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Introduction

Simple script utilities to add BME680 sensor readings to Apple Homekit using a Raspberry PI with minimal configuration.

After running the program you'll be given the QR code used to add the sensor as an accessory in Homekit.

Installing

Ensure you are the pi user. Clone the repo in home and then install requirements.

Cloning the project

cd /home/pi && git clone [email protected]:dnutiu/bme680-homekit.git && cd bme680-homekit
sudo apt-get install libavahi-compat-libdnssd-dev
pip3 install -r requirements.txt

Application

The app directory contains the source code of this application

Sensor values are collected and exposed in HomeKit and as prometheus metrics.

By default, metrics can be accessed on port 8000.

Configuration

Before running the program edit the config.yaml file and replace at least persist_file field.

The program will search for the config.yaml file in the current directory but this can be configured to another directory by settings the HOMEKIT_CONFIG environment variable.

Running

Run the program once to pair it with your ios. ex:

python3 -m app.main 
Setup payload: X-HM://0023K50QET2YB
Scan this code with your HomeKit app on your iOS device:

Or enter this code in your HomeKit app on your iOS device: 053-86-998

SystemD Service

Edit ./systemd/bme680-homekit.service and replace relevant variables such as WorkingDirectory, ExecStart and User.

Run sudo ./systemd/install.sh to install SystemD service automatically on your system.

Or follow the manual steps.

Copy the systemd service.

sudo cp ./systemd/bme680-homekit.service /etc/systemd/system
sudo systemctl status bme680-homekit
● bme680-homekit.service - Bme680 Homekit service
     Loaded: loaded (/etc/systemd/system/bme680-homekit.service; disabled; vendor preset: enabled)
     Active: inactive (dead)

Start the service

sudo systemctl start bme680-homekit
sudo systemctl status bme680-homekit
● bme680-homekit.service - Bme680 Homekit service
     Loaded: loaded (/etc/systemd/system/bme680-homekit.service; disabled; vendor preset: enabled)
     Active: active (running) since Mon 2022-02-21 20:10:30 GMT; 935ms ago
   Main PID: 1722 (python3)
      Tasks: 1 (limit: 780)
        CPU: 895ms
     CGroup: /system.slice/bme680-homekit.service
             └─1722 /usr/bin/python3 /home/pi/bme680-homekit/main.py

Feb 21 20:10:30 raspberrypi systemd[1]: Started Bme680 Homekit service.

Troubleshooting

If you get an error for FileNotFound:

Traceback (most recent call last):
  File "/home/denis/bme680-homekit/sensors/main.py", line 112, in <module>
    driver.add_accessory(accessory=get_bridge(driver))
  File "/home/denis/bme680-homekit/sensors/main.py", line 101, in get_bridge
    bridge.add_accessory(Bme680Sensor(accessory_driver, "Sensor"))
  File "/home/denis/bme680-homekit/sensors/main.py", line 33, in __init__
    self.sensor = bme680.BME680(bme680.I2C_ADDR_PRIMARY)
  File "/home/denis/.local/lib/python3.9/site-packages/bme680/__init__.py", line 43, in __init__
    self._i2c = smbus.SMBus(1)
FileNotFoundError: [Errno 2] No such file or director

You will need to active I2C interface with sudo raspi-config -> Interfacing -> I2C

Prometheus

Prometheus is a system for monitoring and alerting.

Before installing Prometheus you will need to tweak the prometheus/prometheus.service file, especially the config file and storage path since they contain the hardcoded string: /home/pi/bme680-homekit/.

To install it run prometheus./install.sh.

Prometheus server will listen on port :9090

Grafana

Grafana can be used to create dashboard and visualise prometheus metrics. To install it run grafana/install.sh

Grafana is accessible on port :80. Premade dashboards can be found in the grafana/dashboards folder.