KR102264398B1 - Multi-button recognition method using adding circuits and apparatus therefor - Google Patents

Abstract

Disclosed are an apparatus and method for recognizing a multi-button using an addition circuit. A multi-button recognition apparatus according to an embodiment of the present invention includes: a plurality of buttons to which predetermined different voltages are applied to each of one side; an addition circuit connected to the other side of each of the plurality of buttons and outputting an added voltage by adding voltages input through at least one button pressed among the plurality of buttons; and a controller for recognizing the pressed at least one button based on the added voltage output from the adding circuit.

Description

Multi-button recognition device and method using addition circuit {MULTI-BUTTON RECOGNITION METHOD USING ADDING CIRCUITS AND APPARATUS THEREFOR}

The present invention relates to a multi-button recognition technology, and more particularly, to a method and an apparatus capable of recognizing a multi-button using an addition circuit.

1 shows a conventional voltage distribution method button recognition circuit using an analog input port.

1, in the conventional button recognition circuit, when button 3 is pressed, a voltage of R3/(R3+R4)×VCC is input to the analog input port, and when button 2 is pressed, (R2+R3)/(R2+R3) +R4)×VCC is input, and when button 1 is pressed, (R1+R2+R3)/(R1+R2+R3+R4)×VCC is input and controlled.

At this time, if button 1 and button 2 are pressed at the same time, the voltage of (R2+R3)/(R2+R3+R4)×VCC is input to the analog input port and controlled in the same way as when only button 2 is pressed.

As described above, in the conventional button recognition circuit, when only one button is recognized at the same time as one analog input port, and two or more buttons are required to be recognized at the same time, an analog input port must be additionally configured, which increases the circuit configuration cost. .

In addition, in the conventional button recognition circuit, the voltage may be shaken due to noise induced in the vehicle, and thus a button misrecognition may occur.

Embodiments of the present invention provide an apparatus and method for recognizing a multi-button capable of reducing circuit configuration costs by recognizing multiple button inputs simultaneously through one analog input port using an addition circuit.

In embodiments of the present invention, by applying a virtual GND method that separates the ground (GND) of the circuit associated with the analog input port from the system, for example, the vehicle GND, a button that may be generated due to system, for example, vehicle noise Provided are an apparatus and method for recognizing a multi-button capable of preventing erroneous recognition.

A multi-button recognition apparatus according to an embodiment of the present invention includes: a plurality of buttons to which predetermined different voltages are applied to each of one side; an addition circuit connected to the other side of each of the plurality of buttons and outputting an added voltage by adding voltages input through at least one button pressed among the plurality of buttons; and a controller for recognizing the pressed at least one button based on the added voltage output from the adding circuit.

In the multi-button recognition apparatus, an input impedance of a signal line and an input impedance of a ground line may be the same.

The multi-button recognizing device may use a virtual grounding method that is separated from a ground used in a system or device on which the multi-button recognizing device is mounted.

The controller may recognize the pressed at least one button based on a preset recognition voltage range and the added voltage for each of the plurality of buttons.

A different voltage corresponding to a multiple of 1/2 of an operating voltage VCC of an analog input port to which the added voltage is input may be applied to one side of each of the plurality of buttons.

A multi-button recognition method according to an embodiment of the present invention includes: receiving an added voltage output from an adding circuit connected to the other side of each of a plurality of buttons to which a different predetermined voltage is applied to each side; and recognizing the pressed at least one or more buttons based on the received added voltage, wherein the added voltage is a voltage input through at least one or more buttons pressed among the plurality of buttons in the adding circuit. It is characterized in that the added voltage.

In the addition circuit, the input impedance of the signal line and the input impedance of the ground (GND) line may be the same.

The ground of the addition circuit may use a virtual grounding method that is separated from a ground used in a system or device on which the addition circuit is mounted.

The recognizing may recognize the pressed at least one button based on a preset recognition voltage range and the added voltage for each of the plurality of buttons.

A different voltage corresponding to a multiple of 1/2 of an operating voltage VCC of an analog input port to which the added voltage is input may be applied to one side of each of the plurality of buttons.

According to embodiments of the present invention, the circuit configuration cost can be reduced by simultaneously recognizing multiple button inputs through one analog input port using an addition circuit.

Specifically, according to embodiments of the present invention, it is possible to reduce the circuit configuration cost by adding an addition circuit so that eight buttons (Digital Output) can be determined with one analog input port.

According to embodiments of the present invention, by applying a virtual GND method that separates the ground (GND) of the circuit associated with the analog input port from the system, for example, the vehicle GND, misrecognition of a button that may occur due to external noise is prevented. can do.

