KR102116333B1 - Method of removing virtual key phenomenon of infrared remote control equipped with conductive rebber contact switch - Google Patents

Abstract

The present invention relates to a method for removing a virtual key phenomenon of an infrared remote control having a rubber contact switch. More particularly, the present invention relates to a method for removing a virtual key phenomenon of an infrared remote control having a rubber contact switch which uses an intrinsic resistance of a contact part known as the disadvantage of the rubber contact switch as the reverse, and uses this for the detection of a virtual key by adjusting only a value of a pull-up resistor used in the existing remote control without the addition of additional hardware to configure voltages generated when using a normal key and the virtual key to be different to each other, so that a microcomputer converts the voltage to analog-to-digital and processes only when the normal key is used, thereby removing the virtual key.

Description

Method for removing virtual key phenomenon of infrared remote control with rubber contact switch {METHOD OF REMOVING VIRTUAL KEY PHENOMENON OF INFRARED REMOTE CONTROL EQUIPPED WITH CONDUCTIVE REBBER CONTACT SWITCH}

The present invention relates to a method of removing a virtual key phenomenon of an infrared remote control having a rubber contact switch, and in particular, uses a specific resistance of a contact part known as a disadvantage of the rubber contact switch in reverse to use it for detection of a virtual key, thereby using separate hardware. By setting only the value of the pull-up resistor used in the existing remote control without adding the value, so that the voltage generated when the normal key and the virtual key are different are configured, the microcomputer converts this voltage to analog-digital and processes it only in the case of the normal key. It relates to a virtual key removal method of the infrared remote control having a rubber contact switch, by which the virtual key can be removed.

Recently, a method of detecting various virtual keys has been proposed and used in individual switch type keyboards (mechanical keyboard), membrane switch type keyboards, and the like, but a method of detecting virtual key in a rubber contact switch type keyboard has not been proposed.

In fact, the rubber contact switch method is mainly used in applications with relatively slow switching speed, for example, TV remote control or electronic calculator, etc., because these devices have few switches and rarely press two or more switches at the same time. Compared to keyboards, virtual keys are rarely generated, so there is no need for research. However, in recent years, the number of applications of rubber contact switches has increased, and especially, as the functions of devices become more complicated, the number of switches increases, and as shown in FIG. 1, in the case of an IPTV remote control or a smart TV remote control, a complete keyboard form is provided.

In particular, in the case of recent IP-TVs or smart-TVs, since a game or the like can be executed on a TV, it is possible to think of using the remote control shown in FIG. 1 for gaming, but in reality, a virtual key is generated by dynamic scanning. Since it cannot be used, there are many restrictions on the application.

However, the rubber contact switch is configured to have a high switch density in a limited area. Especially, due to its simple configuration and low cost, attaching a large number of diodes or applying additional coating to the rubber contact area is relatively expensive in terms of cost. Since the advantages of simplicity and low price, which are the greatest advantages as a rubber contact switch, are damaged, there is a problem that it is difficult to remove the virtual key phenomenon.

Accordingly, there is a need for a method of removing a virtual key phenomenon by using the characteristics of a rubber contact switch without additional hardware in an infrared remote control equipped with a rubber contact switch.

Republic of Korea Patent Publication 2011-0043198 "New key input device for removing ghost key"

Therefore, the present invention has been made to solve the conventional problems as described above, and the object of the present invention is to remove the virtual key phenomenon by using the characteristics of the rubber contact switch without additional hardware, the infrared remote control having a rubber contact switch. It is to provide a method for removing the virtual key phenomenon.

