CN207782765U - A kind of key press detecting circuit being integrated with ambient brightness detection - Google Patents
A kind of key press detecting circuit being integrated with ambient brightness detection Download PDFInfo
- Publication number
- CN207782765U CN207782765U CN201820193149.XU CN201820193149U CN207782765U CN 207782765 U CN207782765 U CN 207782765U CN 201820193149 U CN201820193149 U CN 201820193149U CN 207782765 U CN207782765 U CN 207782765U
- Authority
- CN
- China
- Prior art keywords
- resistance
- key
- key press
- circuit
- detecting circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Input From Keyboards Or The Like (AREA)
Abstract
The application provides a kind of key press detecting circuit being integrated with ambient brightness detection.The key press detecting circuit provided by the present application for being integrated with ambient brightness detection, including：Pull-up resistor, key-press module, luminance detection circuit and processor, wherein, the first end of the pull-up resistor is connect with constant pressure source, the second end of the pull-up resistor is grounded after being connected with the key-press module by the voltage detecting end of the key-press module, the first end of the luminance detection circuit is connect with the voltage detecting end, the second end of the luminance detection circuit is grounded, the voltage detecting end is connected to the processor, the processor, the brightness value current for determining the button or the determining key press detecting circuit local environment that are currently at pressing state according to collected voltage value.The key press detecting circuit provided by the present application for being integrated with ambient brightness detection, is integrated with the function of ambient brightness detection, can enrich the function of key press detecting circuit, saves processor resource, reduces cost.
Description
Technical field
This application involves circuit field more particularly to a kind of key press detecting circuits being integrated with ambient brightness detection.
Background technology
With the development of science and technology, push-button input device has been widely used in electronic equipment.Button inputs
Often there is device key press detecting circuit, the processor of key press detecting circuit can judge which is pressed according to collected voltage value
Key is in pressing state.
The processor of electronic equipment where the processor of key press detecting circuit is generally key press detecting circuit, button detection electricity
The other parts on road are generally connect by the ADC interface of processor with processor.However the ADC interface of processor is very limited,
And other circuits of electronic equipment are also required to realize correspondingly function by the ADC interface of processor, if key press detecting circuit energy
Other functions are enough integrated, by highly beneficial with saving processor resource.
Utility model content
In view of this, the application provides a kind of key press detecting circuit being integrated with ambient brightness detection, examined with abundant button
The function of slowdown monitoring circuit saves processor resource.
The key press detecting circuit provided by the present application for being integrated with ambient brightness detection, including it is pull-up resistor, key-press module, bright
Spend detection circuit and processor, wherein the first end of the pull-up resistor is connect with constant pressure source, the second end of the pull-up resistor
It is grounded after being connected with the key-press module by the voltage detecting end of the key-press module, the first end of the luminance detection circuit
It is connect with the voltage detecting end, the second end ground connection of the luminance detection circuit, the voltage detecting end and the processor
Connection, the processor, for determined according to collected voltage value be currently at the button of pressing state or determine it is described by
The current brightness value of key detection circuit local environment.
Further, the key-press module includes N number of button and N-1 resistance, and the first end of each button is grounded, and every two
The second end of a button is connected by a resistance, wherein the node that first button is connect with first resistance is the electricity
Test side, the node that n-th button is connect with the N-1 resistance is pressed to be connect with the first end of the luminance detection circuit.
Further, the luminance detection circuit includes a photo resistance.
Further, the luminance detection circuit further includes a divider resistance, the first end of the divider resistance with it is described
The node connection that n-th button is connect with the N-1 resistance, the second end of the divider resistance and the first of the photo resistance
End connection, the second end ground connection of the photo resistance.
Further, the key press detecting circuit further includes filter circuit, and the filter circuit setting is examined in the voltage
It surveys between end and the processor.
Further, the filter circuit includes a filter resistance and a capacitance, the first end of the filter resistance and institute
The connection of voltage detecting end is stated, the second end of the filter resistance is connect with the first end of the capacitance and the processor respectively,
The second end of the capacitance is grounded.
Further, the key press detecting circuit further includes regulator circuit, and the regulator circuit is arranged in the filtered electrical
Between road and the processor.
Further, the regulator circuit includes a Transient Suppression Diode.
Further, the N is 8.
