#define BLYNK_TEMPLATE_ID "TMPL3kJCwuEoB"
#define BLYNK_TEMPLATE_NAME "smart soil nutrition monitoring system"
#define BLYNK_AUTH_TOKEN "NhdFWHg8xudMydNPjYzf6s5zMkDkk4I5"
#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Replace with your Blynk auth token
char auth[] = "NhdFWHg8xudMydNPjYzf6s5zMkDkk4I5";

// Replace with your Wi-Fi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// DHT Sensor settings
#define DHTPIN 4 // Pin where the DHT sensor is connected
#define DHTTYPE DHT22 // DHT 22 (you can also use DHT11)
DHT dht(DHTPIN, DHTTYPE);

// Soil moisture sensor pin (simulated by potentiometer)
int soilMoisturePin = 34;

// Variables to store sensor values
double temperature;
double humidity;
int soilMoistureValue;

void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);
  dht.begin();
  pinMode(soilMoisturePin, INPUT);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  delay(2000);
  display.display();
  delay(2000);
  display.clearDisplay();
}

void loop() {
  Blynk.run();

  // Reading temperature and humidity
  temperature = (double)dht.readTemperature();
  humidity = (double)dht.readHumidity();

  // Reading soil moisture (simulated by potentiometer)
  int sensorValue = analogRead(soilMoisturePin);
  Serial.print("Raw Soil Moisture Value: ");
  Serial.println(sensorValue);

  // Map raw sensor value to percentage (0-100%)
  soilMoistureValue = map(sensorValue, 0, 4095, 0, 100); 

  // Ensure the mapping is correct, adjust if necessary
  soilMoistureValue = constrain(soilMoistureValue, 0, 100); // Ensure value is within 0-100%

  // Sending sensor data to Blynk
  Blynk.virtualWrite(V1, temperature);
  Blynk.virtualWrite(V2, humidity);
  Blynk.virtualWrite(V3, soilMoistureValue);

  // Printing values to Serial Monitor for debugging
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.print(" %, Soil Moisture: ");
  Serial.print(soilMoistureValue);
  Serial.println(" %");

  // Display sensor data on OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Temperature:");
  display.print(temperature);
  display.println(" C");
  display.println("Humidity:");
  display.print(humidity);
  display.println(" %");
  display.println("Soil Moisture:");
  display.print(soilMoistureValue);
  display.println(" %");
  display.display();

  delay(2000); // Wait for 2 seconds before the next loop
}