KR20020005287A - Location information input device of serial communication method using power of PS / 2 port - Google Patents

Abstract

PURPOSE: A position information inputting apparatus using PS/2 power through serial communication is provided to prevent a defective signal transfer because there is not a mechanical contact like a ball mouse and increase a mechanical life span in such a manner that a pointing apparatus does not contact with a pad or a surface. CONSTITUTION: An acceleration unit(11a) senses an X coordinate rotation of an acceleration unit. A CPU(12) converts and transmits the values of the acceleration units(11a,11b) which sense the Y coordinate rotation. A button(13) resets the signals. Left and right buttons(6,7) operate the operation of the left and right buttons of a common mouse. The mouse and the support are engaged, so that the left, right, upper and right direction movements are obtained for thereby implementing a 2-axis rotation. Namely, the acceleration unit generates a position direction because a DUTY ratio is varied by the rotation.

Description

Location information input device of serial communication method using power of PS / 2 port {.}

The present invention relates to a pointing device using a size of the duty ratio of an accelerometer using a serial port and a PS / 2 port. A general pointing device is a device for controlling the position of a cursor on a display screen. It also uses either a serial port or a PS / 2 port. A mouse is a typical pointing device currently used in computers.

FIG. 1 is a view showing an inner tube of a ball mouse. As shown in FIG. 1, when a ball mouse is moved by touching a ball 1 of a ball mouse to a flat surface, the ball rotates. On the other hand, since the vertical rollers 2 and the horizontal rollers 3 are positioned at an angle of 90 ° to each other and are in contact with the balls, the two rollers also rotate as the balls rotate. At this time, the vertical roller corresponds to the vertical movement of the cursor on the display screen, and the horizontal roller corresponds to the left and right movement of the cursor.

Each roller is connected to a wheel called an encoder 4 so that the encoder rotates as the roller rotates. A signal proportional to the amount of rotation of each encoder, that is, the amount of movement of the mouse, is generated from each encoder and transmitted to the computer through the one chip controller 5.

The computer receives the signal from the mouse and displays the cursor at the location on the corresponding display screen.

On the other hand, there are buttons 6 and 7 at the top of the ball mouse, and when each button is pressed, a signal for this is also transmitted to the computer through the one chip controller 5.

The current mouse as a pointing device has disadvantages in many ways. First, the ball mouse has a characteristic that signals are incompletely transmitted by the contact of a mechanical device and the life is short. In addition, the optical mouse must be used on the mouse pad that recognizes the sensitivity of the mouse.

These mice also have the disadvantage of having to touch the plane, and also because they have to move with their arms and wrists, the momentum is greater than other devices.

In addition, you need to use another device, such as a laser point or a display bar, for the presentation.In the case of a presentation using a device such as a computer, it is necessary to mobilize another person to run the program or to return to the computer at each operation. It should be driven by keyboard.

An object of the present invention proposes the present invention to supplement and develop a pointing device, such as a mouse having the above disadvantages, first, because there is no mechanical contact, such as a ball mouse, incomplete signal transmission by the contact does not occur and mechanical life This does not affect the point and the pointing device does not necessarily have to touch the pad or the plane. In addition, by moving in space or moving on a support without moving on a two-dimensional plane, there is no need for a motion such as the movement of a general pointing device, and the point can be manipulated only by the rotational movement of the pointing device.

In addition, the present invention uses a method of measuring the position value by calculating the change in the duty ratio of the accelerometer without going through the digital conversion of the analog signal using the A / D converter used in the pointing device in space previously .

In other words, an accelerometer using a pulse width modulation (PWM) method generates a signal at a constant cycle. At this time, the duty ratio of the signal changes in proportion to the rotation value. 2 shows that the duty ratio due to rotation in one direction with respect to the reference duty ratio in a constant state is changed. Where the DUTY ratio is the ratio of the clock value (9) to the clock value (8) for one cycle, Becomes The rotation direction can be known as the change of duty ratio due to rotation based on the reference duty ratio, and the size of duty ratio by the internal clock of the CPU can be measured without using the A / D converter. You can move the cursor by generating a signal and sending it to your PC. For example, if the duty ratio of the accelerometer increases when it rotates to the right, if the program is programmed in the CPU to move the cursor to the right when the reference motion is rotated to the right, it will be reported that the actual cursor position is moved to the right when the set abnormal size occurs. Move the cursor. In other words, if you want to stop moving the cursor during the movement, you can rotate the device to the reference position. This is possible by using the relative position using the relative value for the change in the duty ratio by using only the value proportional to the rotation, not finding the absolute position using the accelerometer's acceleration value.

