diff --git a/CMakeLists.txt b/CMakeLists.txt
old mode 100644
new mode 100755
index 9ab5c51..f210d1a
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1 +1 @@
-idf_component_register(SRCS "main.c" INCLUDE_DIRS "include")
\ No newline at end of file
+idf_component_register(SRCS "zh_htu.c" INCLUDE_DIRS "include" REQUIRES driver)
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
old mode 100644
new mode 100755
diff --git a/README.md b/README.md
old mode 100644
new mode 100755
index 3df3e4d..d5a8f16
--- a/README.md
+++ b/README.md
@@ -1,3 +1,76 @@
-# esp_component_template
+# ESP32 ESP-IDF and ESP8266 RTOS SDK component for HTU20/HTU21 humidity & temperature sensor
 
-esp_component_template
\ No newline at end of file
+## Tested on
+
+1. ESP8266 RTOS_SDK v3.4
+2. ESP32 ESP-IDF v5.2
+
+## Using
+
+In an existing project, run the following command to install the component:
+
+```text
+cd ../your_project/components
+git clone https://github.com/aZholtikov/zh_htu.git
+```
+
+In the application, add the component:
+
+```c
+#include "zh_htu.h"
+```
+
+## Example
+
+Reading the sensor:
+
+```c
+#include "zh_aht.h"
+
+#define I2C_PORT (I2C_NUM_MAX - 1)
+
+void app_main(void)
+{
+    esp_log_level_set("zh_aht", ESP_LOG_NONE);
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    i2c_config_t i2c_config = {
+        .mode = I2C_MODE_MASTER,
+        .sda_io_num = GPIO_NUM_4, // In accordance with used chip.
+        .sda_pullup_en = GPIO_PULLUP_ENABLE,
+        .scl_io_num = GPIO_NUM_5, // In accordance with used chip.
+        .scl_pullup_en = GPIO_PULLUP_ENABLE,
+    };
+    i2c_driver_install(I2C_PORT, i2c_config.mode);
+    i2c_param_config(I2C_PORT, &i2c_config);
+#else
+    i2c_master_bus_config_t i2c_bus_config = {
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .i2c_port = I2C_PORT,
+        .scl_io_num = GPIO_NUM_22, // In accordance with used chip.
+        .sda_io_num = GPIO_NUM_21, // In accordance with used chip.
+        .glitch_ignore_cnt = 7,
+        .flags.enable_internal_pullup = true,
+    };
+    i2c_master_bus_handle_t i2c_bus_handle;
+    i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle);
+#endif
+    zh_aht_init_config_t aht_init_config = ZH_AHT_INIT_CONFIG_DEFAULT();
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    aht_init_config.i2c_port = I2C_PORT;
+#else
+    aht_init_config.i2c_handle = i2c_bus_handle;
+#endif
+    zh_aht_init(&aht_init_config);
+    float humidity = 0.0;
+    float temperature = 0.0;
+    for (;;)
+    {
+        zh_aht_read(&humidity, &temperature);
+        printf("Humidity %0.2f\n", humidity);
+        printf("Temperature %0.2f\n", temperature);
+        vTaskDelay(5000 / portTICK_PERIOD_MS);
+    }
+}
+```
+
+Any [feedback](mailto:github@azholtikov.ru) will be gladly accepted.
diff --git a/component.mk b/component.mk
old mode 100644
new mode 100755
diff --git a/include/main.h b/include/main.h
deleted file mode 100644
index e69de29..0000000
diff --git a/include/zh_htu.h b/include/zh_htu.h
new file mode 100755
index 0000000..209e394
--- /dev/null
+++ b/include/zh_htu.h
@@ -0,0 +1,88 @@
+#pragma once
+
+#include "esp_err.h"
+#include "esp_log.h"
+#ifdef CONFIG_IDF_TARGET_ESP8266
+#include "driver/i2c.h"
+#else
+#include "driver/i2c_master.h"
+#endif
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#define ZH_HTU_INIT_CONFIG_DEFAULT() \
+    {                                \
+        .i2c_port = 0,               \
+        .resolution = HTU_RES_12_14  \
+    }
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    typedef enum
+    {
+        HTU_RES_8_12 = 0x1,   // 8 bit humidity resolution / 12 bit temperature resolution.
+        HTU_RES_10_13 = 0x40, // 10 bit humidity resolution / 13 bit temperature resolution.
+        HTU_RES_11_11 = 0x41, // 11 bit humidity resolution / 11 bit temperature resolution.
+        HTU_RES_12_14 = 0x0   // 12 bit humidity resolution / 14 bit temperature resolution.
