// Compiled and tested with no errors on 23/06/2023 By Swapnil Umredkar 
/* Measuring water level of any water body with help of ESP32 and
 Rotary encoder,water sensor,relay module with reset button*/
#include <Arduino.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
//***************Pin definitions**********************************//
const int moisturePin = 27;
const int relayPin = 14;

// Threshold values for moisture
const int moistureThreshold = 500; // Adjust this value according to your sensor

#define outputA 12 // CLK pin
#define outputB 13 // DT pin
#define rstbtn  4  // reset button pin
#define LED_BUILTIN  15 //led

volatile int counter = 0; // Add "volatile" keyword for interrupt access
const float pi = 3.14;    // Pi value 

const int R = 7;  // Radius of the wheel from center to edge
const int N = 40; // Number of steps for one rotation
float distance = 0;
void IRAM_ATTR readEncoder() { // Add "IRAM_ATTR" attribute for interrupt handling
  int bValue = digitalRead(outputB);
  if (bValue == HIGH) {
    counter++; // Clockwise
  }
  if (bValue == LOW) {
    counter--; // Counterclockwise
  }
}

// Get the counter value, disabling interrupts.
// This make sure readEncoder() doesn't change the value
// while we're reading it.
int getCounter() {
  int result;
  noInterrupts();
  result = counter;
  interrupts();
  return result;
}
void resetCounter() {
  noInterrupts();
  counter = 0;
  interrupts();
}
void setup() {
  //////////////
 // Initialize the serial communication
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);

  // Set the relay pin as output
  pinMode(relayPin, OUTPUT);
  //////
  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.print("Water Level ");
  lcd.setCursor(0, 1);
  lcd.print("Meassuring Tool..");

  delay(2000);
  lcd.clear();

  // Initialize encoder pins
  pinMode(outputA, INPUT);
  pinMode(outputB, INPUT);
  pinMode(rstbtn, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(outputA), readEncoder, FALLING);

}

void loop() {

  // Delay for a certain interval before taking the next reading
  delay(1000);
  distance = ((2 * pi * R) / N) * getCounter(); // in cm
  lcd.setCursor(0, 0);
  lcd.print("Level:   "); // in cm
  lcd.setCursor(7, 0);
  lcd.print(distance);
  lcd.print("        ");



 // Read the moisture sensor value
  int moistureValue = analogRead(moisturePin);

  // Print the moisture value to the serial monitor
  Serial.print("Moisture value: ");
  Serial.println(moistureValue);

  // Check if the moisture value is below the threshold
  if (moistureValue < moistureThreshold) {
    // Turn on the relay
    digitalWrite(relayPin, HIGH);
    Serial.println("Relay turned ON");
     bool Blink_led =moistureValue <  moistureThreshold;
     digitalWrite(LED_BUILTIN,LOW );
     lcd.setCursor(0, 1);
      lcd.print("Waterlevel not found");

  } else {
    bool  Blink_led =moistureValue > moistureThreshold;
     digitalWrite(LED_BUILTIN, Blink_led );
    // Turn off the relay
    digitalWrite(relayPin, LOW);
     
    Serial.println("Relay turned OFF");
      lcd.setCursor(1, 1);
      lcd.print("Waterlevel Detected");
     
  }
if (digitalRead(rstbtn) == LOW) {
    resetCounter();
  }

  
}