The key press detecting circuit provided by the present application for being integrated with ambient brightness detection, by the way that pull-up resistor, button mould is arranged
Block, luminance detection circuit and processor, and the first end of pull-up resistor is connect with constant pressure source, the second end of pull-up resistor is by pressing
The voltage detecting end of key module is grounded after connecting with key-press module, and the first end of luminance detection circuit is connect with voltage detecting end,
The second end of luminance detection circuit is grounded, and voltage detecting end is connect with processor, and processor is used for according to collected voltage
Value determines the button for being currently at pressing state or determines the current brightness value of the key press detecting circuit local environment.In this way,
So that key press detecting circuit is integrated with the function of detection ambient brightness, which processor can determine according to collected voltage value
Button is in pressing state or determines the current brightness value of the key press detecting circuit local environment, in this way, button detection can be enriched
The function of circuit saves processor resource, reduces cost.
Description of the drawings
Fig. 1 is the electrical block diagram for the key press detecting circuit embodiment one that the application is integrated with ambient brightness detection；
Fig. 2 is the electrical block diagram for the key press detecting circuit embodiment two that the application is integrated with ambient brightness detection；
Fig. 3 is the application scenarios schematic diagram for the key press detecting circuit that the application is integrated with ambient brightness detection.
Reference sign：
1：Pull-up resistor；
11：The first end of pull-up resistor；
12：The second end of pull-up resistor；
2：Key-press module；
21：Voltage detecting end；
3：Luminance detection circuit；
31：The first end of luminance detection circuit；
32：The second end of luminance detection circuit；
4：Processor；
5：Filter circuit；
6：Regulator circuit.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of consistent device and method of some aspects be described in detail in claims, the application.
It is the purpose only merely for description specific embodiment in term used in this application, is not intended to be limiting the application.
It is also intended to including majority in the application and "an" of singulative used in the attached claims, " described " and "the"
Form, unless context clearly shows that other meanings.It is also understood that term "and/or" used herein refers to and wraps
Containing one or more associated list items purposes, any or all may be combined.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the application
A little information should not necessarily be limited by these terms.These terms are only used for same type of information being distinguished from each other out.
Currently, to improve user experience, certain electronic equipments usually require to adjust backlight according to ambient light brightness bright
Degree, in this way, it is necessary to detect ambient light brightness.In the prior art, to detect ambient light brightness, usually in the electronic device
Light sensation circuit is set, and the ADC interface of light sensation circuit and the processor of electronic equipment is connected, in this way, processor can be according to adopting
The voltage value collected determines the current brightness value of environment.
When electronic equipment is provided with key press detecting circuit and light sensation circuit simultaneously, key press detecting circuit and light sensation circuit are each
From the ADC interface for occupying a processor, processor resource can not be made full use of.At this point, if key press detecting circuit can collect
At the function that ambient brightness detects, this way it is not necessary to additional setting light sensation circuit again, can not only save processor resource,
Cost can also be reduced.
In view of this, the application provides a kind of key press detecting circuit being integrated with ambient brightness detection, examined with abundant button
The function of slowdown monitoring circuit saves processor resource.
The technical solution of the application is described in detail with specific embodiment below, below these specific implement
Example can be combined with each other, and same or analogous concept or process may be repeated no more in some embodiments.
Fig. 1 is the electrical block diagram for the key press detecting circuit embodiment one that the application is integrated with ambient brightness detection.
Please refer to Fig. 1, the key press detecting circuit provided in this embodiment for being integrated with ambient brightness detection, including pull-up resistor 1, button mould
Block 2, luminance detection circuit 3 and processor 4, wherein the first end 11 of pull-up resistor 1 is connect with constant pressure source VCC, pull-up resistor 1
Second end 12 connected with key-press module 2 by the voltage detecting end 21 of key-press module 2 after be grounded, the of luminance detection circuit 3
One end 31 is connect with voltage detecting end 21, and the second end 32 of luminance detection circuit 3 is grounded, and voltage detecting end 21 connects with processor 4
It connects, processor 4, for determining the button for being currently at pressing state or determining key press detecting circuit according to collected voltage value
The current brightness value of local environment.
Specifically, pull-up resistor 1 is the resistance R1 in circuit diagram shown in Fig. 1.In addition, key-press module 2 include N number of button and
N-1 resistance, the first end ground connection of each button, the second end of each two button are connected by a resistance, wherein first
The node that button is connect with first resistance be voltage detecting end 21, the node that n-th button is connect with the N-1 resistance with it is bright
The first end 31 for spending detection circuit 3 connects.
