#include <LiquidCrystal_I2C.h>
#include <Wire.h>

// Initialize LCD objects with I2C addresses and screen sizes
LiquidCrystal_I2C lcd1(0x25,16,4);
LiquidCrystal_I2C lcd2(0x26,16,4);
LiquidCrystal_I2C lcd3(0x27,16,4);

// Pin definitions
int soilMoisture1_Pin = A0;
int soilMoisture2_Pin = A1;
int soilMoisture3_Pin = A2;
int valveRelay1_Pin = 13;
int valveRelay2_Pin = 12;
int valveRelay3_Pin = 11;
int motorRelay_Pin = 10;

// Moisture level thresholds % (adjusted for each sensor)
int dryThreshold1 = 50;
int dryThreshold2 = 50;
int dryThreshold3 = 50;

// Defined soil moisture initial value
int soilMoisturelvl1 = 0;
int soilMoisturelvl2 = 0;
int soilMoisturelvl3 = 0;

void setup() {
  // put your setup code here, to run once:
  // Set pin modes
  pinMode(soilMoisture1_Pin, INPUT);
  pinMode(soilMoisture2_Pin, INPUT);
  pinMode(soilMoisture3_Pin, INPUT);
  
  pinMode(valveRelay1_Pin, OUTPUT);
  pinMode(valveRelay2_Pin, OUTPUT);
  pinMode(valveRelay3_Pin, OUTPUT);
  pinMode(motorRelay_Pin, OUTPUT);

  // Initialize relays as off
  digitalWrite(valveRelay1_Pin, HIGH);
  digitalWrite(valveRelay2_Pin, HIGH);
  digitalWrite(valveRelay3_Pin, HIGH);
  digitalWrite(motorRelay_Pin, HIGH);

  lcd1.init();
  lcd1.backlight();
  lcd2.init();
  lcd2.backlight();
  lcd3.init();
  lcd3.backlight();
  Serial.begin(9600);;

}

// Function to map sensor value to percentage (0 to 1023 -> 30% to 80%)
int mapToMoisturePercentage(int sensorValue) {
  return map(sensorValue, 1023, 0, 0, 100); // 1023 (dry) -> 30%, 0 (wet) -> 80%
}

void loop() {
  // put your main code here, to run repeatedly:

  soilMoisturelvl1 = analogRead(soilMoisture1_Pin);
  soilMoisturelvl2 = analogRead(soilMoisture2_Pin);
  soilMoisturelvl3 = analogRead(soilMoisture3_Pin);

// Debugging: Print values to Serial Monitor
  Serial.print("Soil Moisture 1: ");
  Serial.println(soilMoisturelvl1);
  Serial.print("Soil Moisture 2: ");
  Serial.println(soilMoisturelvl2);
  Serial.print("Soil Moisture 3: ");
  Serial.println(soilMoisturelvl3);
  
  // Map sensor values to percentage
  int soilmoisturePercent1 = mapToMoisturePercentage(soilMoisturelvl1);
  int soilmoisturePercent2 = mapToMoisturePercentage(soilMoisturelvl2);
  int soilmoisturePercent3 = mapToMoisturePercentage(soilMoisturelvl3);
  
  // Display readings on LCDs
  lcd1.clear();
  lcd1.setCursor(0,0);
  lcd1.print("Soil Moisture 1: ");
  lcd1.setCursor(0,1);
  lcd1.print(soilmoisturePercent1);
  lcd1.print("%");

  lcd2.clear();
  lcd2.setCursor(0,0);
  lcd2.print("Soil Moisture 2: ");
  lcd2.setCursor(0,1);
  lcd2.print(soilmoisturePercent2);
  lcd1.print("%");

  lcd3.clear();
  lcd3.setCursor(0,0);
  lcd3.print("Soil Moisture 3: ");
  lcd3.setCursor(0,1);
  lcd3.print(soilmoisturePercent3);
  lcd1.print("%");

  // Control water valves and pump based on soil moisture readings
  if (soilmoisturePercent1 > dryThreshold1) {
    digitalWrite(valveRelay1_Pin, LOW);  // Open valve 1
  } else {
    digitalWrite(valveRelay1_Pin, HIGH);   // Close valve 1
  }

  if (soilmoisturePercent2 > dryThreshold2) {
    digitalWrite(valveRelay2_Pin, LOW);  // Open valve 2
  } else {
    digitalWrite(valveRelay2_Pin, HIGH);   // Close valve 2
  }

  if (soilmoisturePercent3 > dryThreshold3) {
    digitalWrite(valveRelay3_Pin, LOW);  // Open valve 3
  } else {
    digitalWrite(valveRelay3_Pin, HIGH);   // Close valve 3
  }

  // Control water pump
  if (soilmoisturePercent1 > dryThreshold1 || soilmoisturePercent2 > dryThreshold2 || soilmoisturePercent3 > dryThreshold3) {
    digitalWrite(motorRelay_Pin, LOW);   // Turn on water pump
  } else {
    digitalWrite(motorRelay_Pin, HIGH);    // Turn off water pump
  }

  delay(2000);  // Wait for 2 seconds before taking another reading
}