SelfHydro - Automated Hydroponics

This is an automated hydroponic system, focusing on getting the current state of the system.

The system currently consists of the following:

• Lights on a timed cycle
• Air pump cycle
• Water level of the tank
• Temperature, Humidity, Electrical Conductivity sensors

Overview of system architecture

Sensors

• Water temperature sensor is a DS18B20 sensor.
• Ambient temperature sensor is a MCP9808 sensor, communicating using I2C.
• Water level sensor is Ultrasonic HC-SR04 sensor.

The system is designed to work on the Raspberry Pi 3.

MQTT Comms to GCP

Every 3 hours the system will send a json message with the telemetry to google cloud IoT core.

To add the config file for communication with GCP, run the following step:

1. Create a file config/googleCloudIoTConfig.json
2. Insert the following json:

{
  "location": "<location>",
  "projectID": "<projectID>",
  "registryID": "<registryID>",
  "deviceID": "<deviceID>"
}

Installing Selfhydro up as a service

1. cp selfhydro.service /etc/systemd/system/selfhydro.service
2. sudo systemctl enable selfhydro.service

Wifi-Connect

For first time setup of device, wifi connect is used to setup the wifi network.

Install using:

bash <(curl -L https://github.com/resin-io/resin-wifi-connect/raw/master/scripts/raspbian-install.sh)

Setting up RaspberryPi for the first time

• Enable 1-wire:
  • sudo nano /boot/config.txt
  • sudo reboot
  • sudo modprobe w1-gpio
  • sudo modprobe w1-therm

Mosquite MQTT Broker

docker run -it -p 1883:1883 -p 9001:9001 --restart always -d eclipse-mosquitto

Roadmap:

• Config file for pins being used on Raspberry Pi
• Refactor all sensors into sensor directory
• Setup CICD pipeline