CN103701472A - Digital keying circuit and keying equipment - Google Patents
Digital keying circuit and keying equipment Download PDFInfo
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- CN103701472A CN103701472A CN201310561427.4A CN201310561427A CN103701472A CN 103701472 A CN103701472 A CN 103701472A CN 201310561427 A CN201310561427 A CN 201310561427A CN 103701472 A CN103701472 A CN 103701472A
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Abstract
The invention discloses a digital keying circuit and keying equipment. The circuit comprises a key rheostatic unit and an analog-digital conversion module, wherein the resistance value of the key rheostatic unit correspondingly changes when any of different keys is correspondingly pressed or multiple keys in different combinations are pressed at the same time; one end of the key rheostatic unit is connected with a power supply, and the other end of the key rheostatic unit is grounded; the analog-digital conversion module is connected with the key rheostatic unit and is used for acquiring the corresponding voltage values corresponding to different resistance values at the connection part, and the corresponding voltage values are used for judging the state of the key. The keying equipment is provided with the digital keying circuit. According to the digital keying circuit, the state of the key is judged by detecting the variation of the voltage value, so that the problem of mistaken detection is effectively avoided. The keying equipment provided by the invention effectively avoids the problem of a Ghost key.
Description
Technical field
The present invention relates to circuit engineering field, relate in particular to a kind of digital keys circuit, this digital keys circuit can effectively avoid pressing the error detection phenomenon of a plurality of buttons simultaneously, and relates to a kind of press key equipment with described digital keys circuit.
Background technology
Along with the development of electronic product, various and the people closely bound up product of living has also all entered the intelligent epoch, such as smart mobile phone, and pad, intelligent television etc.Round the periphery accessory product of smart machine be also the people that occur like the mushrooms after rain at the moment.
Aspect intelligent artifact peripheral hardware and accessory, much need digital keys to realize, such as mouse, keyboard, gamepad(game paddle).These most products, because function is limited, the data volume gathering can not done processing conventionally yet, be all that initial data is uploaded to host(main frame) go to process, therefore do not need high performance MCU(microprocessing unit) go to control, thus be all at present the MCU of the low performance of employing, and the MCU of low performance can run into a more awkward situation, it is not enough that is exactly pin pin number, is difficult to meet the detection of simultaneously pressing for combination button.
Specifically, for the design of button, probably there are two kinds of ways in the market:
The first, each button detects by an independent IO, the benefit of this way is to detect accurately, but shortcoming is apparent, can use too much IO, as fruit product to press key definition too much, such as keyboard, IO is certain to occur not enough phenomenon, so this scheme is very impracticable in actual product.
The second, the method demultiplexing that adopts matrix keyboard, this is also the most general in the market way.The advantage of this way can make full use of IO exactly, but shortcoming can produce button conflict phenomenon exactly, and error detection phenomenon occurs.No matter while being document process or game operation, often use a plurality of key combination to press together, error detection phenomenon now easily occurs, show as, for example, when supressing two keys, then when pressing the 3rd key without any reaction, again for example, when three buttons are pressed simultaneously, the 4th button, even without pressing, also can be measured and press by flase drop, is commonly called as Ghost Key (ghost).This is unallowed in application, can cause misoperation.Three buttons of take are as follows pressed as example simultaneously and are described in conjunction with Fig. 2～Fig. 4:
Matrix form button design principle shown in Figure 2, take 2 * 2 as example, and two row two row can be realized 4 buttons, and shown position is that 4 buttons are not all pressed, now all not conductings.
Referring to Fig. 3, if press Q key, from C1, start scanning, R1 is switched on, and R2 does not have, so detect C1R1, is pressed; From C2 scanning, R1 and R2 do not form path again; So conclusion obtains only having C1R1, Q key is triggered.
