Simplify tracking

source/config.h

@@ -158,8 +158,7 @@ struct __attribute__((packed)) ImuPacket {
 static_assert(sizeof(ImuPacket) == 14, "ImuPacket must be 14 bytes");
 #endif
 
-// Tuning constants 
-extern const float ALPHA;
+// Tuning constants
 extern const int   LOOP_RATE_MS;
 extern const int   BIAS_SAMPLES;
 extern const int   IDLE_FRAMES;
@@ -184,10 +183,8 @@ extern const float BATT_CRITICAL;
   extern const unsigned long AUTO_RECAL_MS;
 #endif
 
-// Global state 
-extern float angleX, angleY;
+// Global state
 extern float accumX, accumY;
-extern float gravX, gravY, gravZ;
 extern float biasGX, biasGY, biasGZ;
 extern float calTempC;
 extern float cachedTempC;