diff --git a/app/include/user_config.h b/app/include/user_config.h
index 32a3b3c8..a47054fb 100644
--- a/app/include/user_config.h
+++ b/app/include/user_config.h
@@ -7,7 +7,9 @@
 #define NODE_VERSION_INTERNAL   0U
 
 #define NODE_VERSION	"NodeMCU 0.9.5"
-#define BUILD_DATE	    "build 20150127"
+#define BUILD_DATE	    "build 20150212"
+
+// #define DEVKIT_VERSION_0_9 1 	// define this only if you use NodeMCU devkit v0.9
 
 // #define FLASH_512K
 // #define FLASH_1M
@@ -50,6 +52,7 @@
 #define BUILD_SPIFFS	1
 
 #define LUA_USE_MODULES
+
 #ifdef LUA_USE_MODULES
 #define LUA_USE_MODULES_NODE
 #define LUA_USE_MODULES_FILE
@@ -65,9 +68,15 @@
 #define LUA_USE_MODULES_OW
 #define LUA_USE_MODULES_BIT
 #define LUA_USE_MODULES_MQTT
-#define LUA_USE_MODULES_WS2812
+// #define LUA_USE_MODULES_WS2812	// TODO: put this device specific module to device driver section.
 #endif /* LUA_USE_MODULES */
 
+// TODO: put device specific module to device driver section.
+#ifdef LUA_USE_DEVICE_DRIVER
+#define LUA_USE_DEVICE_WS2812
+#endif /* LUA_USE_DEVICE_DRIVER */
+
+
 // #define LUA_NUMBER_INTEGRAL
 
 #define LUA_OPTRAM
@@ -78,6 +87,8 @@
 #endif	/* LUA_OPTRAM */
 
 #define READLINE_INTERVAL	80
+
+#ifdef DEVKIT_VERSION_0_9
 #define KEY_SHORT_MS	200
 #define KEY_LONG_MS		3000
 #define KEY_SHORT_COUNT (KEY_SHORT_MS / READLINE_INTERVAL)
@@ -85,5 +96,6 @@
 
 #define LED_HIGH_COUNT_DEFAULT 10
 #define LED_LOW_COUNT_DEFAULT 0
+#endif
 
 #endif	/* __USER_CONFIG_H__ */
diff --git a/app/lua/lua.c b/app/lua/lua.c
index ef9113f4..27bb3b4b 100644
--- a/app/lua/lua.c
+++ b/app/lua/lua.c
@@ -30,10 +30,13 @@ lua_Load gLoad;
 
 static const char *progname = LUA_PROGNAME;
 
+#ifdef DEVKIT_VERSION_0_9
 static int key_press_count = 0;
 int led_high_count = LED_HIGH_COUNT_DEFAULT;
 int led_low_count = LED_LOW_COUNT_DEFAULT;
 static int led_count = 0;
+#endif
+
 #if 0
 static void lstop (lua_State *L, lua_Debug *ar) {
   (void)ar;  /* unused arg. */
@@ -541,6 +544,7 @@ void dojob(lua_Load *load){
   // NODE_DBG("dojob() is called with firstline.\n");
 }
 
+#ifdef DEVKIT_VERSION_0_9
 extern void key_long_press(void *arg);
 extern void key_short_press(void *arg);
 static bool key_short_pressed = false;
@@ -579,6 +583,7 @@ void update_key_led(){
     }
   }
 }
+#endif
 
 #ifndef uart_putc
 #define uart_putc uart0_putc
@@ -590,7 +595,9 @@ extern uint16_t need_len;
 extern int16_t end_char;
 void readline(lua_Load *load){
   // NODE_DBG("readline() is called.\n");
+#ifdef DEVKIT_VERSION_0_9
   update_key_led();
+#endif
   char ch;
   while (uart_getc(&ch))
   {
diff --git a/app/modules/node.c b/app/modules/node.c
index 11b7b6b6..420b369b 100644
--- a/app/modules/node.c
+++ b/app/modules/node.c
@@ -124,6 +124,9 @@ static int node_heap( lua_State* L )
   return 1;  
 }
 
+static lua_State *gL = NULL;
+
+#ifdef DEVKIT_VERSION_0_9
 extern int led_high_count;  // this is defined in lua.c
 extern int led_low_count;
 // Lua: led(low, high)
@@ -155,7 +158,6 @@ static int node_led( lua_State* L )
 
 static int long_key_ref = LUA_NOREF;
 static int short_key_ref = LUA_NOREF;
-static lua_State *gL = NULL;
 
 void default_long_press(void *arg){
   if(led_high_count == 12 && led_low_count == 12){
@@ -228,6 +230,7 @@ static int node_key( lua_State* L )
 
   return 0;  
 }
+#endif
 
 extern lua_Load gLoad;
 extern os_timer_t lua_timer;
@@ -320,8 +323,10 @@ const LUA_REG_TYPE node_map[] =
   { LSTRKEY( "flashid" ), LFUNCVAL( node_flashid ) },
   { LSTRKEY( "flashsize" ), LFUNCVAL( node_flashsize) },
   { LSTRKEY( "heap" ), LFUNCVAL( node_heap ) },
+#ifdef DEVKIT_VERSION_0_9
   { LSTRKEY( "key" ), LFUNCVAL( node_key ) },
   { LSTRKEY( "led" ), LFUNCVAL( node_led ) },
+#endif
   { LSTRKEY( "input" ), LFUNCVAL( node_input ) },
   { LSTRKEY( "output" ), LFUNCVAL( node_output ) },
   { LSTRKEY( "readvdd33" ), LFUNCVAL( node_readvdd33) },