For example, in the embodiment shown in fig. 1, key-press module 2 includes 8 buttons and 7 resistance, 8 buttons are respectively to press
Key S1 to button S8,7 resistance are respectively resistance R2 to resistance R8.It should be noted that the first end of button is electricity shown in Fig. 1
The left end of road figure, the second end of button is the right end of circuit diagram shown in Fig. 1, as shown in Figure 1, first ends of the button S1 to button S8
It is grounded, the second end of each two button is connected by a resistance, i.e. the second end of button S1 and the second end of button S2 is logical
Cross resistance R2 connections, the second end of button S2 is connect with the second end of button S3 by resistance R3, the second end of button S3 with press
The second end of key S4 is connected by resistance R4, and the second end of button S4 is connect with the second end of button S5 by resistance R5, button
The second end of S5 is connect with the second end of button S6 by resistance R6, and the second end of button S6 passes through electricity with the second end of button S7
R7 connections are hindered, the second end of button S7 is connect with the second end of button S7 by resistance R8.Wherein, button S1 is connected with resistance R2
Node be key-press module 2 voltage detecting end 21.In addition, as shown in Figure 1, the first end 31 and button of luminance detection circuit 3
The node connection that S8 is connect with resistance R8.
Optionally, in one possible realization method of the application, luminance detection circuit 3 includes a photo resistance RL1.
The work that following is a brief introduction of the key press detecting circuit provided by the present application for being integrated with ambient brightness detection is former
Reason.
Specifically, please refer to Fig. 1, when a button is pressed, at this point, electric current after pull-up resistor 1, is flowed through and is pressed
Then button flows into ground after button S2.For example, after button S2 is pressed, electric current flows through resistance R2 after pull-up resistor 1,
Then ground is flowed into after button S2, at this point, the voltage value at 4 collected voltage detecting end 21 of processor is VCC*R2/ (R1+
R2).In this way, processor 4 can determine whether that button 2 is in pressing state (for example, processor 4 can root according to collected voltage value
Determine which current button is pressed according to the correspondence of collected voltage value and voltage value and button).Further,
When not having that a button is pressed, at this point, electric current after pull-up resistor 1, flows successively through resistance R2 to resistance R8, most afterwards through photosensitive electricity
Ground is flowed into after hindering RL1, at this point, the voltage value at 4 collected voltage detecting end 21 of processor is A, wherein
A=VCC* (R2+R3+R4+R5+R6+R7+R8+RL1)/(R1+R2+R3+R4+R5+R6+R7+R8+RL1)
It should be noted that the resistance value of photo resistance RL1 becomes with the variation for the light luminance for being radiated at its surface
Change, in this way, processor 4 can calculate the current brightness value of environment according to collected voltage value.For example, in an embodiment
In, processor 4 can calculate the current resistance values of photo resistance RL1 according to collected voltage value, and then according to photo resistance
The resistance value of RL1 and the correspondence of brightness value calculate the current brightness value of environment.
The key press detecting circuit provided in this embodiment for being integrated with ambient brightness detection is integrated with ambient brightness detection work(
Can, key press detecting circuit and luminance detection circuit share an ADC interface, processor resource can be saved, in addition, compared to existing
Key press detecting circuit and light sensation circuit are independently arranged in technology, additionally it is possible to save installation space, reduce cost.
Fig. 2 is the electrical block diagram for the key press detecting circuit embodiment two that the application is integrated with ambient brightness detection.
Fig. 2 is please referred to, on the basis of the above embodiments, key press detecting circuit provided in this embodiment, luminance detection circuit 3 further includes
One divider resistance R9, wherein the first end of divider resistance R9 is connected with the node that n-th button is connect with the N-1 resistance, point
The second end of piezoresistance R9 is connect with the first end of photo resistance RL1, the second end ground connection of photo resistance RL1.
Specifically, referring to Fig. 1, the first end of divider resistance R9 and photo resistance RL1 refer both to the upper of circuit diagram shown in Fig. 1
End.
It should be noted that the resistance value of photo resistance RL1 is dropped with the enhancing for the light intensity for being radiated at its surface
It is low, when the resistance value of photo resistance RL1 is reduced to sufficiently small, when to avoid not by key pressing, 4 collected electricity of processor
Pressure value is too close to processor collected voltage value when pushing button S8, provided by the present application to be integrated with so as to cause erroneous judgement
The key press detecting circuit of ambient brightness detection, is arranged a divider resistance R9, in this way, can be further in luminance detection circuit 3
Improve the accuracy of detection.
Further, please continue to refer to Fig. 2, the button detection electricity provided in this embodiment for being integrated with ambient brightness detection
Road, further includes filter circuit 5, and filter circuit 5 is arranged between voltage detecting end 21 and processor 4.
