2-Axis Gyroscope Orientation for Three-Axis Motion Sensing
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Solution Overview
Problem
Conventional motion sensing systems using two rotational sensors can only provide rotational outputs around two axes, limiting their capability in applications requiring three-axis rotation, such as gaming, without increasing hardware costs.
Innovation Solution
A hand-held device equipped with a 3-axis accelerometer and a single 2-axis gyroscope, where one axis of the gyroscope is parallel to the Z axis and the other forms an acute angle with the X axis, allows the receiver device to calculate rotational data around all three axes by using the sensed acceleration and angular speed data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional pointing device uses only two rotational sensors, then the hardware cost is reduced, but the device cannot provide rotational output around the third axis (Y axis)
Solution Approach 1:
The patent changes the orientation parameters of the 2-axis gyroscope relative to the hand-held device axes. By positioning the first axis parallel to the Z axis and the second axis at an acute angle with the X axis, the system enables calculation of rotation around all three axes (X, Y, Z) through mathematical transformation of the sensor data, rather than requiring a third physical sensor.
2Adaptability or versatility
If a pointing device integrates three rotational sensors to provide rotation around all three axes, then the adaptability for gaming applications is improved, but the hardware cost increases
Solution Approach 1:
The patent makes the 2-axis gyroscope serve multiple functions by strategically positioning its axes. The first axis measures rotation around the Z axis directly, while the second axis, positioned at an acute angle, enables calculation of rotation around both the X and Y axes through coordinate transformation. This multi-functional use of limited sensors achieves three-axis rotational capability without adding hardware.
3Device complexity
If only two rotational outputs are provided for cursor movement, then the device complexity is reduced, but the system cannot support games requiring third-axis rotation control
Solution Approach 1:
The patent introduces mathematical calculation as an intermediary process between the physical sensors and the rotational outputs. The microcontroller performs coordinate transformation calculations on the data from the 2-axis gyroscope, converting the limited sensor measurements into three rotational components (around X, Y, and Z axes) that can be used for various applications including gaming.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the calculation of rotational data around each axis, enhancing control and realism in applications like tennis and golf games without the need for additional hardware, thus reducing costs.
Implementation Method 1
a G-sensor (one 3-axis accelerometer)
Implementation Method 2
only one 2-axis gyroscope
Data Source
AI summary
A motion sensing system includes a hand-held device and a receiver device. The hand-held device includes a microcontroller, a G-sensor (one 3-axis accelerometer), only one 2-axis gyroscope, and a wireless transmitter. The receiver device is preferably a dongle and includes a microcontroller and a wireless receiver. A first axis of the 2-axis gyroscope is parallel to the Z axis of the hand-held device and the second axis of the 2-axis gyroscope forms an acute angle α with the X axis of the hand-held device. The acute angle α allows the microcontroller of the receiver device to calculate rotational data around each of the three axis of the hand-held device.