Google Assistant Twilight Light Temperature/Brightness Automator

This project is a prototype that uses Google Assistant to automatically control the brightness and temperature of Google Assistant connected lights during dawn and dusk. This project is a similar concept to f.lux but for smart lights in your house.

The algorithm uses a sine function so that transitions start and end slowly, and are quicker half way between start/end of sunrise/sunset. This algorithm is likely inaccurate to how the light curve really works.

Due to the limit of 500 requests per day to the Google Assistant API, during dawn/dusk the lights will only be updated once per minute - so you may notice some slight colour/brightness changes.

Set up project

• Install portaudio apt install libportaudio2
• Create a new Python 3.6+ virtual environment python3 -m venv venv
• Activate the virtual environment source ./venv/bin/activate
• Install the requirements pip install -r requirements.txt

Setting up credentials

First follow the following two sections:-

• https://github.com/Melvin-Abraham/Google-Assistant-Unofficial-Desktop-Client/wiki/Setup-Authentication-for-Google-Assistant-Unofficial-Desktop-Client#device-registration
• https://github.com/Melvin-Abraham/Google-Assistant-Unofficial-Desktop-Client/wiki/Setup-Authentication-for-Google-Assistant-Unofficial-Desktop-Client#configure-consent-screen

Next copy your OAuth2 client secret json file in to the credentials directory of this repo and run:-

$ cd credentials
$ google-oauthlib-tool --save --headless --scope https://www.googleapis.com/auth/assistant-sdk-prototype --credentials ./credentials.json --client-secrets client_secret_whatever.json

Set up local.py configuration

Next modify the local.py file to match your local settings, the LATITUDE and LONGITUDE should be as close to where your lights are located as possible - Google Maps can give you the GPS coordinates of your address if required.

Update the CITY/COUNTRY/TIMEZONE to match your location as well.

Finally make sure the LIGHT_NAME is correct for your light/light group. If, for example, you say Hey Google, turn on the bedroom light then the LIGHT_NAME is bedroom light.

It's important that the machine running the script correctly has the local timezone configured, and the time is synchronized (With NTP)

$ sudo dpkg-reconfigure tzdata

Run the script

There is no systemd unit or daemon for this project yet - I've just been running it inside tmux.

$ tmux
$ source ./venv/bin/activate
$ python main.py