In order to achieve the above object, a method for removing a virtual key phenomenon of an infrared remote control with a rubber contact switch according to an embodiment of the present invention is a keypad in which a plurality of switches are arranged in a matrix form, the keypad and the row input port and the column port. A microcomputer capable of data communication through, and an infrared LED that receives a digital signal from the microcomputer and transmits it in an infrared form. A method for removing the virtual key phenomenon of an infrared remote controller having a rubber contact switch, the power is supplied to the microcomputer and reset. When this occurs, hardware initialization is performed including setting the input and output directions of the row input port and the column port; Initializing a variable including a variable in an ON array that stores a timer variable indicating a row, column number, and auto repeat state of the switch in which the microcomputer is turned on; Initializing a heat counter by the microcomputer; Outputting a low signal to a port of a switch row to be inspected by the microcomputer; Setting the port of the corresponding switch row in the output direction so that the output of the switch row receiving the low signal can be output to the microcomputer; Initializing a row counter by the microcomputer; Checking whether the switch corresponding to the current column and row is registered in the on-array; If a switch corresponding to the current column and row is registered in the step of checking whether or not the registration is performed, performing a process for the on switch by the microcomputer since the switch has been operated on before; When the processing for the on switch is completed, the microcomputer decrementing a row counter for processing of the next switch; Checking whether the micom is the end of a row; In the step of checking whether the end of the row is the end of the row, setting the port direction of the current column as an input by the micom so that the port pin is floated; Decreasing the heat counter by the microcomputer; And checking whether the current column is the end by the microcomputer; and when the current column is finished in the checking whether the current column is over, initializing the column counter by the microcomputer. do.

The method for removing the virtual key phenomenon of the infrared remote control having the rubber contact switch according to the above embodiment is the switch that has been operated off before, if the switch corresponding to the current column and row is not registered in the registration confirmation step. Further comprising the step of performing processing for the off switch by; After the off-switch processing step, the row counter may be reduced.

In the embodiment, the method for removing the virtual key phenomenon of the infrared remote control with the rubber contact switch may proceed to the low signal output step if the current column is not the end in the step of checking whether the column is over.

The method for removing the virtual key phenomenon of the infrared remote controller provided with the rubber contact switch according to the above embodiment may proceed to the registration confirmation step if the end of the row is not the end of the row.

In the method for removing the virtual key phenomenon of the infrared remote control with the rubber contact switch according to the above embodiment, the on-switch processing step converts the input voltage from the switch corresponding to the current column and row to analog-digital conversion by the microcomputer. To do; Checking whether the digital conversion value is less than or equal to a boundary value by the microcomputer; If the digital conversion value is less than or equal to the boundary value, the corresponding switch is still depressed, so the timer variable of the switch is decreased by 1 by the microcomputer; Determining whether the timer variable of the switch is 0 by the microcomputer; If the timer variable of the switch is not 0 in the determining whether it is 0 or not, while the timer variable of the switch is 0, resetting the timer variable for the next auto repeat of the switch by the micom step; The microcomputer transmitting a digital code corresponding to the switch through an infrared LED; If the digital conversion value is greater than the boundary value in the step of determining whether the digital conversion value is less than or equal to the boundary value, the micom removes the row number of the current switch from the on-array; And the microcomputer delaying a set time for removing chattering.

In the method for removing the virtual key phenomenon of the infrared remote controller having a rubber contact switch according to the above embodiment, the off switch processing step is performed by the microcomputer to analogize the input voltage from the switch corresponding to the current column and row. -Digital conversion; Checking whether the digital conversion value is less than or equal to a boundary value by the microcomputer; End if the digital conversion value is greater than the boundary value, and if the digital conversion value is less than or equal to the boundary value, the corresponding switch is depressed, thereby registering the row number of the switch in the on-array by the microcomputer; Initializing a timer variable of the switch by the microcomputer; The microcomputer transmitting a digital code corresponding to the switch through an infrared LED; And delaying the time for a while by the microcomputer to remove chattering occurring at this time since the switch is in the newly pressed state.

According to an embodiment of the present invention, according to a method for removing a virtual key phenomenon of an infrared remote control having a rubber contact switch, when power is supplied to the microcomputer and reset occurs, the input and output directions of the row input port and the column port are included. Hardware initialization is performed (S10); Initializing a variable including a variable in an ON array that stores a timer variable indicating a row, column number, and auto repeat state of the switch in which the microcomputer is turned on (S20). ; Initializing a heat counter by the microcomputer (S30); Outputting a low signal to a port of a switch row to be inspected by the microcomputer (S40); The microcomputer setting the port of the corresponding switch row in the output direction so that the output of the switch row receiving the low signal can be output to the microcomputer (S50); Initializing a row counter by the microcomputer (S60); Checking whether the switch corresponding to the current column and row is registered in the on-array (S70); If the switch corresponding to the current column and row is registered in the registration confirmation step (S70), since the switch has been operated on before, performing a process for the on switch by the microcomputer (S90); When the processing for the on-switch is completed, the microcomputer decrementing a row counter for processing of the next switch (S100); Checking whether the micom is the end of a row (S110); If it is the end of the line in the checking whether the end of the line (S110), setting the port direction of the current column as an input by the micom so that the port pin is floated (S120); Decreasing the heat counter by the microcomputer (S130); And checking whether the current column is over by the microcomputer (S140); Including, if the current column is over at the end of the column verification step (S140), initializing the column counter by the microcomputer Proceeding to (S30); being configured to be, there is an excellent effect that the virtual key phenomenon can be removed using the characteristics of the rubber contact switch without additional hardware.

