Session Teelicht (tea light)

During our hacking events we often had the problem, that someone started the water kettle in the other room to make tea, and forgot about it while chatting with other pople. Then they had to start the kettle again ... and maybe forget it one more time.

To solve this, I did a small IoT-Setup, that was meant to solve this problem.

In the default configuration the following light signals are implemented:

• Blue: The water kettle is idle.
• Red: The water kettle has been switched on and is heating.
• White Blinking: The water kettle has switched off, hot water should be ready.

Required parts:

These are the parts we used. It should also work with other devices, but then you have to adapt the MQTT commands used in the code.

• a Wifi power plug with power measurement (Shelly Plug S)
• a Wifi RGB light bulb (Shelly Duo RGBW)
• a computer to run the MQTT broker and this script (Raspberry Pi)
• a network with a wifi access point

TODO: make device specific code configurable ...

Setup:

I won't go into details about the basic Raspi and IoT setup, because there is plenty of information to find out there about those topics.

1. Setup your Raspberry Pi and install and configure an MQTT broker like mosquitto.

2. Setup your IoT devices for access to your Wifi and MQTT broker

3. Clone this repository into your file system:

    git clone https://github.com/d-s-e/session-teelicht.git /opt/session-teelicht
   

4. Create and activate the virtual environment and install the dependencies:

    cd /opt/session-teelicht
    python3 -m venv .venv
    source .venv/bin/activate
    pip install -r requirements.txt
    deactivate
   

5. Create a user and install the systemd service:

    useradd -U -r -s /usr/sbin/nologin session-teelicht
    cp session-teelicht.service /etc/systemd/system/
    systemctl daemon-reload
    systemctl start session-teelicht
    systemctl enable session-teelicht