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#define BLYNK_TEMPLATE_ID "TMPL6cET3uP7Q"
#define BLYNK_TEMPLATE_NAME "Peltier Air Cooler"
#define BLYNK_AUTH_TOKEN "NTslalQqGkKcpXjvCp3nmgQRfV_hPZGh"

#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>
#define ROOM_DHTPIN 14     // Digital pin connected to the room DHT sensor
#define OUTPUT_DHTPIN 13   // Digital pin connected to the output DHT sensor
#define IN1_PIN 33         // Digital pin connected to IN1 on L298N

// Uncomment whatever type you're using!
#define DHTTYPE DHT11   // DHT 11
//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)
#define FAN_PIN 32      // FAN PWM PIN

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Town House";
char pass[] = "dizon777";

float roomTemp = 0;
float outputTemp = 0;

// Initialize DHT sensors.
DHT roomDht(ROOM_DHTPIN, DHTTYPE);
DHT outputDht(OUTPUT_DHTPIN, DHTTYPE);

bool fanEnabled = false;

BLYNK_WRITE(V3) {
  fanEnabled = param.asInt(); // Get value from the Blynk switch widget
}

void setup() {
  Serial.begin(115200);
  pinMode(FAN_PIN, OUTPUT);
  pinMode(IN1_PIN, OUTPUT); // Set IN1 pin as output
  digitalWrite(IN1_PIN, LOW); // Initially keep IN1 pin low
  analogWrite(FAN_PIN, 0); // Initialize fan speed to 0
  Serial.println(F("DHTxx test!"));
  roomDht.begin();
  outputDht.begin();
  Blynk.begin(auth, ssid, pass);
}

void loop() {
  Blynk.run();

  // Wait a few seconds between measurements.
  delay(2000);

  // Read temperature from both sensors
  roomTemp = roomDht.readTemperature();
  outputTemp = outputDht.readTemperature();

  // Check if any reads failed and exit early (to try again).
  if (isnan(roomTemp) || isnan(outputTemp)) {
    Serial.println("Failed to read from one of the DHT sensors!");
    return;
  }

  Serial.print(F("Room Temperature: "));
  Serial.print(roomTemp);
  Serial.print(F("°C "));
  Serial.println();
  Serial.print(F("Output Temperature: "));
  Serial.print(outputTemp);
  Serial.print(F("°C "));
  Serial.println();
  
  Serial.println("*********************");
  Serial.println();

  // Adjust fan speed based on temperature reading only if fan is enabled
  if (fanEnabled) {
    int fanSpeed = 0; // Initialize fan speed to 0

    if (roomTemp <= 15) {
      fanSpeed = 0; // Fan off
    } else if (roomTemp > 15 && roomTemp <= 20) {
      fanSpeed = 150; // Low speed
    } else if (roomTemp > 20 && roomTemp <= 25) {
      fanSpeed = 170; // Medium speed
    } else if (roomTemp > 25) {
      fanSpeed = 255; // High speed
    }

    analogWrite(FAN_PIN, fanSpeed); // Set the fan speed using PWM
    digitalWrite(IN1_PIN, HIGH); // Set IN1 high to enable the Peltier module
  } else {
    analogWrite(FAN_PIN, 0); // Turn off the fan if not enabled
    digitalWrite(IN1_PIN, LOW); // Set IN1 low to disable the Peltier module
  }

  Blynk.virtualWrite(V1, roomTemp);
  Blynk.virtualWrite(V2, outputTemp);
}