More specifically, according to an embodiment of the present invention, according to a method for removing a virtual key phenomenon of an infrared remote control having a rubber contact switch, the virtual resistance of the contact portion known as a disadvantage of the rubber contact switch is reversely used to generate the virtual key. The method to be used for the detection of was proposed, and accordingly, by adjusting only the values of the pull-up resistors used in the existing remote control without adding additional hardware, the voltages generated when the normal key and the virtual key are different are finally configured. As a result, Micom has an excellent effect that the virtual key can be removed by converting this voltage to analog-digital conversion and processing only the normal key.

1 is a view showing an example of a general IPTV remote control.
2 is a view showing the structure of a rubber contact switch to which the present invention is applied.
3 is a view showing an example of a keyboard configuration of the rubber contact switch method of FIG. 2, (a) represents the rubber portion, and (b) represents the PCB substrate portion.
4 is a view showing a method of ignoring the intrinsic resistance of the rubber contact of the rubber contact switch of FIG. 2, (a) shows a case where the pull-up resistance is small, and (b) shows the pull-up resistance. It represents a large case.
Fig. 5 shows an equivalent circuit when the rubber contact switch of Fig. 2 is set to a 2'2 arrangement.
FIG. 6 is a view showing an equivalent circuit when inspecting columns Y1 and Y2 of FIG. 5, (a) indicates Y1 column inspection, and (b) indicates Y2 column inspection.
7 shows an equivalent circuit when the rubber contact switch of FIG. 2 is 2 × 3.
FIG. 8 is a view for explaining a virtual key when the rubber contact switch of FIG. 2 is 3 × 2.
FIG. 9 is a view showing an equivalent circuit during Y2 inspection in FIG. 8.
10 is a view showing an experiment circuit for confirming the effect of the virtual key detection method.
FIG. 11 is a diagram showing the voltage difference between the normal key and the virtual key in a state in which the pull-up resistor Rp is 110 인, which is 100 times the rubber contact resistance, in the experiment circuit of FIG. 10, wherein (a) is 2 × 2 and The case of the 2x3 switch arrangement is shown, and (b) shows the case of the 3x2 switch arrangement.
12 is a diagram showing the voltage difference between the normal key and the virtual key in a state in which the pull-up resistor Rp is 1.5 ㏀ in the experiment circuit of FIG. 10, and (a) is a switch arrangement of 2 × 2 and 2 × 3. (B) shows the case of a 3x2 switch arrangement.
13 is a view showing a hardware configuration for implementing a virtual key phenomenon removal method of an infrared remote control with a rubber contact switch according to an embodiment of the present invention.
14 is an on-array table used for on or off switch processing.
15A and 15B are flowcharts for explaining a virtual key removal method of an infrared remote control with a rubber contact switch according to an embodiment of the present invention.
FIG. 16 is a detailed flowchart of the off-switch processing step (S80) of FIG. 15A.
17 is a detailed flowchart of the on-switch processing step (S90) of FIG. 15A.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Rubber contact switch]

Before describing the present invention, a rubber contact switch to which the present invention is applied will be described.

Figure 2 is a view showing the structure of a rubber contact switch to which the present invention is applied, the rubber contact switch is a conductive rubber is attached to the body made of non-conductive rubber, and when the user presses the upper side, the conductive rubber is on the contact formed on the PCB substrate It acts as a switch on the principle of contact.

This type of switch is mainly used for remote controls, electronic calculators, game machines, electronic dictionaries, keyboard musical instruments for toys, etc. due to the simplicity of structure and high-density production in the same area and low production cost. .

The biggest advantage of this type of switch is that it can be manufactured at a very low price, so adding a large number of diodes or resistors can be a relatively large cost increase factor.

