configured via environment variables. You can also create file .env in the project root, and input the graphite server location:

GRAPHITE_URL=<your-graphite-server>:2003

Usage

Build the program in release mode:

cargo build --release

Then the CLI program can be run in the background with:

nohup {project directory}/target/release/bme-sensors & disown

You can also setup a systemd service such that it runs on startup.

[Unit]
Description=BME Sensors service
After=network.target
StartLimitIntervalSec=0

[Service]
Type=simple
Restart=always
RestartSec=1
Environment="RUST_LOG=warn"
User=<current-user>
WorkingDirectory=/<project directory>
ExecStart=/<project directory>/target/release/bme-sensors

[Install]
WantedBy=multi-user.target

Use VictoriaMetrics Agent to buffer data in case of network issues:

[Unit]
Description=Victoria Metrics Agent service
After=network.target
StartLimitIntervalSec=0

[Service]
Type=simple
Restart=always
RestartSec=1
User=root
WorkingDirectory=/tmp
ExecStart=/usr/local/bin/vmagent -remoteWrite.url=http://<server-url>:8428/api/v1/write -graphiteListenAddr=:2003

[Install]
WantedBy=multi-user.target