1 files changed, 7 insertions, 0 deletions
diff --git a/shiftbrite.h b/shiftbrite.h
index d2f5ebd..09edffb 100644
--- a/shiftbrite.h
+++ b/shiftbrite.h
@@ -1,5 +1,12 @@
+#ifndef SHIFTBRITE_H
+#define SHIFTBRITE_H
+
 // setup port for shiftbrites
 void sb_init(void);
 
 // set the color of a shiftbrite.
 void sb_setcolor(uint8_t lamp_index, uint8_t r, uint8_t g, uint8_t b);
+
+void sb_tick(void);
+
+#endif //SHIFTBRITE_H