//ESP32 smart irrigation code


#define BLYNK_TEMPLATE_ID    "TMPL6GCpyjb3V"

#define BLYNK_TEMPLATE_NAME  "Irigation System"

#define BLYNK_AUTH_TOKEN     "Rvn8aXkijT3RJXxuNjXjDuJpBTV0j8HV"

#define BLYNK_PRINT Serial


#include <WiFi.h>

#include <BlynkSimpleEsp32.h>

#include "DHT.h"


char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "Wokwi-GUEST";

char pass[] = "";


#define DHTPIN 4

#define DHTTYPE DHT22


DHT dht(DHTPIN, DHTTYPE);

const int soilMoisturePin = 35; // Analog pin for the soil moisture sensor

// const int waterLevelPin = 34;   // Analog pin for the water level sensor


// Constants for soil moisture thresholds

const int SOIL_MOISTURE_LOW = 20;  // Adjusted to match the 0-100 range

const int SOIL_MOISTURE_HIGH = 80; // Adjusted to match the 0-100 range


const int pumpPin = 5;  // Change this to the actual pin connected to the DC pump on ESP32

int pumpState = LOW;    // Initialize pumpState to LOW (off)

int pumpMode = 0;       // 0 for automatic, 1 for manual


int waterLevel = 0;     // Water level indicator value

unsigned long previousMillis = 0;

const unsigned long interval = 1000; // Interval in milliseconds


float mappedSoilMoisture = 0; // Declare mappedSoilMoisture as a global variable


void setup() {

  Serial.begin(115200);

  digitalWrite(pumpPin,LOW);

  pinMode(pumpPin, OUTPUT);

  dht.begin();

  Blynk.begin(auth, ssid, pass);

  Blynk.virtualWrite(V2, LOW);


  Blynk.virtualWrite(V6, LOW); // Initialize the mode button to automatic mode

  Blynk.virtualWrite(V5, LOW); // Initialize the pump button to OFF

  Blynk.virtualWrite(V8, LOW); // Initialize the new feature button to OFF

  delay(3000);


}


BLYNK_WRITE(V4) { // This function is called when the pump button state changes (Manual Control)

  if (pumpMode == 1) { // Check if the mode is manual

    pumpState = param.asInt(); // Read the state of the pump button (0 for OFF, 1 for ON)

    digitalWrite(pumpPin, pumpState); // Turn the pump on or off based on button state

  }

}


BLYNK_WRITE(V1) { // This function is called when the mode button state changes

  pumpMode = param.asInt(); // Read the state of the mode button (0 for automatic, 1 for manual)

}




void loop() {

  Blynk.run();
 


  unsigned long currentMillis = millis();

  

  if (currentMillis - previousMillis >= interval) {

    previousMillis = currentMillis;


    // Read soil moisture or water level based on the flag

    if (pumpMode == 0) {

      int soilSensorValue = analogRead(soilMoisturePin);

      Serial.println(soilSensorValue);

      mappedSoilMoisture = map(soilSensorValue, 1023, 2750, 100, 0); // Update mappedSoilMoisture

      autoControlPump(mappedSoilMoisture); // Automatically control the pump based on soil moisture if in automatic mode

    }

    

    // Read water level

    // waterLevel = analogRead(waterLevelPin);

    // Serial.println(waterLevel);

    // if (waterLevel < 450) {

    //   waterLevel = 0; // Set water level to 0 if below a threshold

    // } else {

    //   waterLevel = map(waterLevel, 1200, 1600, 0, 100); // Map water level to 0-100

    // }

    

    // Read and send sensor data

    readAndSendSensorData();

    Blynk.virtualWrite(V2, waterLevel); // Send water level to Blynk

  }

}


void autoControlPump(float mappedSoilMoisture) {

  if (waterLevel < 30 || waterLevel < 20) {

    // Water level is too low, do not turn on the pump

    pumpState = LOW;

  } else if (mappedSoilMoisture <= SOIL_MOISTURE_LOW) {

    // If soil moisture is below the threshold and water level is okay, turn the pump ON

    pumpState = HIGH;

  } else if (mappedSoilMoisture >= SOIL_MOISTURE_HIGH) {

    // If soil moisture is above the threshold, turn the pump OFF

    pumpState = LOW;

  }


  digitalWrite(pumpPin, pumpState); // Update the pump state

  if (pumpMode == 0) {

    Blynk.virtualWrite(V4, pumpState); // Update the pump button status on Blynk

  }

}



void readAndSendSensorData() {


  float temperature = dht.readTemperature();


  if (!isnan(temperature)) {

    Blynk.virtualWrite(V0, temperature);
 

    Serial.println(temperature);


  } else {

    Serial.println(F("Failed to read from DHT sensor!"));

  }


  if (pumpMode == 0) {

    Blynk.virtualWrite(V3, mappedSoilMoisture); // Update mappedSoilMoisture on Blynk

  }

}