1 shows a conventional voltage distribution method button recognition circuit using an analog input port.
2 shows the configuration of a multi-button recognition apparatus according to an embodiment of the present invention.
FIG. 3 shows a circuit configuration of an embodiment for explaining the addition circuit shown in FIG. 2 .
4 shows an exemplary diagram for explaining a recognized voltage range of each button.
5 is a diagram illustrating an example for explaining the principle of introducing vehicle noise.
6 is an exemplary diagram illustrating a method of designing a virtual GND.
7 is a diagram illustrating an example of a waveform recognized by the controller after the virtual GND is implemented.
8 is a flowchart illustrating a multi-button recognition method according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the examples. In addition, like reference numerals in each figure denote like members.

The present invention relates to a technology for realizing multi-button recognition using an addition circuit, and when implementing button recognition using an analog input port, only one button could be recognized with one analog input port, but the addition circuit The main point is to reduce the circuit configuration cost by implementing the method used so that multiple buttons can be recognized simultaneously with one Analog Input Port.

Furthermore, the present invention applies a virtual GND method that separates the ground (GND) of the circuit associated with the analog input port from the system, for example, the vehicle GND, in order to compensate for the analog input port's vulnerability to external noise. For example, it is possible to prevent misrecognition of a button that may occur due to vehicle noise.

The existing button recognition method using an analog input port can recognize only one button at the same time per one analog input port, so when n button inputs are required at the same time, n analog input ports have to be used, so the circuit configuration cost increases. . In order to solve this problem, the present invention can reduce the circuit configuration cost by adding an addition circuit so that several button inputs can be recognized at the same time through one analog input port.

FIG. 2 shows a configuration of a multi-button recognition apparatus according to an embodiment of the present invention, and FIG. 3 shows a circuit configuration of an embodiment for explaining the addition circuit shown in FIG. 2 .

If the resolution of the analog input port is 256 and the operating voltage is VCC, the minimum voltage unit that the analog input port can recognize is VCC/256.

2 and 3 , a multi-button recognition apparatus according to an embodiment of the present invention includes a button input unit, an addition circuit, and a control unit.

The button input unit includes a plurality of buttons, for example, buttons 1 to 3, and at least one button is input by a user input.

The addition circuit includes a plurality of OPAMPs (OPAMP1, OPAMP2).

At this time, the ground (GND) of the addition circuit is applied to a virtual GND method that separates the system, for example, the vehicle GND, thereby preventing a button misrecognition from occurring due to external noise generated in the system, etc., and through this It can compensate for the weakness of the Analog Input Port to external noise.

Specifically, by applying a voltage of VCC/2 to one terminal of button 1 and connecting the other terminal to the (-) terminal of OPAMP1, when button 1 is pressed, a current corresponding to the voltage of VCC/2 flows to ⓐ, ⓑ A voltage of -VCC/2 is generated at the point, and a voltage of VCC/2 is applied to ⓒ and input to the Analog Input Port.

By applying a voltage of VCC/4 to one terminal of button 2 and connecting the other terminal to the (-) terminal of OPAMP1, when button 2 is pressed, a current corresponding to the voltage of VCC/4 flows to ⓐ, and at point ⓑ, - A voltage of VCC/4 is generated, and a voltage of VCC/4 is applied to ⓒ and input to the Analog Input Port.

By applying a voltage of VCC/8 to one terminal of button 3 and connecting the other terminal to the (-) terminal of OPAMP1, when button 3 is pressed, a current corresponding to the voltage of VCC/8 flows to ⓐ and -VCC at point ⓑ. A voltage of /8 is generated, and a voltage of VCC/8 is applied to ⓒ and input to the Analog Input Port.

Here, when button 1 and button 2 are pressed at the same time, the current corresponding to VCC/2 and the current corresponding to VCC/4 are added to flow in ⓐ, and the voltage of -(VCC/2 + VCC/4) at point ⓑ is is generated, and a voltage of VCC/2 + VCC/4 is applied to ⓒ and is input to the Analog Input Port. Similarly, when button 2 and button 3 are pressed at the same time, the current corresponding to VCC/4 and the current corresponding to VCC/8 are added to flow to ⓐ, and the voltage of -(VCC/4 + VCC/8) is applied at point ⓑ. The voltage of VCC/4 + VCC/8 is applied to ⓒ and is input to the Analog Input Port.

The control unit recognizes whether the button is pressed based on the voltage applied to the analog input port.

In this case, the controller may recognize which buttons are pressed based on a voltage range preset for each of the buttons.

