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diff --git a/FanController/fan_controller/hw/led.h b/FanController/fan_controller/hw/led.h
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+/* Autor: Ján Sučan <jan@jansucan.sk>
+ * 
+ * Zdrojove kody, ich casti a subory z nich vzniknute priamo alebo nepriamo
+ * (objektove subory, Intel Hex, ...) prosim nepouzivajte komercne, ani ako
+ * sucast komercnych diel. Vsetky ostatne pripady pouzitia su dovolene.
+ *
+ * Please don't use the source codes, their parts and files created from them
+ * directly or indirectly, (object files, Intel Hex files, ...) for commercial
+ * purposes, not even as a part of commercial products. All other use cases
+ * are allowed.
+ */
+
+#ifndef LED_H_
+#define LED_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/** Pocet LED v stlpci zelenych LED pre indikaciu otacok. LED najviac nalavo nie je zapocitana. */
+#define LED_GREEN_BAR_LED_COUNT    8U
+
+void led_init(void);
+void led_red_off(void);
+void led_red_on(void);
+void led_min_green_off(void);
+void led_min_green_set(uint8_t light);
+void led_min_green_on(void);
+void led_green_bar_show_by_mask(uint8_t mask);
+bool led_green_bar_will_be_changed_by_value(uint8_t value);
+void led_green_bar_show_by_value(uint8_t value);
+
+#endif /* LED_H_ */
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