System and method for providing a simple and reliable inertia measurement unit (IMU)

An unmanned aerial vehicle (UAV), comprising:

• a body;
• and
• an inertia measurement unit (IMU) configured to determine a spatial disposition for the UAV, the IMU comprising:
• a main circuit board;
• a first weight block, wherein:
• a first surface of the first weight block contacts the main circuit board,
• the first weight block comprises:
• a recess formed on a second surface of the first weight block opposite to the first surface, and
• an opening formed on a side surface of the first weight block;
• a second weight block coupled to the first weight block on the second surface to cover the recess, wherein the first weight block and the second weight block jointly form an inner chamber and the opening is in communication with the inner chamber;
• a circuit board disposed in the inner chamber;
• and
• a signal line coupled to an edge of the circuit board and extending out of the opening, wherein the signal line bends over an outer surface of the first weight block or the second weight block to connect to the main circuit board.