diff --git a/Src/stm32f4xx_it.c b/Src/stm32f4xx_it.c
index 27e3757..9be4b36 100644
--- a/Src/stm32f4xx_it.c
+++ b/Src/stm32f4xx_it.c
@@ -56,6 +56,7 @@
 
 /* External variables --------------------------------------------------------*/
 extern TIM_HandleTypeDef htim3;
+extern int tim3_semaphore;
 /* USER CODE BEGIN EV */
 
 /* USER CODE END EV */
@@ -259,6 +260,7 @@ void TIM3_IRQHandler(void)
 {
   /* USER CODE BEGIN TIM3_IRQn 0 */
   // BLink Led1
+
   HAL_GPIO_TogglePin(LED1_GPIO_Port, LED1_Pin);
   /* USER CODE END TIM3_IRQn 0 */
   HAL_TIM_IRQHandler(&htim3);
diff --git a/motorBoard.pdf b/motorBoard.pdf
index 5ab65f6..0342e0d 100644
Binary files a/motorBoard.pdf and b/motorBoard.pdf differ