+    } zh_htu_resolution_t;
+
+    typedef struct // Structure for initial initialization of AHT sensor.
+    {
+        bool i2c_port;                  // I2C port.
+        zh_htu_resolution_t resolution; // Sensor measurement resolution.
+#ifndef CONFIG_IDF_TARGET_ESP8266
+        i2c_master_bus_handle_t i2c_handle; // Unique I2C bus handle.
+#endif
+    } zh_htu_init_config_t;
+
+    /**
+     * @brief Initialize HTU sensor.
+     *
+     * @param[in] config Pointer to HTU initialized configuration structure. Can point to a temporary variable.
+     *
+     * @attention I2C driver must be initialized first.
+     *
+     * @note Before initialize the sensor recommend initialize zh_htu_init_config_t structure with default values.
+     *
+     * @code zh_htu_init_config_t config = ZH_HTU_INIT_CONFIG_DEFAULT() @endcode
+     *
+     * @return
+     *              - ESP_OK if initialization was success
+     *              - ESP_ERR_INVALID_ARG if parameter error
+     *              - ESP_ERR_NOT_FOUND if sensor not connected or not responded
+     *              - ESP_ERR_INVALID_RESPONSE if I2C driver error
+     */
+    esp_err_t zh_htu_init(const zh_htu_init_config_t *config);
+
+    /**
+     * @brief Read HTU sensor.
+     *
+     * @param[out] humidity Pointer for HTU sensor reading data of humidity.
+     * @param[out] temperature Pointer for HTU sensor reading data of temperature.
+     *
+     * @return
+     *              - ESP_OK if read was success
+     *              - ESP_ERR_INVALID_ARG if parameter error
+     *              - ESP_ERR_NOT_FOUND if sensor is not initialized
+     *              - ESP_ERR_INVALID_CRC if check CRC is fail
+     *              - ESP_ERR_INVALID_RESPONSE if I2C driver error
+     *              - ESP_ERR_TIMEOUT if sensor has not responded
+     */
+    esp_err_t zh_htu_read(float *humidity, float *temperature);
+
+    /**
+     * @brief Reset HTU sensor.
+     *
+     * @return
+     *              - ESP_OK if reset was success
+     *              - ESP_ERR_NOT_FOUND if sensor is not initialized
+     *              - ESP_ERR_INVALID_RESPONSE if I2C driver error
+     */
+    esp_err_t zh_htu_reset(void);
+
+#ifdef __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/version.txt b/version.txt
old mode 100644
new mode 100755
index e69de29..7f20734
--- a/version.txt
+++ b/version.txt
@@ -0,0 +1 @@
+1.0.1
\ No newline at end of file
diff --git a/zh_htu.c b/zh_htu.c
new file mode 100755
index 0000000..8be9830
--- /dev/null
+++ b/zh_htu.c
@@ -0,0 +1,229 @@
+#include "zh_htu.h"
+
+#define I2C_DATA_SIZE 3                        // Sensor data size (in bytes).
+#define TEMPERATURE_MEASUREMENT_TIME 50        // Sensor temperature measurement time (in milliseconds).
+#define HUMIDITY_MEASUREMENT_TIME 20           // Sensor humidity measurement time (in milliseconds).
+#define RESET_TIME 20                          // Sensor reset time (in milliseconds).
+#define I2C_ADDRESS 0x40                       // Sensor I2C address.
+#define I2C_TEMPERATURE_DATA_READ_COMMAND 0xF3 // Command for read sensor temperature data.
+#define I2C_HUMIDITY_DATA_READ_COMMAND 0xF5    // Command for read sensor humidity data.
+#define I2C_RESET_COMMAND 0xFE                 // Command for reset sensor.
+#define I2C_REGISTER_READ_COMMAND 0xE7         // Command for read sensor register.
+#define I2C_REGISTER_WRITE_COMMAND 0xE6        // Command for write sensor register.