Referring to Fig. 4, when Q, W, A are pressed simultaneously: start scanning from C1, R1 is switched on, and R2 is also switched on, so detect C1R1, C1R2 is pressed; From C2, start scanning again, R1 is switched on, and now R2 is also switched on by C1, so C2R1, C2R2 detected, all forms path; Conclusion obtains C1R1, C1R2, C2R1, C2R2, and Q key, W key, A key, S key are all triggered.Yet actual really not so, S key is not pressed unexpected being switched on, and this key is Ghost key (Ghost Key).
Referring to Fig. 5, the ghost key problem based on described, also someone has proposed new design, on the loop of each button, adds diode, prevents electric current adverse current, avoids error detection.Although this method can be avoided ghost problem, need to increase a large amount of diodes, cost is high, also inapplicable in production application.
To sum up, adopt the method for designing of matrix form button, due to the design defect of itself, cannot avoid the defect of error detection; And adopt button and IO corresponding scheme one by one, and the employing matrix form key circuit scheme of setting up diode, circuit complexity and high cost, poor practicability, is difficult to apply on a large scale on the equipment of many buttons.Based on this, the present invention, on the basis of guaranteeing that circuit is simple and controlling cost, provides a kind of digital keys circuit that can effectively avoid error detection.
Summary of the invention
The object of the invention is to disclose a kind of digital keys circuit, by detecting magnitude of voltage, change to judge key-press status, effectively avoided the problem of error detection.
The present invention also aims to disclose a kind of press key equipment, this equipment adopts described digital keys circuit, has effectively avoided the problem of Ghost key.
The first object based on above-mentioned, the invention provides a kind of digital keys circuit, and for having the press key equipment of an above button, to avoid pressing the error detection phenomenon of a plurality of buttons simultaneously, described circuit comprises button variable resistance unit and analog-to-digital conversion module, wherein:
Described button variable resistance unit is set to, and when correspondence is pressed different arbitrary buttons, or a plurality of buttons of various combination are when press simultaneously, and the resistance correspondence of described button variable resistance unit changes;
One end of described button variable resistance unit connects power supply, other end ground connection;
Described analog-to-digital conversion module connects described button variable resistance unit, and for gathering junction corresponding to the relevant voltage value of different resistances, described relevant voltage value is for judging the state of button.
Preferably, described button variable resistance unit comprises reference resistance and variable resistance module, wherein:
Described variable resistance module is set to, and when correspondence is pressed different arbitrary buttons, or a plurality of buttons of various combination are when press simultaneously, and the resistance correspondence of described variable resistance module changes;
One end of described variable resistance module connects respectively described reference resistance and described analog-to-digital conversion module, other end ground connection;
Described reference resistance connects power supply.
Preferably, described variable resistance module comprises an above key switch and an above button resistance, and a described above key switch is in parallel and is connected one to one with a described above button resistance, between a described above button resistance, is connected in series.
Preferably, described variable resistance module comprises two key switches and two button resistance.
Preferably, the resistance value ratio of the button resistance of described reference resistance, the button resistance being connected with reference resistance, ground connection is 2:1:2.
Preferably, described variable resistance module comprises three key switches and three button resistance.
Preferably, described reference resistance, the button resistance being connected with described reference resistance, with the button resistance that the button resistance of ground connection is connected, the resistance value ratio of the button resistance of ground connection is 3:1:2:5.
Preferably, described variable resistance module comprises a fixed value resistance, an above key switch and an above button resistance, a described above key switch is in series and is connected one to one with a described above button resistance, the button resistance of connecting described in each key switch and its forms respectively a branch road, and a described fixed value resistance and parallel with one another connection between branch road described in each.
The second object based on above-mentioned, the invention provides a kind of press key equipment, and described press key equipment has described digital keys circuit.
Preferably, the analog-to-digital conversion module interface of described digital keys circuit accesses the MCU of described press key equipment.
In sum, digital keys circuit provided by the invention, any one key-press status all can corresponding resistance respective change, and then the magnitude of voltage that causes specific Nodes (being the junction of analog-to-digital conversion module and button resistance unit) changes thereupon, the present invention is by the magnitude of voltage of this variation being detected, judge corresponding key-press status, detect the design of conducting state than existing matrix form key circuit, the present invention has effectively avoided the phenomenon of error detection.