In addition, the signal is input through the serial port and the power supply is input through the PS / 2 port. In general, signals through the serial port are more stable than PS / 2, but they cannot be used in systems that require large current values because of their small current values. In general, the power supply through the serial port is converted to a power supply of 5V, 10mA.

The present invention using an accelerometer requires a current value of at least 100 mA, thus using a PS / 2 power supply rather than a serial port power supply.

1 is a schematic diagram of a typical mouse currently in use

2 is a change of the reference duty ratio signal and the duty ratio generated during rotation of the present invention.

3 is a schematic diagram of a pointing device of the present invention.

4 is a block diagram of a pointing device implementation of the present invention.

5 is a schematic diagram of a pointing device using a support which is another embodiment of the present invention;

6 is a schematic diagram of each port used in the present invention.

The present invention configured for the above object,

The present invention relates to a control device that measures a change in posture in space and displays it on a screen, not a method using rotation by friction with an external object, and the configuration measures a change in duty ratio by an accelerometer and controls direction and magnitude. It is composed of a device and a CPU that sends a signal to the PC in accordance with the communication protocol to convert the signal of the conversion signal and buttons to send this value to the PC. In addition, the power line is connected to the PS / 2 port to connect the power supply.

Hereinafter, described in detail by the accompanying drawings as follows.

3 is a schematic diagram of the pointing device of the present invention, comprising an accelerometer 11 and a CPU 12 that measures and calculates changes in the duty ratio that occurs during rotation, and sends a signal to the serial port and is also basic in space. There is one reset switch 13 to set the position, and there are left and right switches 6 and 7 which function like ordinary mice. Signals flow through the serial port 14 to the PC, and power is supplied through the PS / 2 port 15.

Here, the operation of the CPU sees the change in duty ratio and converts the changed amount into a value using the internal timer of the CPU and transmits a signal including the values of the buttons (6, 7, 13) to the PC through the serial port.

Figure 4 is a block diagram of a pointing device implementation of the present invention converts the accelerometer 11a for sensing the x coordinate rotation of the accelerometer and the accelerometers 11b, 11a, 11b for sensing the y coordinate rotation. A CPU 12 serving as a transmission, a switch 13 for resetting a signal, and left and right switches 6 and 7 serving as a left and right button of a general mouse.

5 is a schematic diagram of a pointing device using a support, which is another embodiment of the pointing device of the present invention, in which a mouse 17 and a support 18 are combined. In this case, the coupling is free to move left and right and up and down to play a role of rotating about two axes. In reality, however, the duty ratio changes due to rotation, and the accelerometer generates the position direction.

6 is a schematic diagram of each port of the present invention. The jack of the serial port used in the present invention uses the RXD (19) for receiving data, the TXD (20) for transmitting data, and the GND (21), and the jack of the PS / 2 port provides a VCC terminal for supplying + 5V. (23) and GND 22 are used.

As described above, the device, which is a kind of the location information input device of the present invention, can be supplied with sufficient power while using a serial port with high signal safety. In addition, since the fixed position due to the use of space is not necessary due to the effect of the present invention, it is convenient to use when moving, so that accurate control can be performed even in a narrow seat such as an airplane or a moving vehicle. In addition, in the example fixed to the support does not require the movement of the arm, two-dimensional space, and also when giving a presentation, the person in charge can directly operate the computer, etc. will have a much greater effect.

[Examples of the Invention]

Example 1

Pointing device using accelerometer in presentation

Example 2

2, 3D mouse using DUTY ratio of accelerometer

Example 3

2, 3D joystick using accelerometer duty ratio

Example 4

Remote Control for Internet TV Using DUTY Ratio of Accelerometer

Claims (4)

In the pointing device of a computer, 2, 3D position measurement device using accelerometer using serial port and PS / 2 port power According to claim 1, How to use the pulse generated from accelerometer without using A / D converter in using accelerometer The method according to claim 1 or 2, Pointing device using positional movement in space According to claim 1, 2, 3, Pointing device using the rotary movement method using the support