FridgeSensor/main/main.c

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "sdkconfig.h"

/* Use project configuration menu (idf.py menuconfig) to choose the GPIO to blink,
   or you can edit the following line and set a number here.
*/
#define BLINK_GPIO CONFIG_BLINK_GPIO
#define PHOTO_SENSOR_PIN GPIO_NUM_18

static void configure_led(void)
{
    ESP_LOGI("LED", "Example configured to blink GPIO LED!");
    gpio_reset_pin(BLINK_GPIO);
    /* Set the GPIO as a push/pull output */
    gpio_set_direction(BLINK_GPIO, GPIO_MODE_OUTPUT);
}

// GPIO setup
void setup_photo_sensor() {
    gpio_config_t io_conf = {
        .intr_type = GPIO_INTR_ANYEDGE,  // Trigger on both rising & falling edges
        .pin_bit_mask = (1ULL << PHOTO_SENSOR_PIN),
        .mode = GPIO_MODE_INPUT,
        .pull_up_en = GPIO_PULLUP_DISABLE,  
        .pull_down_en = GPIO_PULLDOWN_DISABLE
    };
    gpio_config(&io_conf);

    ESP_LOGI("PHOTO", "Photomicrosensor configured on GPIO %d", PHOTO_SENSOR_PIN);
}

void read_photo_sensor_task(void *pvParameters) {
    static int prevState = 0;
    while (1) {
        int sensorState = gpio_get_level(PHOTO_SENSOR_PIN);
        if (sensorState != prevState) {
            prevState = sensorState;
            ESP_EARLY_LOGI("PHOTO", "Triggered! State: %d", sensorState);
            if( sensorState == 0 ) {
                gpio_set_level(BLINK_GPIO, 1);
            }
            else {
                gpio_set_level(BLINK_GPIO, 0);
            }
        }
        vTaskDelay(pdMS_TO_TICKS(50)); // Delay 50ms (20 times per second)
    }
}

void app_main(void)
{

    /* Configure the peripheral according to the LED type */
    configure_led();
    setup_photo_sensor();

    xTaskCreate(read_photo_sensor_task, "read_sensor_task", 2048, NULL, 10, NULL);

}