diff --git a/Inc/main.h b/Inc/main.h
index 4b6b464..1789065 100644
--- a/Inc/main.h
+++ b/Inc/main.h
@@ -92,6 +92,8 @@ void Error_Handler(void);
 #define ButtonPress_GPIO_Port GPIOB
 #define ButtonRight_Pin GPIO_PIN_14
 #define ButtonRight_GPIO_Port GPIOB
+#define system_mode_Pin GPIO_PIN_15
+#define system_mode_GPIO_Port GPIOB
 #define LED_Pin GPIO_PIN_8
 #define LED_GPIO_Port GPIOB
 /* USER CODE BEGIN Private defines */
diff --git a/Src/main.c b/Src/main.c
index 03086aa..65a605b 100644
--- a/Src/main.c
+++ b/Src/main.c
@@ -229,6 +229,13 @@ int main(void)
     if(!HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_14)){
     	ButtonRight_Pressed();
 	}
+    if(!HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_15)){
+    	if(system_mode == Running){
+			system_mode = Offscreen;
+    	}else{
+    		system_mode = Running;
+    	}
+    }
   }
 
 
@@ -443,8 +450,8 @@ static void MX_GPIO_Init(void)
   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
-  /*Configure GPIO pins : ButtonLeft_Pin ButtonPress_Pin ButtonRight_Pin */
-  GPIO_InitStruct.Pin = ButtonLeft_Pin|ButtonPress_Pin|ButtonRight_Pin;
+  /*Configure GPIO pins : ButtonLeft_Pin ButtonPress_Pin ButtonRight_Pin system_mode_Pin */
+  GPIO_InitStruct.Pin = ButtonLeft_Pin|ButtonPress_Pin|ButtonRight_Pin|system_mode_Pin;
   GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
   GPIO_InitStruct.Pull = GPIO_PULLUP;
   HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);