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Plant Grower

Django project and django-plantgrower app

Uses

  • Django
  • Django Channels for websockets interface with frontend
  • Django REST framework for API
  • Python Celery for:
    • Periodic tasks such as monitoring and sending data to front end
    • Task Queue for monitoring tasks
  • Redis for Channels and Celery backend
  • Instructions to IoT devices over MQTT
    • Topic Message Format Description
      grow/{grow_id}/instruction ({pin_number}, {boolean}) Turning pins on and off
      grow/{grow_id}/sensors Sensor mapping Send sensor mapping and expects readings back

Architecture Diagram

Link to draw.io

Deployment

All components have a Dockerfile and therefore is easily deployed with Kubernetes. You can deploy this locally on a Raspberry Pi, for example, for maximum privacy. However it is scalable so you can deploy in to a managed container engine and run there.

Raspberry Pi

There are a couple of things to do before we deploy the application, I will not try and do a better job of explaining than Alex Ellis who has already done it so well. My scripts are based on his.

  1. Provision a Raspberry Pi

  2. Install Docker on a Raspberry Pi

    curl -sSL https://get.docker.com | sh

  3. Set Docker to auto-start

    sudo systemctl enable docker

  4. Reboot the Pi, or start the Docker daemon with:

    sudo systemctl start docker

  5. Enable Docker client

    The Docker client can only be used by root or members of the docker group. Add pi or your equivalent user to the docker group:

    sudo usermod -aG docker pi

  6. Install Docker Compose

    Compose can also be run inside a container, from a small bash script wrapper. To install compose as a container run this command:

    sudo curl -L --fail https://github.com/docker/compose/releases/download/1.24.0/run.sh -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
    curl -L https://github.com/docker/compose/releases/download/1.24.0/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose