diff --git a/README.md b/README.md
index 1d96504..c6e736c 100644
--- a/README.md
+++ b/README.md
@@ -21,12 +21,12 @@ Part list:
 - U2 DHT22 humidity and temperature sensor
 - U3 EEPROM 24C16
 - U4 ESP8266 NodeMCU
-- U5 RTC DS1207
+- U5 RTC DS1307
 - Y1 Oscillator 32,788 KHz
 
 Parts optional (on I2C)
-- MCP23017 (max 8)
-- PCF8591 (max 8)
+- MCP23017 (max 8 pcs)
+- PCF8591 (max 8 pcs)
 
 ## IDE
 
diff --git a/src/HAL/Init.cpp b/src/HAL/Init.cpp
index 9fc814c..15b3019 100644
--- a/src/HAL/Init.cpp
+++ b/src/HAL/Init.cpp
@@ -1,3 +1,10 @@
+/**
+ * @file Init.cpp
+ * @author by Szymon Markiewicz (https://github.com/InzynierDomu/)
+ * @brief Main HAL run
+ * @date 2022-06
+ */
+
 #include "Init.h"
 
 #include "Analog_controller.h"
diff --git a/src/HAL/Init.h b/src/HAL/Init.h
index 7832690..11df715 100644
--- a/src/HAL/Init.h
+++ b/src/HAL/Init.h
@@ -1,3 +1,10 @@
+/**
+ * @file Init.h
+ * @author by Szymon Markiewicz (https://github.com/InzynierDomu/)
+ * @brief Main HAL run
+ * @date 2022-06
+ */
+
 #pragma once
 
 #include "../Keyboard_buttons.h"
@@ -11,7 +18,6 @@
 #include <optional>
 #include <vector>
 
-
 class Supervisor;
 
 namespace HAL
diff --git a/src/Peripherals/Analog_input.cpp b/src/Peripherals/Analog_input.cpp
index cd09bf5..cadb59d 100644
--- a/src/Peripherals/Analog_input.cpp
+++ b/src/Peripherals/Analog_input.cpp
@@ -1,28 +1,41 @@
+/**
+ * @file Analog_input.cpp
+ * @author by Szymon Markiewicz (https://github.com/InzynierDomu/)
+ * @brief Analog input handling
+ * @date 2022-06
+ */
+
 #include "Analog_input.h"
 
 #include "HAL/Real_clock.h"
 #include "Logger.h"
 
-#include <PubSubClient.h>
-
 namespace Peripherals
 {
 
-Analog_input::Analog_input(HAL::Analog_controller* controller, const int pin, const String topic)
+/**
+ * @brief Construct a new Analog_input::Analog_input object
+ * @param controller: analog expander
+ * @param pin: pin number
+ * @param topic: mqtt topic to publish
+ */
+Analog_input::Analog_input(HAL::Analog_controller* controller, const uint8_t pin, const String& topic)
 : m_controller(controller)
 , m_logger(Logger("Analog input (topic:" + topic + " pin:" + String(pin) + ")", HAL::Real_clock::get_instance()->get_time_callback()))
-{
-  m_pin = pin;
-  m_topic = topic;
-}
+, m_topic(topic)
+, m_pin(pin)
+{}
 
+/**
+ * @brief publish actual analog measurment value on pin
+ * @param client: mqtt client
+ */
 void Analog_input::publish(PubSubClient& client)
 {
   char buf[4];
-  // String topic = m_topic;
   int value = m_controller->get_value(m_pin);
   sprintf(buf, "%d", value);
-  m_logger.log(String(value), Log_type::debug);
+  m_logger.log(String(value));
   client.publish(m_topic.c_str(), buf);
 }
 
diff --git a/src/Peripherals/Analog_input.h b/src/Peripherals/Analog_input.h
index 914de99..ca4b157 100644
--- a/src/Peripherals/Analog_input.h
+++ b/src/Peripherals/Analog_input.h
@@ -1,3 +1,10 @@
+/**
+ * @file Analog_input.h
+ * @author by Szymon Markiewicz (https://github.com/InzynierDomu/)
+ * @brief Analog input handling
+ * @date 2022-06
+ */
+
 #pragma once
 
 #include "HAL/Analog_controller.h"
@@ -11,15 +18,15 @@ namespace Peripherals
 class Analog_input : public Peripheral_input
 {
   public:
-  Analog_input(HAL::Analog_controller* controller, const int pin, const String topic);
+  Analog_input(HAL::Analog_controller* controller, const uint8_t pin, const String& topic);
   void publish(PubSubClient& client) override;
 
   private:
   HAL::Analog_controller* m_controller;
   Logger m_logger;
 
