fufarm_hydro

A standalone Hydroponics Control system.

This provides a web app that can be used to monitor and control the nutrient and acid dosing of a hydroponics system.

The app is designed to work in two ways:

• locally, where it is installed on a Raspberry Pi and the probes and peristaltic pumps are attached directly to the Raspberry Pi (using a DFRobot IO Expansion HAT for Raspberry Pi) and controlled via MQTT-IO.
• remotely, where the sensors and control are on a separate system (such as an Arduino) and control is facilitated via MQTT [only partially implemented].

The app is started by running the ./run_webapp.sh script in the main directory and can be accessed at http://localhost:5000

Architecture

The application is based on Flask and architected with the following classes:

• AppState - holds the various control variables which can be read/set by different processes.
• HydroController hydrocontrol_ui/hydrocontrol/controller.py - loops and checks for updates of the AppState and invokes actions based on state changes.
• Flask App - web app hydrocontrol_ui/views.py the UI for the controller. It runs in the same process as the HydroController, and shares it's AppState, so any changes made by the UI are propagated to the HydroController.
• ec_calibrator hydrocontrol_ui/hydrocontrol/ec_calibrator.py functions to run calibration locally with MQTT-IO controlled peristaltic pump.

Installation

Install Adafruit Blinka https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi

Enable i2c

sudo raspi-config nonint do_i2c 0

Install required system-wide packages

sudo apt-get install -y i2c-tools libgpiod-dev python3-libgpiod

Set up the virtual python environment a(nd install all the requried packages if necessary)

#pip3 install rpi-lgpio #pip3 install --upgrade adafruit-blinka #pip3 install adafruit-circuitpython-motor

source ./venv_activate.sh