Remain at 4k sample rate for consistency

firmware/src/hammer.c

@@ -97,7 +97,7 @@ static inline uint16_t read_avg(int count)
 
 static void read_sensor(int chn)
 {
-    reading[chn] = read_avg(1);
+    reading[chn] = read_avg(2);
 }
 
 static inline void update_velocity(int chn)

firmware/src/main.c

@@ -149,7 +149,7 @@ static void core0_loop()
 
         cli_fps_count(0);
         sleep_until(next_frame);
-        next_frame += 166;
+        next_frame += 250;
     }
 }