#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "math.h"
#include "driver/adc.h" //Required for ADC functions. 

void app_main()
{
    adc1_config_width(ADC_WIDTH_BIT_12);  // Set 12-bit ADC resolution (0–4095)

    // GPIO4 is ADC1 channel 3, input voltage up to ~3.3V
    adc1_config_channel_atten(ADC1_CHANNEL_3, ADC_ATTEN_DB_11); 

//Declaring variables and assigning values to them.
    float VRT = 0.0f;
    float T1 = 25 + 273.15;
    float T2;
    float R = 10000.0f;
    float R2 = 10000.0f;
    float B = 3950.0f;
    float RT;
    float celsius;
    
    
    while (1) {
       int adc_value_12bit = adc1_get_raw(ADC1_CHANNEL_3);   // Read raw 12-bit value and store it into a variable.
        VRT = adc_value_12bit * 3.3f / 4095;       // Vref = 3.3V
        RT = R2*VRT/(3.3-VRT);
        T2 = 1 / ((1/T1) + (logf(RT/R)/B));

        celsius = T2 - 273.15; //Calculation to get the value in celsius.
        
        vTaskDelay(pdMS_TO_TICKS(500));    

        printf("\nADC Value: %d | VRT: %.2f | Resistance: %.2fΩ | Current Temperature: %.2f°\n", adc_value_12bit, VRT, RT, celsius);          
    }
}