#define BLYNK_TEMPLATE_ID "TMPL3grG9nPT7"
#define BLYNK_TEMPLATE_NAME "soil moisture and npk"
#define BLYNK_AUTH_TOKEN "gFxZ4mVCpGZFPmfDFYFFeOtDOb9_5hxY"

#define ledpin 26
#define BUZZER_PIN 27


#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Potentiometer is connected to GPIO 34 (Analog ADC1_CH6)
const int potPin = 34;
// variable for storing the potentiometer value
int potValue = 0;

#define ncom 3 // number of commands
char commar[ncom] = {0x1, 0x3, 0x5}; // Actual commands
// Response Strings can be stored like this
char respar[ncom][30] = {"Potassium value is: ", "Nitrogen value is: ", "Phosphorous value is: "};
uint8_t rtValue[ncom]; // Store the return values from the custom chip in here


LiquidCrystal_I2C lcd(0x27, 20, 4); 


void beepBuzzer(int frequency, int duration, int repeat) {
  // Function to produce beeping sounds
  for (int i = 0; i < repeat; i++) {
    tone(BUZZER_PIN, frequency, duration);
    delay(300); // Delay between consecutive beeps
  }
  delay(2000); // Delay after the entire sequence
}


void setup() {
  Serial.begin(115200);
  Serial2.begin(15200, SERIAL_8N1, 16, 17); // Initialize the custom chip communication line

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  Serial.println("Hello, ESP32!");


  pinMode(ledpin, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  lcd.init();         // initialize the lcd
  lcd.backlight(); // Turn on the LCD screen backlight
}

void loop() {
  // Reading potentiometer value
  potValue = analogRead(potPin);
  Serial.println("Moisture: " + String(potValue));
   

  for (uint8_t i = 0; i < ncom; i++) {
    Serial2.print((char)commar[i]); // Send the command stored in commar array through serial2
    if (Serial2.available()) { // If serial2 data is there
      rtValue[i] = Serial2.read(); // Read serial2
      Serial2.flush(); // Flush serial2, very important to avoid extra bits interference
      Serial.print(respar[i]); // Print the response array to the console
      Serial.println(rtValue[i]); // Print the return value with newline at console
    }
      delay(3000);
  }
  if ((potValue < 20) && (rtValue[0] < 10 || rtValue[1] < 10 || rtValue[2] < 10)){
    digitalWrite(ledpin, HIGH);
    beepBuzzer(3000, 1000, 3);
    Blynk.virtualWrite(V4, HIGH);
   }
   else{
    digitalWrite(ledpin, LOW);
    beepBuzzer(0,0,0);
    Blynk.virtualWrite(V4, LOW);
   }


  lcd.setCursor(0,0);
  lcd.print("Moisture : ");
  lcd.print(potValue);
  lcd.setCursor(0,1);
  lcd.print("Nitrogen : ");
  lcd.print(rtValue[1]);
  lcd.setCursor(0,2);
  lcd.print("Phosphorous : ");
  lcd.print(rtValue[2]);
  lcd.setCursor(0,3);
  lcd.print("Potassium : ");
  lcd.print(rtValue[0]);





  Blynk.virtualWrite(V0, potValue); // Moisture value
  Blynk.virtualWrite(V1, rtValue[1]); // Nitrogen value
  Blynk.virtualWrite(V2, rtValue[2]); // Phosphorous value
  Blynk.virtualWrite(V3, rtValue[0]); // Potassium value

  Blynk.run();
}