Soil Knows Best: Build a Smart Irrigation System with Arduino Uno

1#include <Wire.h>
2#include <LiquidCrystal_I2C.h>
3
4LiquidCrystal_I2C lcd(0x27, 20, 4);
5
6int sensorPin = A0;
7int relayPin = 7;
8int threshold = 500;
9
10void setup() {
11  pinMode(relayPin, OUTPUT);
12  Serial.begin(115200);
13
14  lcd.init();
15  lcd.backlight();
16
17  lcd.setCursor(0, 0);
18  lcd.print("SMART IRRIGATION");
19  delay(2000);
20  lcd.clear();
21}
22
23void loop() {
24  int moisture = analogRead(sensorPin);
25
26  Serial.print("Value: ");
27  Serial.println(moisture);
28
29  lcd.setCursor(0, 0);
30  lcd.print("Moisture: ");
31  lcd.print(moisture);
32  lcd.print("    ");
33
34  if (moisture > threshold) {
35    digitalWrite(relayPin, HIGH);
36    Serial.println("PUMP ON");
37
38    lcd.setCursor(0, 1);
39    lcd.print("Soil : DRY       ");
40    lcd.setCursor(0, 2);
41    lcd.print("Pump : ON        ");
42  } else {
43    digitalWrite(relayPin, LOW);
44    Serial.println("PUMP OFF");
45
46    lcd.setCursor(0, 1);
47    lcd.print("Soil : WET       ");
48    lcd.setCursor(0, 2);
49    lcd.print("Pump : OFF       ");
50  }
51
52  delay(1000);
53}