Since the rubber contact switch uses a conductive rubber as a conductor, it has its own inherent resistance, and the smaller the resistance, the better the switch, but if configured in this way, the price increases significantly, allowing some resistance, and instead pull-up The resistance is selected to be a large value of 100 ㏀ level, so that a certain amount of contact resistance can be neglected, and the principle for this is shown in FIG. 4.

The conductive rubber of the rubber contact switch generally has a very large intrinsic resistance ranging from a few 100 Ω to several ㏀, and if the switch contact resistance (Rsw) is 1 ㏀, the pull-up resistance (Rp) as shown in Fig. 4 (a). If 5㏀ is not much larger than the rubber contact resistance, then the voltage (Vo) at this time is quite high as shown in [Equation 1] below.

[Equation 1]

This voltage is almost 20% of the power supply voltage, and it is difficult to detect this voltage as 0V, which is the 'L' level, and is detected as unstable. On the other hand, if a pull-up resistor (Rp) of 100 훨씬 is much larger than the switch contact resistance (Rsw) as shown in FIG. 4 (b), a low voltage as shown in the following [Equation 2] appears to detect this. With MICOM, a stable detection value can be obtained.

[Equation 2]

Therefore, in general, the pull-up resistor in the remote control uses a very large value to solve the problem of instability caused by the inherent resistance, which is a disadvantage of the rubber contact switch.

In the present invention, rather, the inherent resistance, which is a disadvantage of the rubber contact, is intended to be used to detect the virtual key.

[How to distinguish normal key and virtual key]

Now, let's see how to distinguish between normal key and virtual key.

Interpretation of 2x2 arrays

In the case of a typical computer game, it is most likely to simultaneously press four switches of two arrow keys and two attack keys, so the analysis will be limited to the case where four switches are pressed simultaneously.

5 shows an equivalent circuit when the rubber contact switch of FIG. 2 is 2 × 2.

If the virtual key phenomenon occurs, that is, when the switches SW11, SW12, and SW21 are turned on and the switch SW22 is turned off, the equivalent circuit is shown in FIG. As shown in (a), the two detection voltages appear the same.

However, if Y2 column in which the virtual key is present is examined, the equivalent circuit is configured as shown in FIG. 6 (b), and a difference between the voltage V ₁ by the normal key and the voltage V ₂ by the virtual key occurs, and the microcomputer Can determine this voltage through analog-to-digital conversion.

The larger the difference between the normal key voltage (V ₁ ) and the virtual key voltage (V ₂ ), the more clearly the microcomputer can distinguish it, so the pull-up resistor (Rp) and switch contact characteristics that can cause the greatest voltage difference are unique. It is necessary to determine the ratio of the resistance Rsw. In the equivalent circuit of FIG. 6 (b), if the values of all the intrinsic resistors Rsw are the same and the pull-up resistors R _P are equal to each other, V ₁ and V ₂ are represented by the following [Equation 3] and [Equation 3]. 4], so the difference between the two voltages is given by [Equation 5].

[Equation 3]

[Equation 4]

[Equation 5]

To find the relationship between the switch contact intrinsic resistance (Rsw) and pull-up resistance (Rp) with the maximum voltage difference between the normal key and the virtual key, [Equation 5] is differentiated with respect to the pull-up resistance (Rp) and this is 0. If you put them together, you get the relationship as shown in [Equation 6].

[Equation 6]

FIG. 6 is a view showing an equivalent circuit when inspecting columns Y1 and Y2 of FIG. 5, (a) indicates Y1 column inspection, and (b) indicates Y2 column inspection.

Interpretation of 2x3 arrays

When four switches are simultaneously pressed in a 2 × 3 arrangement as shown in FIG. 7 (a), the equivalent circuit for this is the same as in FIG. 7 (b), which is the same as in FIG. 6, so the condition of [Equation 6] The same can be applied.

Interpretation of 3x2 array

An equivalent circuit in the case where four switches are simultaneously pressed in an array of 3 × 2 as shown in FIG. 8 and the Y2 column is examined can be represented as in FIG. 9.

In FIG. 9, if all the pull-up resistors Rp are the same and the switch contact resistors Rsw are the same, the normal key voltage V ₁ is as follows.