For example, as shown in FIG. 4 , the voltage range for recognizing that button 1 is pressed may be set from 1×VCC/2 to 2×VCC/2, and the voltage for recognizing that button 2 is pressed The range can be set from 1×VCC/4 to 2×VCC/4 or from 3×VCC/4 to 4×VCC/4, and the voltage range for recognizing that button 3 is pressed is from 1×VCC/8 Can be set from 2×VCC/8 or 3×VCC/8 to 4×VCC/8 or 5×VCC/8 to 6×VCC/8 or 7×VCC/8 to 8×VCC/8 .

That is, when a voltage is applied to the analog input port, the controller may recognize whether each button is pressed or not based on the recognized voltage range of each button set as shown in FIG. 4 .

For example, when a voltage corresponding to ① of FIG. 4 is input to the Analog Input Port, the control unit determines that button 1 is 0, button 2 is 1, and button 3 is 0, so that button 1 and button 3 are not pressed, and the button is not pressed. 2 is recognized as being pressed.

As another example, when the voltage corresponding to ② of FIG. 4 is input to the Analog Input Port, button 1 is determined as 1, button 2 is 0, and button 3 is determined as 1, so that button 2 is recognized as not pressed and button 1 and button 3 is recognized as being pressed.

As another example, when the voltage corresponding to ③ of FIG. 4 is input to the Analog Input Port, it is determined that button 1 is 1, button 2 is 1, and button 3 is 1, so that button 1, button 2, and button 3 are all pressed. Recognize.

In the present invention, if the resolution of the Analog Input Port is assumed to be 256, the minimum voltage that the Analog Input Port can determine is VCC/256, and the voltage applied to each button is the minimum voltage that the Analog Input Port can determine. You can increase the number of buttons until .

At this time, the maximum number of buttons that can be determined by one analog input port and the corresponding voltage value may be as shown in <Table 1> below.

[Table 1]

5 is an exemplary diagram for explaining the principle of introducing vehicle noise. As shown in FIG. 5, when the signal line and the GND are designed to be adjacent to each other, the same level of noise is introduced into the signal line and the GND, but the input impedance of the GND ) is low, so it appears as low level noise at GND.

At this time, the control unit measures the voltage value of the signal line based on GND, which is determined as the voltage difference between the signal line and GND. As shown in FIG. 5 , noise remains in the recognized waveform, and therefore, in button recognition, Errors may occur.

In this way, it is necessary to remove external noise induced by the multi-button recognition device, for example, noise induced in the vehicle. In the present invention, the input impedance of the GND line used in the multi-button recognition device, that is, the analog input port circuit, is equal to the input impedance of the signal line. design the same

That is, in the multi-button recognition device according to the embodiment of the present invention, since the input impedance of the GND line and the input impedance of the signal line are the same, the external noise induced by the device, for example, the external noise induced from the vehicle, is shown in FIG. As shown, the same level is applied to the signal line and the GND line, and the voltage difference between the signal and GND due to the noise transmitted to the control unit becomes 0.

Accordingly, the control unit can recognize the button with the voltage value from which the noise has been removed, thereby preventing a malfunction of the button recognition that may be caused by external noise.

As described above, in order to make the input impedance of GND equal to the input impedance of the signal, as shown in FIG. 6 , the virtual GND used in the addition circuit and the controller is separated from the GND used in the system, for example, a vehicle. By using the GND method, implementation is possible.

As described above, the multi-button recognizing apparatus according to an embodiment of the present invention recognizes multiple button inputs through one analog input port at the same time using an addition circuit, thereby reducing circuit configuration costs.

In addition, the multi-button recognition apparatus according to an embodiment of the present invention may be generated due to external noise by applying a virtual GND method that separates the ground (GND) of the circuit associated with the analog input port from the system, for example, the vehicle GND. It can prevent misrecognition of the buttons.

8 is a flowchart illustrating an operation for a multi-button recognition method according to an embodiment of the present invention, and is a flowchart illustrating an operation performed in the apparatuses of FIGS. 2 to 7 described above.

Referring to FIG. 8 , the multi-button recognition method according to an embodiment of the present invention sets a recognition voltage range for recognizing that a button is pressed for each of a plurality of buttons ( S810 ).

At this time, a voltage is applied to one side of each of the plurality of buttons, the other side may be connected to the addition circuit, and the voltage applied to each of the plurality of buttons through one side is an analog input port to which the addition voltage is input. port) may be different voltages corresponding to 1/2 multiple of the operating voltage VCC.

The recognition voltage range of each of the plurality of buttons set by step S810 may vary according to a voltage applied to each of the buttons, as illustrated in FIG. 4 .