Specifically, filter circuit 5 can be with filtering interference signals, which may be used appointing with filter function
The circuit structure of what form, is not defined the concrete structure of filter circuit herein.
Optionally, in one possible realization method of the application, filter circuit 5 includes a filter resistance RT1 and a capacitance
The first end of C1, filter resistance RT1 are connect with voltage detecting end 21, the second end of filter resistance RT1 respectively with capacitance C1
One end and processor 4 connect, the second end ground connection of capacitance C1.
Specifically, the first end of filter resistance RT1 refers to the left end of circuit diagram shown in Fig. 2, the first end of capacitance C1 refers to Fig. 2 institutes
Show the upper end of circuit diagram.
It should be noted that in another possible realization method of the application, filter circuit 5 may include an inductance, should
One end of inductance is connect with voltage detecting end 21, and the other end is connect with processor 4.
The key press detecting circuit provided in this embodiment for being integrated with ambient brightness detection, by voltage detecting end and processing
Filter circuit is set between device, in this way, can filtering interference signals, avoid because interference signal there are due to cause erroneous judgement.Therefore,
The key press detecting circuit provided in this embodiment for being integrated with ambient brightness detection, strong interference immunity.
Further, please continue to refer to Fig. 2, the button detection electricity provided in this embodiment for being integrated with ambient brightness detection
Road further includes regulator circuit 6, and regulator circuit setting 6 is between filter circuit 5 and processor 4.
Specifically, regulator circuit 6 can be by the voltage value stabilization at voltage detecting end in particular value, to avoid due to overtension
Cause entire circuit burnout.
The present embodiment is not defined the concrete structure of regulator circuit 6.Optionally, in a kind of possible realization of the present invention
In mode, regulator circuit 6 includes a Transient Suppression Diode TVS1.
The key press detecting circuit provided in this embodiment for being integrated with ambient brightness detection can be kept away by the way that regulator circuit is arranged
Exempt from that entire circuit is caused to damage because of overtension, can further improve the safety of circuit.
A specific example is given below, to be described in detail it is provided by the present application be integrated with ambient brightness detection by
The application scenarios of key detection circuit.
Fig. 3 is the application scenarios schematic diagram of the key press detecting circuit provided by the present application for being integrated with ambient brightness detection.Please
With reference to Fig. 3, the key press detecting circuit provided by the present application for being integrated with ambient brightness detection can be applied to carry out backlight tune
In the electronic equipment of section, in this way, processor 4 can calculate the current brightness value of environment according to collected voltage value, and according to
Calculated brightness value control is exported to the duty ratio of the pwm signal of backlight circuit, to adjust the electric current of backlight circuit output, from
And it controls the backlight brightness.For example, when calculated brightness value is higher, illustrate that ambient brightness is higher, at this point, reducing output to the back of the body
The duty ratio of the pwm signal of optical circuit to reduce the electric current of backlight circuit output, and then reduces backlight illumination.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (9)
1. a kind of key press detecting circuit being integrated with ambient brightness detection, which is characterized in that the key press detecting circuit includes upper
Pull-up resistor, key-press module, luminance detection circuit and processor, wherein the first end of the pull-up resistor is connect with constant pressure source, institute
State pull-up resistor second end connected with the key-press module by the voltage detecting end of the key-press module after be grounded, it is described bright
The first end of degree detection circuit is connect with the voltage detecting end, the second end ground connection of the luminance detection circuit, the voltage
Test side is connected to the processor, the processor, for being currently at pressing state according to the determination of collected voltage value
Button or determine the current brightness value of the key press detecting circuit local environment.
2. key press detecting circuit according to claim 1, which is characterized in that the key-press module includes N number of button and N-1
A resistance, the first end ground connection of each button, the second end of each two button are connected by a resistance, wherein first is pressed
The node that key is connect with first resistance is the voltage detecting end, the node and institute that n-th button is connect with the N-1 resistance
State the first end connection of luminance detection circuit.
3. key press detecting circuit according to claim 2, which is characterized in that the luminance detection circuit includes a photosensitive electricity
Resistance.
4. key press detecting circuit according to claim 3, which is characterized in that the luminance detection circuit further includes a partial pressure
Resistance, the first end of the divider resistance are connected with the node that the n-th button is connect with the N-1 resistance, the partial pressure
The second end of resistance is connect with the first end of the photo resistance, the second end ground connection of the photo resistance.
