add const.h

const.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#define MUX_S0 2
+#define MUX_S1 3
+#define MUX_S2 4
+
+#define MUX0 26
+#define MUX1 27
+
+#define AUDIO_OUTPUT 0
+#define STATUS_LED 1