// Automatic Irrigation System - Project Submission Version
// Om's Project
const int sensorPin = A0; // Moisture sensor analog output
const int relayPin = 8; // Relay IN pin (active LOW)
// Threshold value: adjust based on dry and slightly wet soil readings
const int threshold = 600;
void setup() {
pinMode(sensorPin, INPUT_PULLUP); // Fix floating pin issue
pinMode(relayPin, OUTPUT);
digitalWrite(relayPin, HIGH); // Relay OFF at start
Serial.begin(9600); // Optional: view sensor readings
}
void loop() {
int moistureValue = analogRead(sensorPin); // Read sensor
Serial.print("Moisture Value: ");
Serial.println(moistureValue);
// Check soil condition
if (moistureValue < threshold) { // Soil is dry
digitalWrite(relayPin, LOW); // Turn motor ON
} else { // Soil is wet
digitalWrite(relayPin, HIGH); // Turn motor OFF
}
delay(500); // Small delay for stability
}