After the recognition voltage range of each of the plurality of buttons is set by step S810, the added voltage added by the addition circuit, that is, the added voltage to which the voltage inputted through at least one or more buttons pressed among the plurality of buttons is added to the Analog Input When received through the port, the received added voltage is compared with the recognized voltage range of each of the plurality of buttons set in step S810 (S820, S830).

At this time, the addition circuit may include a plurality of OPAMPs (OPAMP1, OPAMP2) as described above, and the ground (GND) of the addition circuit is separated from the system, for example, the vehicle GND. It prevents misrecognition of buttons due to external noise generated from places such as etc., and through this, it is possible to compensate for the weakness of the Analog Input Port to external noise.

At this time, the addition circuit is designed so that the input impedance of the signal line and the input impedance of the ground (GND) line are the same, so that the button misrecognition is prevented from occurring due to external noise generated in the system, etc. and induced in the multi-button recognition device. can

At least one pressed button among the plurality of buttons is recognized based on the comparison result of step S830 (S840).

In this case, in step S840, by comparing the added voltage with the recognized voltage range of each of the plurality of buttons, and recognizing the button of the recognized voltage range including the added voltage, the pressed button among the plurality of buttons may be recognized.

In addition to the content of the method described with reference to FIG. 8 , the method according to an embodiment of the present invention may include the content described with reference to FIGS. 2 to 7 .

The system or apparatus described above may be implemented as a hardware component, a software component, and/or a combination of the hardware component and the software component. For example, the systems, devices and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA). ), a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions, may be implemented using one or more general purpose or special purpose computers. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For convenience of understanding, although one processing device is sometimes described as being used, one of ordinary skill in the art will recognize that the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that can include For example, the processing device may include a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as parallel processors.

Software may comprise a computer program, code, instructions, or a combination of one or more of these, which configures a processing device to operate as desired or is independently or collectively processed You can command the device. The software and/or data may be any kind of machine, component, physical device, virtual equipment, computer storage medium or device, to be interpreted by or to provide instructions or data to the processing device. , or may be permanently or temporarily embody in a transmitted signal wave. The software may be distributed over networked computer systems, and stored or executed in a distributed manner. Software and data may be stored in one or more computer-readable recording media.

The method according to the embodiments may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described with reference to the limited embodiments and drawings, various modifications and variations are possible from the above description by those skilled in the art. For example, the described techniques are performed in a different order than the described method, and/or the described components of the system, structure, apparatus, circuit, etc. are combined or combined in a different form than the described method, or other components Or substituted or substituted by equivalents may achieve an appropriate result.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (10)

a plurality of buttons to which a different predetermined voltage is applied to each of one side;
an addition circuit connected to the other side of each of the plurality of buttons and outputting an added voltage by adding voltages input through at least one button pressed among the plurality of buttons; and
A control unit for recognizing the pressed at least one button based on the added voltage output from the adding circuit
A multi-button recognition device comprising a.
According to claim 1,
The multi-button recognition device is
A multi-button recognition device, characterized in that the input impedance of the signal line and the input impedance of the ground (GND) line are the same.
According to claim 1,
The ground of the summing circuit is
A multi-button recognition device, characterized in that it uses a virtual grounding method that is separated from a ground used in a system or device on which the multi-button recognition device is mounted.
According to claim 1,
the control unit
Multi-button recognition apparatus, characterized in that for recognizing the pressed at least one button based on the added voltage and a preset recognition voltage range for each of the plurality of buttons.
According to claim 1,
Each of the plurality of buttons
A multi-button recognition device, characterized in that a different voltage corresponding to a multiple of 1/2 of an operating voltage (VCC) of an analog input port to which the added voltage is input is applied to the one side.
receiving an addition voltage output from an addition circuit connected to the other side of each of a plurality of buttons to which a different predetermined voltage is applied to each side; and
Recognizing at least one or more buttons pressed based on the received added voltage
including,
The added voltage is
A multi-button recognition method that is a voltage obtained by adding a voltage input through at least one button pressed among the plurality of buttons in the addition circuit.
7. The method of claim 6,
The addition circuit is
A multi-button recognition method, characterized in that the input impedance of the signal line and the input impedance of the ground (GND) line are the same.
7. The method of claim 6,
The ground of the summing circuit is
A multi-button recognition method, characterized in that using a virtual grounding method that is separated from a ground used in a system or device on which the addition circuit is mounted.
7. The method of claim 6,
The recognizing step
A multi-button recognition method, characterized in that for recognizing the pressed at least one button based on a preset recognition voltage range and the added voltage for each of the plurality of buttons.
7. The method of claim 6,
Each of the plurality of buttons
A multi-button recognition method, characterized in that different voltages corresponding to 1/2 multiples of an operating voltage (VCC) of an analog input port to which the added voltage is input are applied to the one side.

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