#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/adc.h"
#include "esp_adc/adc_oneshot.h"
#include "esp_log.h"

#define TAG "LM35"

// ADC channel for GPIO32
#define LM35_ADC_CHANNEL ADC_CHANNEL_4   // GPIO32
#define ADC_UNIT_USED ADC_UNIT_1

void app_main(void)
{
    adc_oneshot_unit_handle_t adc_handle;

    // ADC unit configuration
    adc_oneshot_unit_init_cfg_t init_config = {
        .unit_id = ADC_UNIT_USED,
        .ulp_mode = ADC_ULP_MODE_DISABLE
    };
    adc_oneshot_new_unit(&init_config, &adc_handle);

    // ADC channel configuration
    adc_oneshot_chan_cfg_t channel_config = {
        .bitwidth = ADC_BITWIDTH_12,
        .atten = ADC_ATTEN_DB_11   // allows ~3.3V range
    };
    adc_oneshot_config_channel(adc_handle, LM35_ADC_CHANNEL, &channel_config);

    while (1) {
        int adc_raw = 0;
        adc_oneshot_read(adc_handle, LM35_ADC_CHANNEL, &adc_raw);

        // Convert ADC value to voltage
        float voltage = (adc_raw / 4095.0) * 3.3;

        // LM35 conversion (10mV per °C)
        float temperature = voltage * 100.0;

        ESP_LOGI(TAG, "ADC Raw: %d | Voltage: %.3f V | Temp: %.2f °C",
                 adc_raw, voltage, temperature);

        vTaskDelay(pdMS_TO_TICKS(1000));
    }
}