/************* BLYNK CONFIG *************/
#define BLYNK_TEMPLATE_ID "TMPL3Wo9hei64"
#define BLYNK_TEMPLATE_NAME "Water Quality Monitor"
#define BLYNK_AUTH_TOKEN "kT8VK97GlJO4RuNc58GDEh7iKy7ee0LI"

/************* LIBRARIES *************/
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <OneWire.h>
#include <DallasTemperature.h>

/************* WIFI *************/
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

/************* SENSOR PINS *************/
#define PH_PIN 34
#define TURB_PIN 35
#define TDS_PIN 32
#define DO_PIN 33
#define ONE_WIRE_BUS 4

/************* LCD *************/
LiquidCrystal_I2C lcd(0x27, 16, 2);

/************* TEMP SENSOR *************/
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

/************* TIMER *************/
BlynkTimer timer;

/************* SCREEN CONTROL *************/
int screen = 0;

/************* FUNCTION *************/
void sendData() {

  // Read sensors
  float pH = (analogRead(PH_PIN) / 4095.0) * 14.0;
  float turbidity = (analogRead(TURB_PIN) / 4095.0) * 100.0;
  float tds = (analogRead(TDS_PIN) / 4095.0) * 1000.0;
  float DO = (analogRead(DO_PIN) / 4095.0) * 14.0;

  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);

  // Send to Blynk
  Blynk.virtualWrite(V0, pH);
  Blynk.virtualWrite(V1, temperature);
  Blynk.virtualWrite(V2, turbidity);
  Blynk.virtualWrite(V3, DO);
  Blynk.virtualWrite(V4, tds);

  // Serial Monitor
  Serial.println("====== Water Quality ======");
  Serial.print("pH: "); Serial.println(pH);
  Serial.print("Temp: "); Serial.println(temperature);
  Serial.print("Turbidity: "); Serial.println(turbidity);
  Serial.print("TDS: "); Serial.println(tds);
  Serial.print("DO: "); Serial.println(DO);
  Serial.println("===========================\n");

  // LCD DISPLAY
  lcd.clear();

  if (screen == 0) {
    // Screen 1
    lcd.setCursor(0, 0);
    lcd.print("pH:");
    lcd.print(pH,1);

    lcd.setCursor(8, 0);
    lcd.print("T:");
    lcd.print(temperature,1);

    lcd.setCursor(0, 1);
    lcd.print("Tb:");
    lcd.print(turbidity,0);

    lcd.setCursor(8, 1);
    lcd.print("DO:");
    lcd.print(DO,0);
  }

  else {
    // Screen 2
    lcd.setCursor(0, 0);
    lcd.print("TDS:");
    lcd.print(tds,0);
    lcd.print("ppm");

    lcd.setCursor(0, 1);

    // Water Quality Logic
    if (pH >= 6.5 && pH <= 8.5 &&
        turbidity < 50 &&
        tds < 500 &&
        DO > 5 &&
        temperature >= 20 && temperature <= 35) {

      lcd.print("Quality:GOOD");
    } else {
      lcd.print("Quality:BAD ");
    }
  }

  // Switch screen
  screen = !screen;
}

/************* SETUP *************/
void setup() {
  Serial.begin(115200);

  lcd.init();
  lcd.backlight();

  sensors.begin();

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  timer.setInterval(2000L, sendData);
}

/************* LOOP *************/
void loop() {
  Blynk.run();
  timer.run();
}