[Equation 7]

Meanwhile, the current I ₁ passing through the contact resistance R _sw11 of FIG. 9 may be represented as in the following [Equation 8], and thus the virtual key voltage V ₂ is in accordance with the following [Equation 9]. same.

[Equation 8]

[Equation 9]

By substituting [Equation 8] into [Equation 9] and arranging, the voltage difference between V ₂ and V ₁ can be expressed as [Equation 10] below.

[Equation 10]

By substituting [Equation 7] into [Equation 10] and arranging, the following [Equation 11] can be obtained, and the derivative of the pull-up resistance (Rp) to obtain the ratio of resistance to obtain the maximum voltage difference is obtained. If you arrange them by 0, you can find the relationship as in [Equation 12].

[Equation 11]

[Equation 12]

Selection of conditions

의 비율일 때 최대 전압차를 얻을 수 있고, 3 × 2 배열에서는 [수학식 12]로부터

의 비율일 때 최대 전압차를 얻을 수 있는 조건들이다. 그런데 키보드 전체의 스위치들에는 이들 중 한 가지 조건만을 획일적으로 적용해야 하므로 어떤 조건이 더 유리한지 선택하기 위해 각 조건들을 스위치 상태들에 대입했을 때 나타나는 전압차를 [수학식 6] 및 [수학식 12]를 이용해 다음의 [표 1]에 나타내었다. 단, 여기서 풀-업 전압(V_P)은 건전지 전압인 +3V로 가정하였다.As described above, in the 2 × 2, 2 × 3 arrangement, the pull-up resistor (R _P ) and the contact resistance (R _SW ) are from [Equation 6].

The maximum voltage difference can be obtained at the ratio of, and in the 3 × 2 array, from [Equation 12]

It is a condition to obtain the maximum voltage difference when the ratio of. However, since only one of these conditions must be uniformly applied to the switches of the entire keyboard, the voltage difference that appears when each condition is substituted into the switch states to select which condition is more advantageous is expressed by [Equation 6] and [Equation]. 12] is shown in the following [Table 1]. However, it is assumed here that the pull-up voltage V _P is the battery voltage + 3V.

[Table 1]

조건은 3 × 2 배열에 적용했을 때 전압차가 가장 크게 나타나지만, 2 × 2 배열에서는 가장 작은 값이 나타난다. 이에 비해

조건은 비록

조건에서의 최대값보다는 작지만 최소값보다는 크게 나타나므로

조건을 적용하는 것이 더 유리함을 알 수 있다.[Table 1]

The condition shows the largest voltage difference when applied to a 3x2 array, but the smallest value appears in a 2x2 array. In comparison

Although the condition

It is smaller than the maximum value in the condition, but it appears larger than the minimum value.

It can be seen that it is more advantageous to apply the conditions.

조건을 대입했을 때 발생하는 전압과 전압차의 시뮬레이션 결과를 나타내었다.Table 2 shows the states of the switches.

The simulation results of the voltage and voltage difference generated when the condition is applied are shown.

[Table 2]

[Determination of experimental results and boundary values]

Experiment and results

In order to confirm the effect of the virtual key detection method presented above, as shown in FIG. 10, a remote control composed of a rubber contact switch was modified to construct an experimental circuit. The resistance of the rubber contact used in the experiment was about 1.1 평균 on average as a result of the measurement. Therefore, the pull-up resistance was 1.5 ㏀ according to the condition of [Equation 6].

FIG. 11 shows X2 in the 2 X 2 array of FIG. 5 and 3 X 2 array of FIG. 8, using the pull-up resistor (Rp) 110 인, which is 100 times the rubber contact resistance, which is a ratio generally used in the remote control. It can be seen that the virtual key cannot be detected because only a very small difference occurs when the switch is actually pressed and when the switch is actually pressed.

On the other hand, FIG. 12 is a case where Rp = 1.5 인, which is the ratio obtained in [Equation 6], is applied, and the voltage difference between the normal key and the virtual key in both 2 × 2 and 3 × 2 arrays can be easily distinguished with the naked eye. .

According to the above experimental results, it can be seen that the virtual key can be easily detected and removed by detecting the voltage using Micom's analog-to-digital conversion.

Boundary value setting

According to the above experimental results, it is possible to determine the boundary value of whether the currently detected voltage is a normal key or a virtual key.

