diff --git a/$ b/$
new file mode 100644
index 0000000..ec0daa0
--- /dev/null
+++ b/$
@@ -0,0 +1,26 @@
+#include "bsl_nucleo_f042k6.hpp"
+
+
+Nucleo_f042k6::Nucleo_f042k6(){}
+Nucleo_f042k6::~Nucleo_f042k6(){}
+
+void Nucleo_f042k6::init()
+{
+	ledPin.init();
+	ledPin.setMode(Pin::mode::output);
+	ledPin.setSpeed(Pin::speed::fast);
+
+	pin_a0.init();
+	pin_a0.setMode(Pin::mode::input);
+	pin_a0.setSpeed(Pin::speed::slow);
+	pin_a0.setPullUpDonw(Pin::pullUpDown::pullDown);
+}
+
+void Nucleo_f042k6::running()
+{
+	ledPin.write(true);
+	delay.ms(200); 
+	ledPin.write(false);
+	delay.ms(200); 
+}
+
diff --git a/bsl/csl/interfaces/pin.hpp b/bsl/csl/interfaces/pin.hpp
index fbf4a49..bd1aaba 100644
--- a/bsl/csl/interfaces/pin.hpp
+++ b/bsl/csl/interfaces/pin.hpp
@@ -77,7 +77,7 @@ class Pin
 		virtual void config(mode mode, state state, pullUpDown resistance, speed speed) = 0; 
 		
 		virtual bool read() = 0;
-		virtual bool toggle() = 0;
+		virtual void toggle() = 0;
 		virtual void write(bool state) = 0;
 
 		virtual void init() = 0;
diff --git a/bsl/csl/stm32f042/Inc/stm_pin.hpp b/bsl/csl/stm32f042/Inc/stm_pin.hpp
index 7fa569a..eba4abc 100644
--- a/bsl/csl/stm32f042/Inc/stm_pin.hpp
+++ b/bsl/csl/stm32f042/Inc/stm_pin.hpp
@@ -66,7 +66,6 @@ enum Pin_no{
 		pin_15
 };
 
-
 template <Pin_no pin_no, GPIO_Port port_base_address>
 class STM_Pin : Pin
 {
@@ -170,7 +169,7 @@ class STM_Pin : Pin
 			 return (reinterpret_cast<GPIO_TypeDef*>(port_base_address)->IDR & (1<<pin_no)) >> pin_no;
 		}
 
-		bool toggle() override
+		void toggle() override
         {
             
         }
diff --git a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp
index 58a00ea..bb7dedc 100644
--- a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp
+++ b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp
@@ -1,42 +1,29 @@
 #include "bsl_nucleo_f042k6.hpp"
-int startBSL() 
+
+
+Nucleo_f042k6::Nucleo_f042k6()
 {
 	stmStart();
-	Delay delay; 
-	
-	STM_Pin<Pin_no::pin_3, GPIO_Port::Port_B_base_address> led;
-	STM_Pin<Pin_no::pin_0, GPIO_Port::Port_A_base_address> pin_a0;
+}
+Nucleo_f042k6::~Nucleo_f042k6(){}
 
-	led.init();
-	led.setMode(Pin::mode::output);
-	led.setSpeed(Pin::speed::fast);
+void Nucleo_f042k6::init()
+{
+	ledPin.init();
+	ledPin.setMode(Pin::mode::output);
+	ledPin.setSpeed(Pin::speed::fast);
 
 	pin_a0.init();
 	pin_a0.setMode(Pin::mode::input);
 	pin_a0.setSpeed(Pin::speed::slow);
 	pin_a0.setPullUpDonw(Pin::pullUpDown::pullDown);
+}
 
-	uint8_t i = 0; 
-
-	for(i = 0 ; i < 10 ; i++)
-	{
-		delay.ms(100); 
-		led.write(true);
-		delay.ms(100); 
-		led.write(false);
-	}	
-
-	while(1)
-	{
-		if(pin_a0.read())
-		{
-			led.write(true);
-		}
-		else 
-		{
-			led.write(false);
-		}
-	}	
-	return 1;
+void Nucleo_f042k6::running()
+{
+		ledPin.write(true);
+		delay.ms(200); 
+		ledPin.write(false);
+		delay.ms(200); 
 }
 
diff --git a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp
index fde38b6..ad00c00 100644
--- a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp
+++ b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp
@@ -5,6 +5,23 @@
 #include "../csl/interfaces/delay.hpp" 
 #include "../csl/stm32f042/Inc/stm_pin.hpp"
 #include "stm32f0xx_csl.h"
-int startBSL(); 
+
+class Nucleo_f042k6
+{		
+	public: 
+
+	Nucleo_f042k6(); 
+	~Nucleo_f042k6(); 
+	
+	void init(); 
+	void running(); 
+	
+	private : 
+	Delay delay; 
+	
+	STM_Pin<Pin_no::pin_3, GPIO_Port::Port_B_base_address> ledPin;
+	STM_Pin<Pin_no::pin_0, GPIO_Port::Port_A_base_address> pin_a0;
+
+}; 
 
 #endif /* BSL_NUCLEO_F042K6_H */
diff --git a/drivers/led/led.cpp b/drivers/led/led.cpp
new file mode 100644
index 0000000..06d11ab
--- /dev/null
+++ b/drivers/led/led.cpp
@@ -0,0 +1,18 @@
+#include "led.hpp"
+
+
+void Pin::on()
+{
+	pin.write(true);
+}
+ 
+void Pin::off()
+{
+	pin.write(false);
+}
+ 
+void Pin::toggle()
+{
+	pin.toggle();
+}
+ 
diff --git a/drivers/led/led.hpp b/drivers/led/led.hpp
new file mode 100644
index 0000000..cba5706
--- /dev/null
+++ b/drivers/led/led.hpp
@@ -0,0 +1,22 @@
+#ifndef __LED_HPP
+#define __LED_HPP
+
+// TODO : Change Cmake to include "pin.hpp"
+#include "../../bsl/csl/interfaces/pin.hpp"
+
+class Led
+{
+	public: 
+	Led(Pin& pin); 
+	~Led(); 
+	
+	void on(); 
+	void off(); 
+	void toggle(); 
+
+	private: 
+	Pin& pin;
+};
+
+
+#endif /* __LED_HPP */
diff --git a/main.cpp b/main.cpp
index 1a9ad86..9f34db6 100644
--- a/main.cpp
+++ b/main.cpp
@@ -3,6 +3,15 @@
 
 int main(int argc, char *argv[])
 {
-	startBSL(); 
+	Nucleo_f042k6 bsl; 
+	
+	bsl.init();
+	while(1)
+	{	
+		bsl.running(); 
+	}
+
 	return 1;
 }
+
+