diff --git a/code/espurna/config/arduino.h b/code/espurna/config/arduino.h
index 186060d9..8d0f004c 100644
--- a/code/espurna/config/arduino.h
+++ b/code/espurna/config/arduino.h
@@ -40,7 +40,7 @@
 //#define AITHINKER_AI_LIGHT
 //#define MAGICHOME_LED_CONTROLLER
 //#define MAGICHOME_LED_CONTROLLER_20
-//#define HUACANXING_H801
+#define HUACANXING_H801
 //#define HUACANXING_H802
 //#define JANGOE_WIFI_RELAY_NC
 //#define JANGOE_WIFI_RELAY_NO
diff --git a/code/espurna/libs/fs_math.c b/code/espurna/fs_math.c
similarity index 95%
rename from code/espurna/libs/fs_math.c
rename to code/espurna/fs_math.c
index 8f45eb26..868ba382 100644
--- a/code/espurna/libs/fs_math.c
+++ b/code/espurna/fs_math.c
@@ -6,7 +6,7 @@
 
 /* BEGIN fs_math.c */
 
-#include "fs_math.h"
+#include "libs/fs_math.h"
 
 #include <float.h>
 /*
diff --git a/code/espurna/libs/pwm.h b/code/espurna/libs/pwm.h
index bf5605fb..488a129c 100755
--- a/code/espurna/libs/pwm.h
+++ b/code/espurna/libs/pwm.h
@@ -1,15 +1,28 @@
+/*
+ * Copyright (C) 2016 Stefan Brüns <stefan.bruens@rwth-aachen.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
 #ifndef __PWM_H__
 #define __PWM_H__
 
-/*pwm.h: function and macro definition of PWM API , driver level */
-/*user_light.h: user interface for light API, user level*/
-/*user_light_adj: API for color changing and lighting effects, user level*/
-
-
- /*NOTE!!  : DO NOT CHANGE THIS FILE*/
-
- /*SUPPORT UP TO 8 PWM CHANNEL*/
-//#define PWM_CHANNEL_NUM_MAX 8 
+/*SUPPORT UP TO 8 PWM CHANNEL*/
+#ifndef PWM_CHANNEL_NUM_MAX
+#define PWM_CHANNEL_NUM_MAX 8
+#endif
 
 struct pwm_param {
     uint32 period;
@@ -17,7 +30,6 @@ struct pwm_param {
     uint32  duty[PWM_CHANNEL_NUM_MAX];  //PWM_CHANNEL<=8
 };
 
-
 /* pwm_init should be called only once, for now  */
 void pwm_init(uint32 period, uint32 *duty,uint32 pwm_channel_num,uint32 (*pin_info_list)[3]);
 void pwm_start(void);
diff --git a/code/espurna/libs/pwm.c b/code/espurna/pwm.c
similarity index 99%
rename from code/espurna/libs/pwm.c
rename to code/espurna/pwm.c
index 0e3794c1..ee18814d 100644
--- a/code/espurna/libs/pwm.c
+++ b/code/espurna/pwm.c
@@ -43,9 +43,9 @@
 #endif
 
 #include <c_types.h>
-#include <pwm.h>
 #include <eagle_soc.h>
 #include <ets_sys.h>
+#include "libs/pwm.h"
 
 // from SDK hw_timer.c
 #define TIMER1_DIVIDE_BY_16             0x0004