In Table 2, the normal key voltage average is 1.453V, and the virtual key voltage average is 2.439V, so the median value of 1.946V becomes the boundary voltage. When this is converted to Micom's 8-bit analog-to-digital converter, 166, that is, 0xA6 in hexadecimal becomes a judgment boundary value. However, this is the value when the natural resistance of the rubber contact switch is about 1.1㏀.

[Example of the present invention]

13 is a view showing a hardware configuration for implementing a virtual key phenomenon removal method of an infrared remote control with a rubber contact switch according to an embodiment of the present invention.

Hardware for implementing the virtual key phenomenon removal method of the infrared remote control with a rubber contact switch according to an embodiment of the present invention, as shown in Figure 13, the microcomputer 100, the matrix type keypad 200 and infrared LED (310, 320).

The microcomputer 100 is capable of data communication with each other through a matrix-type keypad 200 and a row input port and a column port, and serves to control all components of the present invention.

The matrix-type keypad 200 refers to a keypad in which a plurality of switches are arranged in a matrix form, and exchanges data with the microcomputer 100.

The infrared LEDs 310 and 320 receive digital signals from the microcomputer 100 and transmit them in the form of infrared rays.

A method of removing the virtual key phenomenon of the infrared remote controller having the rubber contact switch according to the embodiment of the present invention using the hardware of the remote control having the rubber contact switch configured as described above will be described.

15A and 15B are flowcharts for explaining a method of removing a virtual key phenomenon of an infrared remote control having a rubber contact switch according to an embodiment of the present invention, where S denotes a step.

First, when power is supplied to the microcomputer 100 and reset occurs, hardware initialization including setting the input and output directions of the row input port and the column port is performed (S10).

Subsequently, the microcomputer 100 initializes a variable including a variable in an ON array that stores a timer variable indicating a row, column number, and auto repeat state of the switch in which the ON operation is performed. (S20).

In order to implement the method of the present invention, in the case of an infrared remote controller equipped with a rubber contact switch, four or more switches must be processed at the same time, and if the switch is continuously operated, the same signal is automatically generated. Switches that are determined to have been turned on because they have to be repeated (auto-repeat) use the on-array table as shown in FIG. 14 to set the timer number indicating the row number of the switch and the auto-repeat state of the switch. To save.

Subsequently, the microcomputer 100 initializes the column counter (S30), outputs a low signal to the port of the switch row to be inspected of the keypad 200 (S40), and outputs the switch row that received the low signal to the microcomputer ( 100) so that the port of the corresponding switch column is set to the output direction (S50).

Subsequently, the microcomputer 100 initializes the row counter (S60), checks whether or not the switch corresponding to the current column and row is registered in the on-array table shown in FIG. 14 (S70), and step (S70). ), If a switch corresponding to the current column and row is registered (YES), since the switch has been operated from before, processing for the on switch is performed (S90).

Step S90 will be described in detail with reference to FIG. 17.

First, the microcomputer 100 performs analog-to-digital conversion of the input voltage from the switch corresponding to the current column and row (S91), and checks whether the digital conversion value is less than or equal to the boundary value (S92).

If the digital conversion value in the step (S92) is less than or equal to the boundary value (YES), since the corresponding switch is still pressed, the microcomputer 100 decreases the timer variable of this switch by 1 (S93), and the timer variable of the corresponding switch It is determined whether or not is 0 (S94).

In step S94, if the timer variable of the corresponding switch is not 0 (NO), the operation ends.

On the other hand, if the timer variable of the corresponding switch is 0 in the step S94 (YES), the microcomputer 100 resets the timer variable for the next auto repeat of the switch (S95), and corresponds to the corresponding switch. After transmitting the digital code through the infrared LED (310, 320) (S96), the operation ends.

On the other hand, if the digital conversion value in the step (S92) is greater than the boundary value (NO), the microcomputer 100 removes the row number of the current switch from the on array (S97), and then delays the set time to remove chattering. (S98), the operation ends.

Subsequently, when step S90 is completed, the microcomputer 100 decrements the row counter for processing of the next switch (S100), and checks whether it is the end of the row (S110).

In step S110, if the end of the row (YES), the microcomputer 100 sets the port direction of the current column as an input so that the port pins float (S120), and decreases the column counter (S130).