Further, digital keys circuit of the present invention, only adopt an analog-to-digital conversion module (ADC, be Analog to Digital Converter) match with the resistance corresponding to key switch, can complete the judgement of key-press status, cost than existing matrix form key circuit does not almost increase, and than the existing key circuit that is combined with a large amount of diodes, the circuit layout that the present invention has lower cost and more optimizes.
The present invention also provides a kind of press key equipment, and this equipment adopts digital keys circuit of the present invention, has the beneficial effect of the error detection avoided, and then has fully solved the problem of Ghost key.
Accompanying drawing explanation
Fig. 1 is existing matrix form key circuit schematic diagram;
Fig. 2 is the partial schematic diagram (left figure represents key-press status, and right figure represents corresponding on off state) of existing matrix form key circuit;
Fig. 3 is the view (left figure represents key-press status, and right figure represents corresponding on off state) that Q key is pressed;
Fig. 4 is the view (illustrating corresponding on off state) that Q, S, A key are pressed together;
Fig. 5 is the matrix form key circuit partial schematic diagram that has additional diode;
Fig. 6 is the theory diagram of digital keys circuit of the present invention;
Fig. 7 is the theory diagram of embodiments of the invention one;
Fig. 8 is embodiments of the invention two circuit diagrams;
Fig. 9 is embodiments of the invention three-circuit schematic diagram;
Figure 10 is embodiments of the invention four circuit diagrams.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Referring to Fig. 6, the invention provides a kind of digital keys circuit, be mainly used in having the press key equipment of an above button, as for keyboard, mouse, game paddle etc.This digital keys main circuit will comprise button variable resistance unit R and analog-to-digital conversion module ADC.Described button variable resistance unit R is preferably set to, when correspondence is pressed different arbitrary buttons, or when a plurality of buttons of various combination are pressed simultaneously, the resistance correspondence of described button variable resistance unit R changes, that is to say, the resistance of described button variable resistance unit R changes along with different key-press status.Described analog-to-digital conversion module ADC connects described button variable resistance unit R.
When pressing different one keys, or while pressing a plurality of button of various combination, the resistance of described button variable resistance unit R changes, the magnitude of voltage that will inevitably cause the junction of described analog-to-digital conversion module ADC and described button variable resistance unit R changes, the present invention relies on the characteristic that analog-to-digital conversion module ADC can instantaneous acquiring magnitude of voltage, the magnitude of voltage of junction is carried out to real-time detection, according to the different magnitudes of voltage that collect, can judge corresponding key-press status.Obviously, the present invention gathers the variation of magnitude of voltage by analog-to-digital conversion module ADC, and judges accordingly the scheme of key-press status, because each magnitude of voltage corresponds respectively to a kind of key-press status, therefore, there will not be the fault of error detection, improved accuracy and the practicality of digital keys circuit.And the present invention adopts an analog-to-digital conversion module ADC to coordinate resistance, can complete the detection operation of key-press status, circuit is simple and cost is low, is convenient to apply on a large scale on each keyboard equipment.
Embodiment mono-
Referring to Fig. 7, the present embodiment one provides a kind of preferred version of digital keys circuit, the magnitude of voltage that this scheme can make analog-to-digital conversion module ADC collect is more regular and easier analytic operation, on the basis without error detection, further improves the accuracy of judging key-press status.Particularly:
Described digital keys main circuit will comprise button variable resistance unit R and analog-to-digital conversion module ADC.Described button variable resistance unit R is preferably set to: described button variable resistance unit R comprises reference resistance R
awith variable resistance module R
x, correspondence is pressed different arbitrary buttons, or a plurality of buttons of various combination are when press simultaneously, described variable resistance module R
xresistance correspondence change, that is to say described variable resistance module R
xresistance along with different key-press status, change; Described variable resistance module R
xone end connect respectively described reference resistance R
awith described analog-to-digital conversion module ADC, other end ground connection; Described reference resistance R
aconnect power supply.
Described analog-to-digital conversion module ADC gathers described reference resistance R
aanode-cathode voltage value, illustrate the magnitude of voltage of right-hand member, the computational methods of this magnitude of voltage are:
Embodiment bis-
Referring to Fig. 8, this embodiment is on the basis of embodiment mono-, and for the preferred design of two buttons, the disclosed technical scheme of embodiment mono-also belongs to the present embodiment, and the disclosed technical scheme of embodiment mono-is no longer repeated in this description.Particularly:
Described digital keys main circuit will comprise button variable resistance unit R and analog-to-digital conversion module ADC.Described button variable resistance unit R is preferably set to: comprise reference resistance R
awith two button resistance R
band R
c, and comprise two key switch K
1and K
2.Described reference resistance R
a, button resistance R
bwith button resistance R
cconnection in sequential series, described key switch K
1with described button resistance R
bbe connected in parallel, described key switch K
2with described button resistance R
cbe connected in parallel, described button resistance R
cground connection, described reference resistance R
aone end connect power supply V
cC, the other end connects respectively described analog-to-digital conversion module ADC and described button resistance R
b.
Described reference resistance R
a, described button resistance R
bwith described button resistance R
cresistance can be according to needs set flexibly, as long as meet when press any button and while pressing two buttons simultaneously, the corresponding difference of magnitude of voltage that described analog-to-digital conversion module ADC gathers, for example, can be set as: described reference resistance R
a, button resistance R
bwith button resistance R
cresistance value ratio be 2:1:2.
The key-press status decision procedure of the described digital keys circuit of this embodiment is:
1, as key switch K
1with key switch K
2while all disconnecting, two buttons are not all pressed, and the magnitude of voltage that now analog-to-digital conversion module ADC collects is:
2, as key switch K
1closed, key switch K
2during disconnection, while only having first button to press, described button resistance R
bshort circuit, the magnitude of voltage that now analog-to-digital conversion module ADC collects is:
3, as key switch K
1disconnection, key switch K
2when closed, while only having second button to press, described button resistance R
cshort circuit, the magnitude of voltage that now analog-to-digital conversion module ADC collects is:
4, as key switch K
1with key switch K
2when all closed, when two buttons are all pressed, described button resistance R
bwith button resistance R
call short circuits, analog-to-digital conversion module ground connection now, its magnitude of voltage collecting is:
U
ADC＝GND。
In sum, the magnitude of voltage of 4 kinds of key-press status is not identical, therefore, the problem of error detection can not occur.
Embodiment tri-
Referring to Fig. 8, this embodiment is on the basis of embodiment mono-, and for the preferred design of three buttons, the disclosed technical scheme of embodiment mono-also belongs to the present embodiment, and the disclosed technical scheme of embodiment mono-is no longer repeated in this description.Particularly:
Described digital keys main circuit will comprise button variable resistance unit R and analog-to-digital conversion module ADC.Described button variable resistance unit R is preferably set to: comprise reference resistance R
awith three button resistance R
b, R
cand R
d, and comprise three key switch K
1, K
2and K
3.Described reference resistance R
a, button resistance R
b, button resistance R
cwith button resistance R
dconnection in sequential series, described key switch K
1with described button resistance R
bbe connected in parallel, described key switch K
2with described button resistance R
cbe connected in parallel, described key switch K
3with described button resistance R
dbe connected in parallel, described button resistance R
dground connection, described reference resistance R
aone end connect power supply V
cC, the other end connects respectively described analog-to-digital conversion module ADC and described button resistance R
b.
