Never forget to water your plants again! This Smart Irrigation System continuously monitors the soil moisture level. When the soil gets too dry, it automatically turns on a small water pump to hydrate your plant, turning off once the optimal moisture level is reached.
Components Used:
- Arduino Uno
- Soil Moisture Sensor
- 5V Relay Module
- Mini Submersible Water Pump + Tubing
- External Power Supply (for pump)
How it Works:
The Soil Moisture Sensor acts as a variable resistor. When soil is wet, conductivity increases (resistance lowers). The Arduino reads this analog value. If the value goes above a certain threshold (meaning the soil is dry), the Arduino triggers the Relay, which switches on the Pump.
Arduino Code Snippet:
#define SENSOR_PIN A0
#define RELAY_PIN 7
int dryThreshold = 600; // Adjust based on calibration
void setup() {
pinMode(RELAY_PIN, OUTPUT);
Serial.begin(9600);
}
void loop() {
int moistureLevel = analogRead(SENSOR_PIN);
Serial.print("Moisture: ");
Serial.println(moistureLevel);
// If reading is HIGH, resistance is HIGH -> Soil is DRY
if (moistureLevel > dryThreshold) {
digitalWrite(RELAY_PIN, LOW); // Turn on Pump (Active Low relay)
Serial.println("Watering...");
} else {
digitalWrite(RELAY_PIN, HIGH); // Turn off Pump
}
delay(1000);
}