+
+static zh_htu_init_config_t _init_config = {0};
+static bool _is_initialized = false;
+#ifndef CONFIG_IDF_TARGET_ESP8266
+static i2c_master_dev_handle_t _htu_handle = {0};
+#endif
+
+static const char *TAG = "zh_htu";
+
+static uint8_t _calc_crc(const uint8_t *buf, size_t len);
+
+esp_err_t zh_htu_init(const zh_htu_init_config_t *config)
+{
+    ESP_LOGI(TAG, "HTU initialization begin.");
+    if (config == NULL)
+    {
+        ESP_LOGE(TAG, "HTU initialization fail. Invalid argument.");
+        return ESP_ERR_INVALID_ARG;
+    }
+    _init_config = *config;
+#ifndef CONFIG_IDF_TARGET_ESP8266
+    i2c_device_config_t htu_config = {
+        .dev_addr_length = I2C_ADDR_BIT_LEN_7,
+        .device_address = I2C_ADDRESS,
+        .scl_speed_hz = 100000,
+    };
+    i2c_master_bus_add_device(_init_config.i2c_handle, &htu_config, &_htu_handle);
+    if (i2c_master_probe(_init_config.i2c_handle, I2C_ADDRESS, 1000 / portTICK_PERIOD_MS) != ESP_OK)
+    {
+        ESP_LOGE(TAG, "HTU initialization fail. Sensor not connected or not responded.");
+        return ESP_ERR_NOT_FOUND;
+    }
+#endif
+    esp_err_t esp_err = ESP_OK;
+    uint8_t command = I2C_STATUS_READ_COMMAND;
+    uint8_t sensor_data = 0;
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
+    i2c_master_start(i2c_cmd_handle);
+    i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_WRITE, true);
+    i2c_master_write_byte(i2c_cmd_handle, command, true);
+    i2c_master_stop(i2c_cmd_handle);
+    esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
+    i2c_cmd_link_delete(i2c_cmd_handle);
+#else
+    esp_err = i2c_master_transmit(_htu_handle, &command, sizeof(command), 1000 / portTICK_PERIOD_MS);
+#endif
+    if (esp_err != ESP_OK)
+    {
+        ESP_LOGE(TAG, "HTU initialization fail. I2C driver error at line %d.", __LINE__);
+        return ESP_ERR_INVALID_RESPONSE;
+    }
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    i2c_cmd_handle = i2c_cmd_link_create();
+    i2c_master_start(i2c_cmd_handle);
+    i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_READ, true);
+    i2c_master_read_byte(i2c_cmd_handle, &sensor_data, I2C_MASTER_NACK);
+    i2c_master_stop(i2c_cmd_handle);
+    esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
+    i2c_cmd_link_delete(i2c_cmd_handle);
+#else
+    esp_err = i2c_master_receive(_htu_handle, &sensor_data, sizeof(sensor_data), 1000 / portTICK_PERIOD_MS);
+#endif
+    if (esp_err != ESP_OK)
+    {
+        ESP_LOGE(TAG, "HTU initialization fail. I2C driver error at line %d.", __LINE__);
+        return ESP_ERR_INVALID_RESPONSE;
+    }
+    if ((sensor_data & 0b00001000) == 0)
+    {
+        uint8_t command[] = {I2C_INIT_COMMAND};
+#ifdef CONFIG_IDF_TARGET_ESP8266
+        i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
+        i2c_master_start(i2c_cmd_handle);
+        i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_WRITE, true);
+        i2c_master_write_byte(i2c_cmd_handle, command[0], true);
+        i2c_master_write_byte(i2c_cmd_handle, command[1], true);
+        i2c_master_write_byte(i2c_cmd_handle, command[2], true);
+        i2c_master_stop(i2c_cmd_handle);
+        esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
+        i2c_cmd_link_delete(i2c_cmd_handle);
+#else
+        esp_err = i2c_master_transmit(_htu_handle, command, sizeof(command), 1000 / portTICK_PERIOD_MS);
+#endif
+        if (esp_err != ESP_OK)
+        {
+            ESP_LOGE(TAG, "HTU initialization fail. I2C driver error at line %d.", __LINE__);
+            return ESP_ERR_INVALID_RESPONSE;
+        }
+    }
+    ESP_LOGI(TAG, "HTU initialization success.");
+    _is_initialized = true;
+    return ESP_OK;
+}
+
+esp_err_t zh_htu_read(float *humidity, float *temperature)
+{
+    ESP_LOGI(TAG, "HTU read begin.");
+    if (humidity == NULL || temperature == NULL)
+    {
+        ESP_LOGE(TAG, "HTU read fail. Invalid argument.");
+        return ESP_ERR_INVALID_ARG;
+    }
+    if (_is_initialized == false)
+    {
+        ESP_LOGE(TAG, "HTU read fail. HTU not initialized.");
+        return ESP_ERR_NOT_FOUND;