Described reference resistance R
a, described button resistance R
b, described button resistance R
cwith described button resistance R
dresistance can be according to needs set flexibly, as long as meet when pressing any button, or while pressing two buttons of combination in any simultaneously, or while pressing three buttons simultaneously, the magnitude of voltage that described analog-to-digital conversion module gathers is corresponding different, for example, can be set as: described reference resistance R
a, described button resistance R
b, described button resistance R
cwith described button resistance R
dresistance value ratio be 3:1:2:5.
The key-press status decision procedure of the described digital keys circuit of this embodiment, identical with the decision procedure of embodiment bis-, comprise altogether key-press status in 8:
1, key switch K
1, key switch K
2with key switch K
3all disconnect, the magnitude of voltage that now analog-to-digital conversion module collects is:
2, key switch K
1disconnection, key switch K
2with key switch K
3when closed, the magnitude of voltage that now analog-to-digital conversion module collects is:
3, key switch K
2disconnection, key switch K
1with key switch K
3when closed, the magnitude of voltage that now analog-to-digital conversion module collects is:
4, key switch K
3disconnection, key switch K
1with key switch K
2when closed, the magnitude of voltage that now analog-to-digital conversion module collects is:
5, key switch K
1with key switch K
2disconnection, key switch K
3closure, the magnitude of voltage that now analog-to-digital conversion module collects is:
6, key switch K
1with key switch K
3disconnection, key switch K
2closure, the magnitude of voltage that now analog-to-digital conversion module collects is:
7, key switch K
2with key switch K
3disconnection, key switch K
1closure, the magnitude of voltage that now analog-to-digital conversion module collects is:
8, key switch K
1, key switch K
2with key switch K
3all closed, the magnitude of voltage that now analog-to-digital conversion module collects is:
U
ADC＝GND。
In sum, the magnitude of voltage of 8 kinds of key-press status is not identical, therefore, the problem of error detection can not occur.
Above embodiment bis-and embodiment tri-are only preferred scheme, and the setting of its resistance can be carried out suitable variation, and, can, according to the principle of embodiment bis-and embodiment tri-, expand and be set to the digital keys circuit on quadruple linkage and quadruple linkage.
Embodiment tetra-
Referring to Figure 10, this embodiment is on the basis of embodiment mono-, and for another preferred design of three buttons, the disclosed technical scheme of embodiment mono-also belongs to the present embodiment, and the disclosed technical scheme of embodiment mono-is no longer repeated in this description.Particularly:
Described digital keys main circuit will comprise button variable resistance unit R and analog-to-digital conversion module ADC.Described button variable resistance unit R is preferably set to: comprise a fixed value resistance R
0, a reference resistance R
awith three button resistance R
b, R
cand R
d, and comprise three key switch K
1, K
2and K
3.Described reference resistance R
aone end connect power supply, the other end connects respectively described analog-to-digital conversion module ADC, described button resistance R
b, described button resistance R
c, described button resistance R
dwith described fixed value resistance R
0, described fixed value resistance R
0ground connection, described button resistance R
bby described key switch K
1ground connection, described button resistance R
cby described key switch K
2ground connection, described button resistance R
dby described key switch K
3ground connection.
Each button resistance in this embodiment is in parallel, by the resistance value ratio of setting between reference resistance, fixed value resistance and each button resistance, be listed as, can meet equally, when pressing any button, and when pressing the button of combination in any, the magnitude of voltage that described analog-to-digital conversion module ADC detects is different, judges accordingly the state of button.
