diff --git a/main.c b/main.c
--- a/main.c
+++ b/main.c
@@ -16,7 +16,7 @@ int main(void)
   STM_EVAL_LEDInit(LED4);
   
   /* Initialize User_Button on STM32L100C-Discovery */
-  STM_EVAL_PBInit(BUTTON_USER, BUTTON_MODE_GPIO);
+  //STM_EVAL_PBInit(BUTTON_USER, BUTTON_MODE_GPIO);
   
   /* SysTick end of count event each 1ms */
   RCC_GetClocksFreq(&RCC_Clocks);
@@ -27,55 +27,25 @@ int main(void)
 
  /* Init lcd driver */
   u8g_t u8g;
-  u8g_InitComFn(&u8g, &u8g_dev_ssd1306_128x64_hw_spi, u8g_com_hw_spi_fn);
+  //u8g_InitComFn(&u8g, &u8g_dev_ssd1306_128x64_hw_spi, u8g_com_hw_spi_fn);
   
+      STM_EVAL_LEDOn(LED4);
+  Delay(1000);
+      STM_EVAL_LEDOff(LED4);
+  Delay(1000);
+
   while(1)
   {  
-    /* Check if the user button is pressed */
-    if(STM_EVAL_PBGetState(BUTTON_USER)== SET)
-    {
-      /* BlinkSpeed: 1 -> 2 -> 0, then re-cycle */
       /* Turn on LD4 Blue LED during 1s each time User button is pressed */
       STM_EVAL_LEDOn(LED4);
+      //STM_EVAL_LEDOn(LED3);
       
       /* wait for 1s */
-      Delay(1000);
+      Delay(300);
       
       /* Turn off LD4 Blue LED after 1s each time User button is pressed */
       STM_EVAL_LEDOff(LED4);
-      
-      /* Increment the blink speed counter */
-      BlinkSpeed++;
-      
-      /* Default value for blink speed counter */
-      if(BlinkSpeed == 3)
-      {  
-        BlinkSpeed = 0;
-      }
-    }
-    
-    /* Test on blink speed */
-    if(BlinkSpeed == 2)
-    {
-      /* LED3 toggles each 100 ms */
-      STM_EVAL_LEDToggle(LED3);
-      
-      /* maintain LED3 status for 100ms */
-      Delay(100);
-    }
-    else if(BlinkSpeed == 1)
-    {
-      /* LED3 toggles each 200 ms */
-      STM_EVAL_LEDToggle(LED3);
-      
-      /* maintain LED3 status for 200ms */
-      Delay(200);
-    }
-    else
-    {  
-      /* LED3 Off */
-      STM_EVAL_LEDOff(LED3);
-    }
+      Delay(300);
   }
 }
 
diff --git a/stm32l100c_discovery.h b/stm32l100c_discovery.h
--- a/stm32l100c_discovery.h
+++ b/stm32l100c_discovery.h
@@ -27,20 +27,20 @@ typedef enum
 #define LEDn                             2
 
 #define LED3_PIN                         GPIO_Pin_9
-#define LED3_GPIO_PORT                   GPIOC
-#define LED3_GPIO_CLK                    RCC_AHBPeriph_GPIOC
+#define LED3_GPIO_PORT                   GPIOB
+#define LED3_GPIO_CLK                    RCC_AHBPeriph_GPIOB
   
-#define LED4_PIN                         GPIO_Pin_8
-#define LED4_GPIO_PORT                   GPIOC
-#define LED4_GPIO_CLK                    RCC_AHBPeriph_GPIOC
+#define LED4_PIN                         GPIO_Pin_15
+#define LED4_GPIO_PORT                   GPIOA
+#define LED4_GPIO_CLK                    RCC_AHBPeriph_GPIOA
 
 #define BUTTONn                          1
 
-#define USER_BUTTON_PIN                GPIO_Pin_0
-#define USER_BUTTON_GPIO_PORT          GPIOA
-#define USER_BUTTON_GPIO_CLK           RCC_AHBPeriph_GPIOA
+#define USER_BUTTON_PIN                GPIO_Pin_3
+#define USER_BUTTON_GPIO_PORT          GPIOB
+#define USER_BUTTON_GPIO_CLK           RCC_AHBPeriph_GPIOB
 #define USER_BUTTON_EXTI_LINE          EXTI_Line0
-#define USER_BUTTON_EXTI_PORT_SOURCE   EXTI_PortSourceGPIOA
+#define USER_BUTTON_EXTI_PORT_SOURCE   EXTI_PortSourceGPIOB
 #define USER_BUTTON_EXTI_PIN_SOURCE    EXTI_PinSource0
 #define USER_BUTTON_EXTI_IRQn          EXTI0_IRQn