+    }
+    esp_err_t esp_err = ESP_OK;
+    uint8_t sensor_data[I2C_DATA_SIZE] = {0};
+    uint8_t command[] = {I2C_DATA_READ_COMMAND};
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
+    i2c_master_start(i2c_cmd_handle);
+    i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_WRITE, true);
+    i2c_master_write_byte(i2c_cmd_handle, command[0], true);
+    i2c_master_write_byte(i2c_cmd_handle, command[1], true);
+    i2c_master_write_byte(i2c_cmd_handle, command[2], true);
+    i2c_master_stop(i2c_cmd_handle);
+    esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
+    i2c_cmd_link_delete(i2c_cmd_handle);
+#else
+    esp_err = i2c_master_transmit(_htu_handle, command, sizeof(command), 1000 / portTICK_PERIOD_MS);
+#endif
+    if (esp_err != ESP_OK)
+    {
+        ESP_LOGE(TAG, "HTU read fail. I2C driver error at line %d.", __LINE__);
+        return ESP_ERR_INVALID_RESPONSE;
+    }
+    // vTaskDelay(MEASUREMENT_TIME / portTICK_PERIOD_MS);
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    i2c_cmd_handle = i2c_cmd_link_create();
+    i2c_master_start(i2c_cmd_handle);
+    i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_READ, true);
+    for (uint8_t i = 0; i < sizeof(sensor_data); ++i)
+    {
+        i2c_master_read_byte(i2c_cmd_handle, &sensor_data[i], i == (sizeof(sensor_data) - 1) ? I2C_MASTER_NACK : I2C_MASTER_ACK);
+    }
+    i2c_master_stop(i2c_cmd_handle);
+    esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
+    i2c_cmd_link_delete(i2c_cmd_handle);
+#else
+    esp_err = i2c_master_receive(_htu_handle, sensor_data, sizeof(sensor_data), 1000 / portTICK_PERIOD_MS);
+#endif
+    if (esp_err != ESP_OK)
+    {
+        ESP_LOGE(TAG, "HTU read fail. I2C driver error at line %d.", __LINE__);
+        return ESP_ERR_INVALID_RESPONSE;
+    }
+    if ((sensor_data[0] & 0b01000000) != 0)
+    {
+        ESP_LOGE(TAG, "HTU read fail. Timeout exceeded.");
+        return ESP_ERR_TIMEOUT;
+    }
+    if (_calc_crc(sensor_data, I2C_DATA_SIZE - 1) != sensor_data[6])
+    {
+        ESP_LOGE(TAG, "HTU read fail. Invalid CRC.");
+        return ESP_ERR_INVALID_CRC;
+    }
+    *humidity = (((((uint32_t)sensor_data[1]) << 16) | (((uint32_t)sensor_data[2]) << 8) | (((uint32_t)sensor_data[3]) << 0)) >> 4) / 1048576.0 * 100.0;
+    *temperature = (((((uint32_t)sensor_data[3]) << 16) | (((uint32_t)sensor_data[4]) << 8) | (((uint32_t)sensor_data[5]) << 0)) & 0xFFFFF) / 1048576.0 * 200.0 - 50.0;
+    ESP_LOGI(TAG, "HTU read success.");
+    return ESP_OK;
+}
+
+esp_err_t zh_htu_reset(void)
+{
+    ESP_LOGI(TAG, "HTU reset begin.");
+    if (_is_initialized == false)
+    {
+        ESP_LOGE(TAG, "HTU reset fail. HTU not initialized.");
+        return ESP_ERR_NOT_FOUND;
+    }
+    esp_err_t esp_err = ESP_OK;
+    uint8_t command = I2C_RESET_COMMAND;
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
+    i2c_master_start(i2c_cmd_handle);
+    i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_WRITE, true);
+    i2c_master_write_byte(i2c_cmd_handle, command, true);
+    i2c_master_stop(i2c_cmd_handle);
+    esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
+    i2c_cmd_link_delete(i2c_cmd_handle);
+#else
+    esp_err = i2c_master_transmit(_htu_handle, &command, sizeof(command), 1000 / portTICK_PERIOD_MS);
+#endif
+    if (esp_err != ESP_OK)
+    {
+        ESP_LOGE(TAG, "HTU reset fail. I2C driver error at line %d.", __LINE__);
+        return ESP_ERR_INVALID_RESPONSE;
+    }
+    vTaskDelay(RESET_TIME / portTICK_PERIOD_MS);
+    // Write user register.
+    ESP_LOGI(TAG, "HTU reset success.");
+    return ESP_OK;
+}
+
+static uint8_t _calc_crc(const uint8_t *buf, size_t len)
+{
+    uint8_t crc = 0xFF;
+    for (uint8_t byte = 0; byte < len; byte++)
+    {
+        crc ^= buf[byte];
+        for (uint8_t i = 8; i > 0; --i)
+        {
+            if ((crc & 0x80) != 0)
+            {
+                crc = (crc << 1) ^ 0x31;
+            }
+            else
+            {
+                crc = crc << 1;
+            }
+        }
+    }
+    return crc;
+}
\ No newline at end of file