Smart Garden Irrigation System for Home Use: ESP32 FYP Build Guide

Why a Smart Irrigation System Works Well as an FYP

Automatic irrigation is a classic FYP topic, but most student builds stop at "if soil is dry, turn on pump." That's a fine starting point, but examiners have seen it dozens of times. The version below is scoped for home/rooftop garden use with a mobile dashboard and scheduling — enough extra depth to stand out without needing farm-scale hardware.

It's also genuinely practical. A working prototype that keeps a small set of plants alive over your project's duration is a strong, undeniable demo — no simulation needed.

Hardware Components

Component	Purpose	Cost (RM)
ESP32 Development Board	Microcontroller + WiFi	RM 20–30
Capacitive Soil Moisture Sensor	Moisture reading (corrosion-resistant)	RM 8–12 each
5V Relay Module	Pump control	RM 5–8
Mini Submersible Water Pump	Water delivery	RM 10–15
Water Tubing	Delivery to plants	RM 5–10
DHT22 Sensor (optional)	Ambient temp/humidity	RM 10–15
Water Reservoir	Water source	RM 10–20

Total hardware cost: RM 60–100 (single-zone build)

How It Works

1. A capacitive soil moisture sensor reads moisture level every few minutes (capacitive sensors don't corrode like resistive ones, which matters for a project that needs to survive weeks of testing)
2. When moisture drops below a threshold you set, the ESP32 triggers the relay to run the pump for a fixed duration
3. Readings and pump events are logged and pushed to a dashboard (Blynk works well here) so you can monitor your plants remotely
4. Optional scheduling lets you restrict watering to early morning or evening, avoiding water loss to midday heat
5. A DHT22 sensor can factor ambient humidity into the watering decision — skip watering if it just rained, for example

Wiring Overview

Soil moisture sensor:

• VCC → 3.3V
• GND → GND
• AOUT → GPIO 34 (ADC pin)

Relay to pump:

• IN → GPIO 26
• Pump wired through relay's NO (normally open) terminal to a separate power source (do not power the pump from the ESP32 directly)

DHT22 (optional):

• Data → GPIO 4

Core Logic (Pseudocode)

void loop() {
  int moisture = readSoilMoisture();  // 0-100%
  float humidity = readAmbientHumidity();

  if (moisture < DRY_THRESHOLD && isWithinScheduledWindow() && humidity < 85) {
    activatePump(durationSeconds: 10);
    logEvent("Watered", moisture, timestamp);
  }

  pushToDashboard(moisture, humidity, pumpStatus);
  delay(300000); // check every 5 minutes
}

Calibrate DRY_THRESHOLD against your specific soil and pot size before finalising — this is worth mentioning in your documentation, since examiners like to see you tested and tuned the system rather than using arbitrary numbers.

Presentation Tips

• Bring a potted plant with the sensor already installed to your viva — a live moisture reading updating on your phone is a strong, simple demo
• Keep a log of watering events over at least 2 weeks as evidence the system worked unattended
• Be ready to explain why you chose a capacitive sensor over a resistive one — it's a common technical question and shows deliberate component selection

Scope Recommendations

For a Diploma FYP: Moisture sensing + automatic pump control For a Degree FYP: Add scheduling + remote dashboard monitoring For Merit/Distinction: Add multi-zone watering, ambient humidity logic, and a mobile app with watering history and analytics

Need This Project Done?

Rectronx Circuits builds complete smart irrigation systems — sensor calibration, dashboard setup, and full FYP documentation included. WhatsApp us for a free quote within 2 hours.

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