-  String m_topic;
-  uint8_t m_pin;
+  const String& m_topic; ///< mqtt topic to publishing
+  const uint8_t m_pin; ///< pin number on expander
 };
 
 } // namespace Peripherals
\ No newline at end of file
diff --git a/src/Peripherals/Digital_input.cpp b/src/Peripherals/Digital_input.cpp
index f7a07e0..3396d73 100644
--- a/src/Peripherals/Digital_input.cpp
+++ b/src/Peripherals/Digital_input.cpp
@@ -1,3 +1,10 @@
+/**
+ * @file Digital_input.cpp
+ * @author by Szymon Markiewicz (https://github.com/InzynierDomu/)
+ * @brief Digital input handling
+ * @date 2022-06
+ */
+
 #include "Digital_input.h"
 
 #include "HAL/Real_clock.h"
@@ -5,21 +12,28 @@
 namespace Peripherals
 {
 
-Digital_input::Digital_input(HAL::GPIO_controller* controller, int pin, String topic)
+/**
+ * @brief Construct a new Digital_input::Digital_input object
+ * @param controller: GPIO expander
+ * @param pin: pin number
+ * @param topic: mqtt topic to publish
+ */
+Digital_input::Digital_input(HAL::GPIO_controller* controller, const uint8_t pin, const String& topic)
 : m_controller(controller)
 , m_logger(Logger("Digital input (topic:" + topic + " pin:" + String(pin) + ")", HAL::Real_clock::get_instance()->get_time_callback()))
-{
-  m_pin = pin;
-  m_topic = topic;
-}
+, m_topic(topic)
+, m_pin(pin)
+{}
 
+/**
+ * @brief publish actual pin state
+ * @param client: mqtt client
+ */
 void Digital_input::publish(PubSubClient& client)
 {
-  char topic[30];
-  m_topic.toCharArray(topic, 30);
   uint8_t state = m_controller->get_state(m_pin);
   m_logger.log(String(state));
-  client.publish(topic, &state, 1);
+  client.publish(m_topic.c_str(), &state, 1);
 }
 
 } // namespace Peripherals
diff --git a/src/Peripherals/Digital_input.h b/src/Peripherals/Digital_input.h
index 43b8d5b..a43c280 100644
--- a/src/Peripherals/Digital_input.h
+++ b/src/Peripherals/Digital_input.h
@@ -1,3 +1,10 @@
+/**
+ * @file Digital_input.h
+ * @author by Szymon Markiewicz (https://github.com/InzynierDomu/)
+ * @brief Digital input handling
+ * @date 2022-06
+ */
+
 #pragma once
 
 #include "HAL/GPIO_controller.h"
@@ -12,15 +19,15 @@ namespace Peripherals
 class Digital_input : public Peripheral_input
 {
   public:
-  Digital_input(HAL::GPIO_controller* controller, int pin, String topic);
+  Digital_input(HAL::GPIO_controller* controller, const uint8_t pin, const String& topic);
   void publish(PubSubClient& client) override;
 
   private:
   HAL::GPIO_controller* m_controller;
   Logger m_logger;
 
-  String m_topic;
-  uint8_t m_pin;
+  const String& m_topic; ///< mqtt topic to publishing
+  const uint8_t m_pin; ///< pin number on expander
 };
 
 } // namespace Peripherals
\ No newline at end of file
diff --git a/src/Peripherals/Digital_output.cpp b/src/Peripherals/Digital_output.cpp
index 6cb2112..0484f43 100644
--- a/src/Peripherals/Digital_output.cpp
+++ b/src/Peripherals/Digital_output.cpp
@@ -1,3 +1,10 @@
+/**
+ * @file Digital_output.cpp
+ * @author by Szymon Markiewicz (https://github.com/InzynierDomu/)
+ * @brief Digital output handling
+ * @date 2022-06
+ */
+
 #include "Digital_output.h"
 
 #include "HAL/Real_clock.h"
@@ -6,14 +13,22 @@
 namespace Peripherals
 {
 
-Digital_output::Digital_output(HAL::GPIO_controller* controller, PubSubClient& client, int pin, String topic, Scheduler& scheduler)
+/**
+ * @brief Construct a new Digital_output::Digital_output object
+ * @param controller: GPIO expander
+ * @param client: MQTT client
+ * @param pin: pin number
+ * @param topic: mqtt topic to subscribe
+ * @param scheduler: event scheduler
+ */
+Digital_output::Digital_output(HAL::GPIO_controller* controller, PubSubClient& client, const uint8_t pin, const String& topic,
+                               Scheduler& scheduler)
 : m_controller(controller)
 , m_logger(new Logger("Digital output (topic:" + topic + " pin:" + String(pin) + ")", HAL::Real_clock::get_instance()->get_time_callback()))
 , m_scheduler(scheduler)
+, m_topic(topic)
+, m_pin(pin)
 {
-  m_pin = pin;
-  m_topic = topic;
-
   m_controller->set_in_out(OUTPUT, m_pin);
 
   char convert_buf[30];
@@ -21,13 +36,11 @@ Digital_output::Digital_output(HAL::GPIO_controller* controller, PubSubClient& c
   client.subscribe(convert_buf);
 }
 