5. key press detecting circuit according to claim 1, which is characterized in that the key press detecting circuit further includes filtered electrical
Road, the filter circuit are arranged between the voltage detecting end and the processor.
6. key press detecting circuit according to claim 5, which is characterized in that the filter circuit include a filter resistance and
One capacitance, the first end of the filter resistance are connect with the voltage detecting end, the second end of the filter resistance respectively with institute
State first end and the processor connection of capacitance, the second end ground connection of the capacitance.
7. key press detecting circuit according to claim 5, which is characterized in that the key press detecting circuit further includes voltage stabilizing electricity
Road, the regulator circuit are arranged between the filter circuit and the processor.
8. key press detecting circuit according to claim 7, which is characterized in that the regulator circuit includes that a transient state inhibits two
Pole pipe.
9. key press detecting circuit according to claim 2, which is characterized in that the N is 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820193149.XU CN207782765U (en) | 2018-02-02 | 2018-02-02 | A kind of key press detecting circuit being integrated with ambient brightness detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820193149.XU CN207782765U (en) | 2018-02-02 | 2018-02-02 | A kind of key press detecting circuit being integrated with ambient brightness detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207782765U true CN207782765U (en) | 2018-08-28 |
Family
ID=63212268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820193149.XU Active CN207782765U (en) | 2018-02-02 | 2018-02-02 | A kind of key press detecting circuit being integrated with ambient brightness detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207782765U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365178A (en) * | 2021-04-28 | 2021-09-07 | 广东朝阳电子科技股份有限公司 | Method for realizing input port expansion by sharing temperature detection port of Bluetooth headset |
| CN114475881A (en) * | 2022-02-14 | 2022-05-13 | 海固科技(苏州)有限公司 | Bicycle dial plate device and bicycle |
-
2018
- 2018-02-02 CN CN201820193149.XU patent/CN207782765U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365178A (en) * | 2021-04-28 | 2021-09-07 | 广东朝阳电子科技股份有限公司 | Method for realizing input port expansion by sharing temperature detection port of Bluetooth headset |
| CN113365178B (en) * | 2021-04-28 | 2022-09-30 | 广东朝阳电子科技股份有限公司 | Method for realizing input port expansion by sharing temperature detection port of Bluetooth headset |
| CN114475881A (en) * | 2022-02-14 | 2022-05-13 | 海固科技(苏州)有限公司 | Bicycle dial plate device and bicycle |
| CN114475881B (en) * | 2022-02-14 | 2024-04-05 | 海固科技(苏州)有限公司 | Bicycle dial plate device and bicycle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104702254B (en) | Semiconductor substrate anomalies detection circuit | |
| CN106710531B (en) | Backlight control circuit and electronic device | |
| CN207782765U (en) | A kind of key press detecting circuit being integrated with ambient brightness detection | |
| CN104345867B (en) | Field device | |
| CN101119162A (en) | Semiconductor integrated circuit outputting detection signal based on detection result of a detecting device and electronic device including the same | |
| CN106218548A (en) | Car lamp control system based on CAN LIN network | |
| CN106019040A (en) | Optical-coupler electrical performance detection device | |
| CN102963295B (en) | A kind of backlight circuit of automobile combination meter and backlight Automatic adjustment method thereof | |
| CN205643661U (en) | Undervoltage power detection device and have its air conditioner | |
| US8228646B2 (en) | Apparatus and method for draining stored power | |
| CN105916267A (en) | Flashlight illumination brightness adjusting method, flashlight illumination brightness adjusting device and mobile terminal | |
| CN104950239A (en) | Backlight driving detection circuit | |
| CN108391343B (en) | LED detection device, detection system and detection method | |
| ATE368864T1 (en) | ELECTRICAL CIRCUIT FOR DRIVING A LOAD | |
| CN215641545U (en) | Hydrogen fuel car pencil loading detecting system and circuit | |
| CN211603503U (en) | IC module open circuit or short circuit detection device | |
| CN108369252A (en) | Electronic equipment | |
| KR20130083322A (en) | Apparatus for supplying power | |
| TWM534700U (en) | Vehicle electrical apparatus with protection and detection mechanism for power reversely | |
| CN219107721U (en) | Dimming control circuit | |
| CN110351541A (en) | Voltage setting value adjusts device and its circuit | |
| CN208939346U (en) | Power cabinet | |
| CN202614916U (en) | Electronic load machine | |
| CN209488438U (en) | Automatic detection compensation control circuit and detection compensation system | |
| CN216390965U (en) | Multiplexing circuit and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |