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diff --git a/lib_ws2812.h b/lib_ws2812.h
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+/*
+ * light weight WS2812 lib include
+ *
+ * Version 2.0a3  - Jan 18th 2014
+ * Author: Tim (cpldcpu@gmail.com) 
+ *
+ * Please do not change this file! All configuration is handled in "ws2812_config.h"
+ *
+ * License: GNU GPL v2 (see License.txt)
+ +
+ */
+
+#ifndef LIGHT_WS2812_H_
+#define LIGHT_WS2812_H_
+
+/*
+ *  Structure of the LED array
+ */
+
+struct RGB
+{
+  uint8_t g;
+  uint8_t r;
+  uint8_t b;
+};
+
+/* User Interface
+ * 
+ * Input:
+ *         ledarray:           An array of GRB data describing the LED colors
+ *         number_of_leds:     The number of LEDs to write
+ *         pinmask (optional): Bitmask describing the output bin. e.g. _BV(PB0)
+ *
+ * The functions will perform the following actions:
+ *         - Set the data-out pin as output
+ *         - Send out the LED data 
+ *         - Wait 50盜 to reset the LEDs
+ */
+
+void ws2812_setleds (struct RGB *ledarray, uint16_t number_of_leds);
+void ws2812_setleds_pin (struct RGB *ledarray, uint16_t number_of_leds,
+                         uint8_t pinmask);
+
+/* 
+ * Old interface / Internal functions
+ *
+ * The functions take a byte-array and send to the data output as WS2812 bitstream.
+ * The length is the number of bytes to send - three per LED.
+ */
+
+void ws2812_sendarray (uint8_t * array, uint16_t length);
+void ws2812_sendarray_mask (uint8_t * array, uint16_t length,
+                            uint8_t pinmask);
+
+
+/*
+ * Internal defines
+ */
+
+#define CONCAT(a, b)            a ## b
+#define CONCAT_EXP(a, b)   CONCAT(a, b)
+
+
+#endif /* LIGHT_WS2812_H_ */