Subsequently, the microcomputer 100 checks whether the current column is the end (S140).

In step S140, if the current column ends (YES), the process proceeds to step S30, while when the current column does not end (NO), the process proceeds to step S40.

On the other hand, if it is not the end of the row in step S110 (NO), the process proceeds to step S70.

On the other hand, if the switch corresponding to the current column and row is not registered in the on-array in step S70 (NO), since it is a switch operated before, the micom 100 processes the off switch. After performing (S80), the process proceeds to step S100.

The step S80 will be described with reference to FIG. 16.

First, the microcomputer 100 performs analog-to-digital conversion of the input voltage from the switch corresponding to the current column and row (S81), and checks whether the digital conversion value is less than or equal to the boundary value (S82).

If the digital conversion value is greater than the boundary value in step S82 (NO), the operation ends.

On the other hand, if the digital conversion value in the step (S82) is less than or equal to the boundary value (YES), the corresponding switch is on, so the microcomputer 100 registers the row number of the switch in the on-array (S83), After initializing the timer variable of the switch (S84), the digital code corresponding to the switch is transmitted through the infrared LEDs (310, 320) (S85), and the chattering that occurs at this time is removed because the switch is newly pressed. To delay the time for a while (S86), the operation ends.

On the other hand, according to an embodiment of the present invention, the method for removing the virtual key phenomenon of the infrared remote control with the rubber contact switch is not only the infrared remote control but also other devices using the rubber contact switch, for example, an electronic calculator, a toy keyboard musical instrument, a game joypad, It can be applied to all rubber contact keyboards of small computers.

According to the embodiment of the present invention configured as described above, according to the virtual key removal method of the infrared remote control with a rubber contact switch, when power is supplied to the microcomputer and reset occurs, the input and output of the row input port and the column port are generated. Hardware initialization including the direction setting is performed (S10); Initializing a variable including a variable in an ON array that stores a timer variable indicating a row, column number, and auto repeat state of the switch in which the microcomputer is turned on (S20). ; Initializing a heat counter by the microcomputer (S30); Outputting a low signal to a port of a switch row to be inspected by the microcomputer (S40); The micom setting a port of the corresponding switch row in the output direction so that the output of the switch row receiving the low signal can be output to the micom (S50); Initializing a row counter by the microcomputer (S60); Checking whether the microcomputer is registered in an on-array switch corresponding to the current column and row (S70); If a switch corresponding to the current column and row is registered in the registration confirmation step (S70), since the switch has been operated on before, performing a process for the on switch by the microcomputer (S90); When the processing for the on-switch is completed, the microcomputer decrementing a row counter for processing of the next switch (S100); Checking whether the micom is the end of a row (S110); If it is the end of the line in the checking whether the end of the line (S110), setting the port direction of the current column as an input by the micom so that the port pin is floated (S120); Decreasing the heat counter by the microcomputer (S130); And a step (S140) of checking whether the current column is the end by the microcomputer; initializing a column counter by the microcomputer when the current column is finished in the step (140) of checking whether the current column is over or not. Proceeding to (S30); by being configured to eliminate the virtual key phenomenon by using the characteristics of the rubber contact switch without additional hardware.

In more detail, according to an embodiment of the present invention, according to a method for removing a virtual key phenomenon of an infrared remote control having a rubber contact switch, the virtual resistance of the contact part known as a disadvantage of the rubber contact switch is reversely used to generate the virtual key. The method to be used for the detection of was proposed, and accordingly, by adjusting only the values of the pull-up resistors used in the existing remote control without adding additional hardware, the voltages generated when the normal key and the virtual key are different are finally configured. As a result, the micom can remove the virtual key by converting this voltage to analog-digital conversion and processing only the normal key.

