Modular Hydroponic Tower

🌿 Modular Hydroponic Tower (Smart Garden with Arduino)

Bring the future of gardening home! With this modular hydroponic tower, you can grow herbs, lettuce, or strawberries vertically in a space-saving, clean, and highly efficient way.

The design is fully modular: You decide how tall your tower will be! Simply print as many plant elements as you want and securely stack them together.

💡 System Overview

• Substrate: Simple expanded clay pebbles are used as the growing medium for the plants. This provides perfect support for the roots with maximum aeration.
• Irrigation: A compact 5V water pump transports the water with nutrients to the top of the tower, from where it evenly trickles down through all modules.
• Smart Control: The pump is controlled by a simple transistor circuit from an Arduino. This allows the irrigation to be perfectly automated (e.g., turning on for 5 minutes every 30 minutes), saving water and electricity.

🛠️ Required Components

3D-Printed Parts:

• 1x Base / Lid for the water tank
• Xx Plant modules (stackable as desired)
• 1x Tower top (water distributor)
• Xx Plant pots / Inserts (for the expanded clay pebbles)
• Xx Supports for rings
• Xx Rings

Electronics & Hardware:

• Microcontroller: 1x Arduino (e.g., Nano or Uno)
• Pump: 1x 5V Mini submersible pump (incl. suitable hose leading upwards)
• Transistor: 1x Logic Level MOSFET Transistor (IRLZ44N) for safely switching the pump via the Arduino
• Resistor: 1x 1k Ohm resistor (for the transistor base), 1x 100 Ohm for protecting the Arduino control pin, 2x 10k Ohm for the USB-Breakout
• Flyback diode: 1x 1N4007 Diode (to protect the Arduino from pump back-currents)
• Capacitor: 1x Electrolytic capacitor 470µF
• Arduino Nano
• USB-Breakout
• Power Supply: 5V power adapter (or USB)
• Substrate: Expanded clay pebbles (approx. 6-10mm grain size)

🖨️ Printing Recommendations

Since the parts are constantly in contact with water and nutrients, please note the following:

• Material: PETG (preferred) or PLA Tough. PETG is naturally more water-resistant and food-safe than standard PLA.
• Walls / Perimeter: At least 3–4 wall lines. This increases stability and ensures the modules are completely watertight.
• Infill: 15% (Gyroid)

🔌 Electronics & Code Note

A possible code for the Arduino would be:

// Pin definition
const int pumpPin = 3;

// Time intervals in milliseconds
const unsigned long runTime = 300000;    // 5 minutes
const unsigned long pauseTime = 1800000; // 30 minutes

void setup() {
 pinMode(pumpPin, OUTPUT);
 
 // Ensure the pump is off at startup
 digitalWrite(pumpPin, LOW);
}

void loop() {
 // Turn on pump for 5 minutes
 digitalWrite(pumpPin, HIGH);
 delay(runTime); 
 
 // Turn off pump for 30 minutes
 digitalWrite(pumpPin, LOW);
 delay(pauseTime); 
}

Alternative:

Get a pump with a power adapter and control it via a Wi-Fi smart plug.

Feel free to check out my page for many more creative solutions.