3 files changed, 15 insertions, 0 deletions
diff --git a/config.h b/config.h
index 00816db..72357e3 100644
--- a/config.h
+++ b/config.h
@@ -1,3 +1,6 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
 #define F_CPU 8000000UL
 
 #define LED_COUNT 50
@@ -16,3 +19,5 @@
 	{26, 37}
 
 #define ISR_PIN PB4
+
+#endif
diff --git a/eq.h b/eq.h
index 2ad7beb..fd28b25 100644
--- a/eq.h
+++ b/eq.h
@@ -1,4 +1,9 @@
+#ifndef EQ_H
+#define EQ_H
+
 extern unsigned char eq_levels[];
 
 void eq_decay();
 void eq_read();
+
+#endif
diff --git a/led.h b/led.h
index fd11a87..4f5cc09 100644
--- a/led.h
+++ b/led.h
@@ -1,5 +1,10 @@
+#ifndef LED_H
+#define LED_H
+
 struct colour {
 	unsigned char r, g, b;
 };
 
 void led_signal_sequence(int, struct colour *, int, int, int);
+
+#endif