-void Digital_output::turn_off()
-{
-  m_controller->turn_off_pin(m_pin);
-  m_logger->log("turn off");
-}
-
-void Digital_output::set_value(uint8_t value)
+/**
+ * @brief set value on output pin
+ * @param value: turn on, of or turn on for some time
+ */
+void Digital_output::set_value(const uint8_t value)
 {
   if (value < 2)
   {
@@ -50,9 +63,19 @@ void Digital_output::set_value(uint8_t value)
   }
 }
 
-String Digital_output::get_topic()
+/**
+ * @brief get output topic
+ * @return String topic
+ */
+String Digital_output::get_topic() const
 {
   return m_topic;
 }
 
+void Digital_output::turn_off()
+{
+  m_controller->turn_off_pin(m_pin);
+  m_logger->log("turn off");
+}
+
 } // namespace Peripherals
diff --git a/src/Peripherals/Digital_output.h b/src/Peripherals/Digital_output.h
index 82f7eea..795ab56 100644
--- a/src/Peripherals/Digital_output.h
+++ b/src/Peripherals/Digital_output.h
@@ -1,3 +1,10 @@
+/**
+ * @file Digital_output.h
+ * @author by Szymon Markiewicz (https://github.com/InzynierDomu/)
+ * @brief Digital output handling
+ * @date 2022-06
+ */
+
 #pragma once
 
 #include "HAL/GPIO_controller.h"
@@ -15,19 +22,19 @@ namespace Peripherals
 class Digital_output : public Peripheral_output
 {
   public:
-  Digital_output(HAL::GPIO_controller* controller, PubSubClient& client, int pin, String topic, Scheduler& scheduler);
-  void set_value(uint8_t value) override;
-  String get_topic();
+  Digital_output(HAL::GPIO_controller* controller, PubSubClient& client, const uint8_t pin, const String& topic, Scheduler& scheduler);
+  void set_value(const uint8_t value) override;
+  String get_topic() const override;
 
   private:
   void turn_off();
 
   HAL::GPIO_controller* m_controller;
   Logger* m_logger;
-  Scheduler& m_scheduler;  
+  Scheduler& m_scheduler;
 
-  String m_topic;
-  uint8_t m_pin;
+  const String& m_topic; ///< mqtt topic to subscribe
+  const uint8_t m_pin; ///< pin number on expander
 };
 
 } // namespace Peripherals
\ No newline at end of file
diff --git a/src/Peripherals/Peripheral_output.h b/src/Peripherals/Peripheral_output.h
index 84b6b21..f550fd4 100644
--- a/src/Peripherals/Peripheral_output.h
+++ b/src/Peripherals/Peripheral_output.h
@@ -7,8 +7,8 @@ class Peripheral_output
 {
   public:
   virtual ~Peripheral_output() {}
-  virtual void set_value(uint8_t value) = 0;
-  virtual String get_topic() = 0;
+  virtual void set_value(const uint8_t value) = 0;
+  virtual String get_topic() const = 0;
 };
 
 } // namespace Peripherals
\ No newline at end of file
diff --git a/src/Peripherals/Peripherals.h b/src/Peripherals/Peripherals.h
index 8a8db5d..3c3ed73 100644
--- a/src/Peripherals/Peripherals.h
+++ b/src/Peripherals/Peripherals.h
@@ -1,9 +1,8 @@
 /**
  * @file Peripherals.h
- * @brief GreenHouse 2.0 - Peripherals container structure
- * @author Szymon Markiewicz
- * @details http://www.inzynierdomu.pl/
- * @date 06-2022
+ * @brief Peripherals container structure
+ * @author by Szymon Markiewicz (https://github.com/InzynierDomu/)
+ * @date 2022-06
  */
 
 #pragma once
@@ -19,9 +18,14 @@ namespace Peripherals
 
 struct Peripherals
 {
-  std::vector<Peripheral_output*> m_outputs;
-  std::vector<Peripheral_input*> m_inputs;
+  std::vector<Peripheral_output*> m_outputs; ///< outputs peripherals
+  std::vector<Peripheral_input*> m_inputs; ///< inputs peripherals
 
+  /**
+   * @brief Get the output object
+   * @param topic: with what topic want to find output
+   * @return Peripheral_output* output
+   */
   Peripheral_output* get_output(String topic)
   {
     if (!m_outputs.empty())