#define BLYNK_TEMPLATE_ID "TMPL3pJG9SqIb"
#define BLYNK_TEMPLATE_NAME "air "
#define BLYNK_AUTH_TOKEN "Your Auth Token"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include <driver/gpio.h>
#include <driver/adc.h>
#include <esp_adc_cal.h>
#include <dht.h> // Assuming you have a DHT library for ESP-IDF

// --- Configuration ---
#define DHT_PIN 2
#define MQ2_PIN ADC1_CHANNEL_7 // GPIO35 is ADC1 channel 7 (adjust if needed)
#define ADC_VREF 3.3f          // Voltage reference of ESP32 ADC
#define ADC_BITS 12             // Resolution of ESP32 ADC (usually 12-bit)
#define THRESHOLD 30000         // Example threshold (will need adjustment for ESP32 ADC)

// --- Global Variables ---
static esp_adc_cal_characteristics_t adc_chars;

// --- Function to initialize ADC ---
void init_adc() {
    // Configure ADC
    adc1_config_width(ADC_WIDTH_BIT_12);
    adc1_config_channel_atten(MQ2_PIN, ADC_ATTEN_DB_11); // Adjust attenuation as needed

    // Characterize ADC
    esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, 1100, &adc_chars); // 1100 mV typical VRef
}

int main(void) {
    // Initialize DHT sensor
    gpio_set_direction(DHT_PIN, GPIO_MODE_INPUT_OUTPUT); // Set as output initially for init
    if (dht_init(DHT_PIN, DHT_TYPE_DHT22) != ESP_OK) {
        printf("DHT22 initialization failed!\n");
        return 1;
    }

    // Initialize ADC
    init_adc();

    while (1) {
        float temperature = NAN;
        float humidity = NAN;

        // Read DHT22 sensor
        if (dht_read_float(&humidity, &temperature) == ESP_OK) {
            float temperature_fahrenheit = (temperature * 9.0 / 5.0) + 32.0;
            printf("--- Sensor Readings ---\n");
            printf("Temperature: %.1f C (%.1f F)\n", temperature, temperature_fahrenheit);
            printf("Humidity: %.1f %%\n", humidity);
        } else {
            printf("Error reading DHT22 sensor\n");
        }

        // Read MQ2 gas sensor
        uint32_t adc_reading = adc1_get_raw(MQ2_PIN);
        float voltage = esp_adc_cal_raw_to_voltage(adc_reading, &adc_chars) / 1000.0f; // Convert mV to V

        printf("ADC Reading: %u, Voltage: %.2f V\n", adc_reading, voltage);

        // Adjust the threshold for the ESP32 ADC reading
        // The raw ADC reading will be between 0 and 4095 (for 12-bit resolution).
        // You'll need to determine an appropriate threshold based on your sensor's output.
        uint32_t esp32_threshold = (uint32_t)((THRESHOLD / 65535.0) * pow(2, ADC_BITS)); // Scale the Python threshold

        if (adc_reading > esp32_threshold) {
            printf("Gas detected!\n");
        } else {
            printf("No gas detected.\n");
        }

        sleep(2); // Delay for 2 seconds
    }

    return 0;
}