The Application Example of press key equipment
Digital keys circuit of the present invention can be applicable to various press key equipments, during design and installation, as long as digital keys circuit of the present invention is accessed in described press key equipment.Wherein, the ADC interface of described digital keys circuit accesses the MCU of described press key equipment, and the voltage signal values collecting is sent into MCU, by MCU, judges accordingly key-press status, and the result of judgement is delivered to corresponding Executive Module by corresponding peripheral circuit.From aforesaid embodiment, digital keys circuit of the present invention has the feature of the error detection avoided, and therefore, the press key equipment of described digital keys circuit is installed, and can effectively avoid the appearance of Ghost key.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. a digital keys circuit, for having the press key equipment of an above button, to avoid pressing the error detection phenomenon of a plurality of buttons simultaneously, is characterized in that,
Described circuit comprises button variable resistance unit and analog-to-digital conversion module, wherein:
Described button variable resistance unit is set to, and when correspondence is pressed different arbitrary buttons, or a plurality of buttons of various combination are when press simultaneously, and the resistance correspondence of described button variable resistance unit changes;
One end of described button variable resistance unit connects power supply, other end ground connection;
Described analog-to-digital conversion module connects described button variable resistance unit, and for gathering junction corresponding to the relevant voltage value of different resistances, described relevant voltage value is for judging the state of button.
2. digital keys circuit according to claim 1, is characterized in that, described button variable resistance unit comprises reference resistance and variable resistance module, wherein:
Described variable resistance module is set to, and when correspondence is pressed different arbitrary buttons, or a plurality of buttons of various combination are when press simultaneously, and the resistance correspondence of described variable resistance module changes;
One end of described variable resistance module connects respectively described reference resistance and described analog-to-digital conversion module, other end ground connection;
Described reference resistance connects power supply.
3. digital keys circuit according to claim 2, it is characterized in that, described variable resistance module comprises an above key switch and an above button resistance, a described above key switch is in parallel and is connected one to one with a described above button resistance, between a described above button resistance, is connected in series.
4. digital keys circuit according to claim 3, is characterized in that, described variable resistance module comprises two key switches and two button resistance.
5. digital keys circuit according to claim 4, is characterized in that, the resistance value ratio of the button resistance of described reference resistance, the button resistance being connected with reference resistance, ground connection is 2:1:2.
6. digital keys circuit according to claim 3, is characterized in that, described variable resistance module comprises three key switches and three button resistance.
7. digital keys circuit according to claim 6, is characterized in that, described reference resistance, the button resistance being connected with described reference resistance, and with the button resistance that the button resistance of ground connection is connected, the resistance value ratio of the button resistance of ground connection is 3:1:2:5.
8. digital keys circuit according to claim 2, it is characterized in that, described variable resistance module comprises a fixed value resistance, an above key switch and an above button resistance, a described above key switch is in series and is connected one to one with a described above button resistance, the button resistance of connecting described in each key switch and its forms respectively a branch road, and a described fixed value resistance and parallel with one another connection between branch road described in each.
9. a press key equipment, is characterized in that, described press key equipment has the digital keys circuit as described in claim 1-9.
10. press key equipment according to claim 9, is characterized in that, the analog-to-digital conversion module interface of described digital keys circuit accesses the MCU of described press key equipment.
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| CN201310561427.4A CN103701472A (en) | 2013-11-12 | 2013-11-12 | Digital keying circuit and keying equipment |
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|---|---|---|---|
| CN201310561427.4A CN103701472A (en) | 2013-11-12 | 2013-11-12 | Digital keying circuit and keying equipment |
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| CN110033974B (en) * | 2018-01-12 | 2020-11-06 | 致伸科技股份有限公司 | Keyboard with a keyboard body |
| TWI764007B (en) * | 2019-03-29 | 2022-05-11 | 群光電子股份有限公司 | Keyboard scanning circuit and control method thereof |
| CN112345830A (en) * | 2020-10-30 | 2021-02-09 | 厦门市三特兴电子有限公司 | Game paddle rocker circuit board resistance voltage index detection method |
| CN112345830B (en) * | 2020-10-30 | 2024-01-19 | 厦门市三特兴电子有限公司 | Game paddle rocker circuit board resistance voltage index detection method |
| CN113377575A (en) * | 2021-05-25 | 2021-09-10 | 广州朗国电子科技有限公司 | Reset circuit for forcibly resetting education all-in-one machine |
| CN113377576A (en) * | 2021-06-01 | 2021-09-10 | 广州朗国电子科技有限公司 | Reset control method, equipment and storage medium of education all-in-one machine |
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