diff --git a/firmware/src/config.h b/firmware/src/config.h
index 1032a84..0b9bd6a 100644
--- a/firmware/src/config.h
+++ b/firmware/src/config.h
@@ -48,4 +48,25 @@ const int P_LED_KEY = 42;
 const int P_LED_KNOB = 41;
 const int P_LED_ROTARY = 40;
 
+// ========================================
+// Constants
+// ========================================
+
+typedef struct note
+{
+    char name[4];
+    u16 midi;
+} Note;
+
+// 61 Notes from C2 to C7
+const int NUM_NOTES = 61;
+const Note notes[] = {
+        {"C2", 36}, {"C#2", 37}, {"D2", 38}, {"D#2", 39}, {"E2", 40}, {"F2", 41}, {"F#2", 42}, {"G2", 43}, {"G#2", 44}, {"A2", 45}, {"A#2", 46}, {"B2", 47},
+        {"C3", 48}, {"C#3", 49}, {"D3", 50}, {"D#3", 51}, {"E3", 52}, {"F3", 53}, {"F#3", 54}, {"G3", 55}, {"G#3", 56}, {"A3", 57}, {"A#3", 58}, {"B3", 59},
+        {"C4", 60}, {"C#4", 61}, {"D4", 62}, {"D#4", 63}, {"E4", 64}, {"F4", 65}, {"F#4", 66}, {"G4", 67}, {"G#4", 68}, {"A4", 69}, {"A#4", 70}, {"B4", 71},
+        {"C5", 72}, {"C#5", 73}, {"D5", 74}, {"D#5", 75}, {"E5", 76}, {"F5", 77}, {"F#5", 78}, {"G5", 79}, {"G#5", 80}, {"A5", 81}, {"A#5", 82}, {"B5", 83},
+        {"C6", 84}, {"C#6", 85}, {"D6", 86}, {"D#6", 87}, {"E6", 88}, {"F6", 89}, {"F#6", 90}, {"G6", 91}, {"G#6", 92}, {"A6", 93}, {"A#6", 94}, {"B6", 95},
+        {"C7", 96}
+};
+
 #endif //FIRMWARE_CONFIG_H
\ No newline at end of file
diff --git a/firmware/src/main.cpp b/firmware/src/main.cpp
index d84c14e..afcb88a 100644
--- a/firmware/src/main.cpp
+++ b/firmware/src/main.cpp
@@ -15,23 +15,6 @@
 u64 start_time = 0;
 u64 last_refresh_time = 0;
 
-typedef struct note
-{
-    char name[4];
-    u16 midi;
-} Note;
-
-// 61 Notes from C2 to C7
-const int NUM_NOTES = 61;
-const Note notes[] = {
-    {"C2", 36}, {"C#2", 37}, {"D2", 38}, {"D#2", 39}, {"E2", 40}, {"F2", 41}, {"F#2", 42}, {"G2", 43}, {"G#2", 44}, {"A2", 45}, {"A#2", 46}, {"B2", 47},
-    {"C3", 48}, {"C#3", 49}, {"D3", 50}, {"D#3", 51}, {"E3", 52}, {"F3", 53}, {"F#3", 54}, {"G3", 55}, {"G#3", 56}, {"A3", 57}, {"A#3", 58}, {"B3", 59},
-    {"C4", 60}, {"C#4", 61}, {"D4", 62}, {"D#4", 63}, {"E4", 64}, {"F4", 65}, {"F#4", 66}, {"G4", 67}, {"G#4", 68}, {"A4", 69}, {"A#4", 70}, {"B4", 71},
-    {"C5", 72}, {"C#5", 73}, {"D5", 74}, {"D#5", 75}, {"E5", 76}, {"F5", 77}, {"F#5", 78}, {"G5", 79}, {"G#5", 80}, {"A5", 81}, {"A#5", 82}, {"B5", 83},
-    {"C6", 84}, {"C#6", 85}, {"D6", 86}, {"D#6", 87}, {"E6", 88}, {"F6", 89}, {"F#6", 90}, {"G6", 91}, {"G#6", 92}, {"A6", 93}, {"A#6", 94}, {"B6", 95},
-    {"C7", 96}
-};
-
 u32 lasts[NUM_NOTES];  // variable to store the value coming from the sensor
 u64 last_hit_times[NUM_NOTES];