An Arduino-based project designed to automate the process of watering plants. This system monitors the soil moisture level and activates a water pump only when necessary, ensuring optimal plant health while conserving water. This project was developed for the Digital Logic Design (DLD) lab course.
This project creates a self-regulating system for plant irrigation, minimizing the need for manual intervention. It uses a soil moisture sensor to detect the water level in the soil. When the moisture drops below a set threshold, a 5V relay is triggered, which activates a water pump to irrigate the plant until the desired moisture level is achieved.
- Automation: Automatically water plants based on real-time soil moisture data.
- Water Conservation: Provide a precise amount of water only when needed to prevent waste.
- Improved Plant Health: Ensure consistent and optimal moisture levels for healthy plant growth.
- Hands-On Learning: Gain practical experience with microcontrollers, sensors, and system integration.
| Component | Purpose |
|---|---|
| Arduino Uno | The microcontroller that serves as the brain of the system. |
| Soil Moisture Sensor | Measures the volumetric water content in the soil. |
| 5V Relay Module | Acts as an electronically controlled switch to safely turn the water pump on/off. |
| Mini Water Pump | The pump used to deliver water to the plant. |
| Jumper Wires | To connect all the components together. |
The system follows a simple but effective logic:
- Sensor Reading: The soil moisture sensor is placed in the plant's soil. It has a digital output (DO) that goes HIGH when the soil is sufficiently moist and LOW when it is dry.
- Arduino Processing: The Arduino Uno continuously reads the digital signal from the sensor on pin 6.
- Pump Control:
- If the sensor reads HIGH (wet soil), the Arduino sends a LOW signal to the relay module connected to pin 3. This deactivates the relay, turning the water pump OFF.
- If the sensor reads LOW (dry soil), the Arduino sends a HIGH signal to the relay module. This activates the relay, turning the water pump ON.
| From | To |
|---|---|
| Soil Sensor VCC | Arduino 5V |
| Soil Sensor GND | Arduino GND |
| Soil Sensor DO | Arduino Digital Pin 6 |
| Relay Module VCC | Arduino 5V |
| Relay Module GND | Arduino GND |
| Relay Module IN | Arduino Digital Pin 3 |
| Water Pump +ve | Relay COM & External Power +ve |
| Water Pump -ve | External Power -ve |
Note: The water pump should be powered by an external power source, as the Arduino cannot provide enough current.
- Assemble the circuit as shown in the diagram.
- Upload the code (
Plant_Watering_System.ino) to your Arduino Uno board. - Place the soil sensor into the soil of your plant.
- Power up the Arduino and the external power supply for the pump.
- The system will now automatically water your plant whenever the soil gets too dry!
- IoT Integration: Use an ESP8266 or ESP32 to send sensor data to the cloud and control the system remotely via a web dashboard or mobile app.
- Multiple Plants: Expand the system with more sensors and valves to manage multiple plants independently.
- Data Logging: Store moisture data over time to analyze water consumption and plant health trends.
Project by: Muhammad Haroon SZABIST ISB, BS-AI-2A