Automatic Plant Watering System Using Arduino | Soil Sensor + Relay Project

🔧 Project Overview

Components:

• Arduino UNO

• FC-28 Soil Moisture Sensor

• Relay Module (5V, 1 Channel)

• 9V Battery + Water Pump (DC Motor)

• Jumper Wires

• Power Supply

  ✅ All parts available on Shopee and Amazon — perfect for students, beginners, or hobbyists!

Function:
When the soil is dry (detected by the FC-28 sensor), the Arduino activates the relay, which turns on the water pump.

Soil Moisture Sensor

• VCC of the soil moisture sensor connects to the 5V pin on the Arduino.

• GND of the soil moisture sensor connects to the GND pin on the Arduino.

• DO (Digital Output) of the soil moisture sensor connects to D6 on the Arduino.

Relay Module

• VCC of the relay module connects to the 5V pin on the Arduino.

• GND of the relay module connects to the GND pin on the Arduino.

• Signal Pin (S) of the relay module connects to D3 on the Arduino.

Submersible Pump

• Connect one terminal of the submersible pump to the normally open (NO) terminal of the relay.

• Connect the other terminal of the submersible pump to the positive terminal of the power supply for the pump.

• Connect the common (COM) terminal of the relay to the negative terminal of the power supply.

• After you make the circuit just copy and paste the code to your IDE and click on upload.

• DOWNLOAD THE CODE HERE