diff --git a/firmware/main.c b/firmware/main.c
index 0a3d165..b4b113b 100755
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -265,7 +265,9 @@ void CDC1_Task(void)
     for (uint16_t i = 0; i < DataLength; i++)
     {
       // process the received data and descide to do an action
+      LED0_ON;
       cc_processData(Buffer[i]);
+      LED0_OFF;
     }
 
   }
@@ -283,6 +285,8 @@ void USB_serialStreamWriteC(char *data, uint16_t len)
   if (data != NULL && len > 0 && LineEncoding1.BaudRateBPS)
   {
 
+    LED1_ON;
+
     /* Select the Serial Tx Endpoint */
     Endpoint_SelectEndpoint(CDC1_TX_EPADDR);
 
@@ -297,6 +301,8 @@ void USB_serialStreamWriteC(char *data, uint16_t len)
 
     /* Send an empty packet to ensure that the host does not buffer data sent to it */
     Endpoint_ClearIN();
+
+    LED1_OFF;
   }
 
 }