#define BLYNK_AUTH_TOKEN "rctDfVwCBZ7PERy8wMtJPRZivww5Zx7W"
#define BLYNK_TEMPLATE_ID "TMPL3tEgZbd6z"
#define BLYNK_TEMPLATE_NAME "CROP NUTRITION MONITORING IOT"

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "DHTesp.h"

#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 
#define OLED_RESET -1   
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

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

const int DHT_PIN = 27;
DHTesp dhtSensor;

const int pHSensorPin = 32;
const float acidVoltage = 2032.44;  
const float neutralVoltage = 1500.0; 

 
const int potPin = 34;


int potValue = 0;

#define ncom 3 
char commar[ncom] = {0x1, 0x3, 0x5}; 
char respar[ncom][30] = {"Phosphorous value is: ", "Potassium value is: ", "Nitrogen value is: "};
uint8_t rtValue[ncom]; 

BlynkTimer timer;

void displayTitle();
void displayTeamMembers();
void displayAllSensorReadings(unsigned long duration);
void displayThankYou();
void sendData();

void setup() {

  Serial.begin(115200);
  Serial2.begin(15200, SERIAL_8N1, 16, 17); 
  Serial.println("Connecting to Blynk...");
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass); 
  while (!Blynk.connected()) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("");
  Serial.println("Blynk connected.");

  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  timer.setInterval(200L, sendData); 

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

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();                    
  display.display();                         


  displayTitle();
  delay(5000);

  displayTeamMembers();
  delay(5000);

  displayAllSensorReadings(10000);

  displayThankYou();
}

void displayTitle() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 10);
  display.println("CROP NUTRITION MONITORING IOT");
  display.println("System Using IoT");
  display.display();
}

void displayTeamMembers() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 10);
  display.println("Team Members:");
  display.println("Lingeswaran B");
  display.println("Krishna M");
  display.println("Mukesh D");
  display.println("Udhaya Kumar S");
  display.println("Venkatesh S");
  display.display();
}

void displayAllSensorReadings(unsigned long duration) {
  float h = dhtSensor.getHumidity();
  float t = dhtSensor.getTemperature();
  int potValue = analogRead(potPin);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 10);
  display.println("All Sensor Readings:");
  display.print("Temperature: ");
  display.println(t, 2);
  display.print("Humidity: ");
  display.println(h, 2);
  display.print("Soil Moisture: ");
  display.println(potValue);
  display.display();
  delay(duration);
}

void displayThankYou() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 20);
  display.println("Thank you!");
  display.display();
}

void sendData() {
  float t = dhtSensor.getTemperature();
  float h = dhtSensor.getHumidity();
  
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print("%\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.println(" °C");

  int analogValue = analogRead(pHSensorPin);

  float voltage = analogValue * (3.3 / 4095.0); 


  float pHValue = (voltage * 14.0) / 3.3; 
  potValue = analogRead(potPin);
  Serial.println("Moisture: " + String(potValue));
  Serial.print("pH Value: ");
  Serial.println(pHValue, 1);

  for (uint8_t i = 0; i < ncom; i++) {
    Serial2.print((char)commar[i]); 
    if (Serial2.available()) { 
      rtValue[i] = Serial2.read();  
      Serial2.flush(); 
      Serial.print(respar[i]); 
      Serial.println(rtValue[i]); 
  }

  //send data to blynk
  Blynk.virtualWrite(V0, t); 
  Blynk.virtualWrite(V1, h); 
  Blynk.virtualWrite(V2, potValue);
  Blynk.virtualWrite(V4, rtValue[0]);
  Blynk.virtualWrite(V3, rtValue[2]); 
  Blynk.virtualWrite(V5, rtValue[1]); 
}

void loop() {
  Blynk.run();
  timer.run();
  
}