In the drawings and the specification, an optimal embodiment has been disclosed, and specific terms have been used, but this is only for the purpose of describing the embodiments of the present invention, and is used to limit the meaning or limit the scope of the present invention described in the claims. It is not done. Therefore, those skilled in the art will appreciate that various modifications and other equivalent embodiments are possible. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: microcomputer
200: matrix type keypad
310, 320: infrared LED

Claims (6)

A keypad 200 in which a plurality of switches are arranged in a matrix form, a micom 100 capable of data communication through the keypad and a row input port and a column port, and an infrared LED that receives digital signals from the micom and transmits them in infrared form ( 310, 320), as a method of removing the virtual key phenomenon of the infrared remote control having a rubber contact switch,
A step of performing hardware initialization including setting the input and output directions of the row input port and the column port (S10) when reset occurs when power is supplied to the microcomputer;
Initializing a variable including a variable in an ON array that stores a timer variable indicating a row, column number, and auto repeat state of the switch in which the microcomputer is turned on (S20). ;
Initializing a heat counter by the microcomputer (S30);
Outputting a low signal to a port of a switch row to be inspected by the microcomputer (S40);
The microcomputer setting the port of the corresponding switch row in the output direction so that the output of the switch row receiving the low signal can be output to the microcomputer (S50);
Initializing a row counter by the microcomputer (S60);
Checking whether the switch corresponding to the current column and row is registered in the on-array (S70);
If the switch corresponding to the current column and row is registered in the registration confirmation step (S70), since the switch has been operated on before, performing a process for the on switch by the microcomputer (S90);
When the processing for the on-switch is completed, the microcomputer decrementing a row counter for processing of the next switch (S100);
Checking whether the micom is the end of a row (S110);
If it is the end of the line in the checking whether the end of the line (S110), setting the port direction of the current column as an input by the micom so that the port pin is floated (S120);
Decreasing the heat counter by the microcomputer (S130); And
Including the step of checking whether the current column is the end by the microcomputer (S140);
If the current column ends in the checking whether the end of the column (S140), the process proceeds to the step (S30) of initializing the column counter by the micom,
If the switch corresponding to the current column and row is not registered in the registration confirmation step (S70), it is a switch that has been operated off before (S80). Includes,
After the off-switch processing step (S80), the method proceeds to the row counter reduction step (S100), a method for removing the virtual key phenomenon of the infrared remote control with a rubber contact switch. delete According to claim 1,
If the current column is not the end in the checking whether the end of the column (S140), the process proceeds to the low signal output step (S40), a virtual key removal method of the infrared remote control with a rubber contact switch. According to claim 1,
If it is not the end of the line in the step (S110) of checking whether the end of the line, proceed to the step of checking whether the registration (S70), the virtual key removal method of the infrared remote control with a rubber contact switch. According to claim 1,
The on-switch processing step (S90),
An analog-digital conversion of the input voltage from the switch corresponding to the current column and row by the microcomputer (S91);
Checking whether the digital conversion value is less than or equal to a boundary value by the microcomputer (S92);
If the digital conversion value is less than or equal to the boundary value, the corresponding switch is still depressed, so the timer variable of the switch is decreased by 1 by the microcomputer (S93);
Determining whether the timer variable of the switch is 0 by the microcomputer (S94);
In step S94, if the timer variable of the switch is not 0, the timer variable is terminated when the timer variable of the switch is 0, and if the timer variable of the switch is 0, the timer variable for the next auto repeat of the switch by the microcomputer. Resetting (S95);
The microcomputer transmitting a digital code corresponding to the switch through infrared LEDs 310 and 320 (S96);
If the digital conversion value is greater than the boundary value in the checking whether the digital conversion value is less than or equal to the boundary value (S92), the microcomputer removes the row number of the current switch from the array (S97); And
Including the step of delaying the microcomputer for a predetermined time to remove chattering (S98); including, the virtual key removal method of the infrared remote control with a rubber contact switch. According to claim 1,
The off (Off) switch processing step (S80),
An analog-digital conversion of the input voltage from the switch corresponding to the current column and row by the microcomputer (S81);
Checking whether the digital conversion value is less than or equal to a boundary value by the microcomputer (S82);
When the digital conversion value is greater than the boundary value, the process is terminated. If the digital conversion value is less than or equal to the boundary value, the corresponding switch is depressed. Then, by the microcomputer, registering the row number of the switch to the on array (S83);
Initializing the timer variable of the switch by the microcomputer (S84);
The microcomputer transmitting the digital code corresponding to the switch through the infrared LED (310, 320) (S85); And
Since the switch is in a newly pressed state, delaying for a predetermined time by the microcomputer (S86) in order to remove chattering occurring at this time, including; Virtual image removal method of the infrared remote control with a rubber contact switch .

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