CN104124952A - Recognizable keying circuit - Google Patents
Recognizable keying circuit Download PDFInfo
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- CN104124952A CN104124952A CN201410350915.5A CN201410350915A CN104124952A CN 104124952 A CN104124952 A CN 104124952A CN 201410350915 A CN201410350915 A CN 201410350915A CN 104124952 A CN104124952 A CN 104124952A
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Abstract
The invention relates to the technical field of single chip microcomputer control, in particular to a recognizable keying circuit. The recognizable keying circuit is characterized in that an electric circuit formed by connecting capacitors C1 and resistors R1 in parallel is connected among earth points of press keys K1, and then the press keys K1 which control a master device are grounded through the electric circuit formed by connecting the capacitors C1 and the resistors R1 in parallel, and the press keys K1, the capacitors C1 and the resistors R1 form recognizable press keys. After the press keys K1 are pressed down, rising waveforms are generated, characteristics of the waveforms are different due to influences of values of the resistors R1 and the capacitors C1, and a control chip U1 judges whether the press keys K1 which control specific functions of the master device are pressed down by comparing the waveforms. Parameters of the capacitors and the resistors, which are connected with the press keys in series, are different due to the different press keys of the master device, and therefore the waveform generated by each press key is unique and can be used as a press key fingerprint, and the purpose of controlling each specific function of the master device only through each corresponding press key K1 by comparing the waveforms generated when the press keys K1 are closed under pressure is achieved.
Description
Technical field
The present invention relates to single-chip microcomputer control technology field, relating in particular to one can key range circuit.
Background technology
Some specific occasions need button and main equipment relatively independent, require main equipment could operate specific function by a or a button, other similar button operation is without response, and button requires simply not transreplication, without power supply.Existing button is all identified by voltage, is easy to copy, and just need to add chip as reached above-mentioned functions, is difficult for realization and cost high.
Summary of the invention
The object of the invention is to propose one can key range circuit, by giving resistance and the electric capacity of the different sizes of button series connection of controlling main equipment, the waveform that each button is produced is unique, form button fingerprint separately, thereby the waveform producing during by the pressing of comparison button reaches and only has by this by the object of key control main equipment specific function.
For reaching this object, the present invention by the following technical solutions:
One can key range circuit, comprise: control chip U1, capacitor C 1 and the resistance R 1 of resistance R 69, button K1, main equipment, one end of described resistance R 69 connects the power port of control chip U1, the other end of described R69 connects one end of button K1, the other end of described button K1 connects one end of capacitor C 1, one end of resistance R 1, the other end of described capacitor C 1, the equal ground connection of the other end of resistance R 1, one end of described button K1 also connects the detection port of control chip U1.
Wherein, the resistance of described resistance R 69 is 1K Ω, and the capacitance of described capacitor C 1 is 100nF, and the resistance of described resistance R 1 is 200 Ω.
Wherein, after described button K1 is by pressing, close button K1 power supply by control chip U1, after the scheduled time of interval, open again button K1 power supply, the stable waveform producing to obtain button K1.
Beneficial effect:
The present invention, by the circuit of electric capacity C1 and resistance R 1 parallel connection on string between the earth point of button K1, makes the button K1 that controls main equipment by the circuit ground of capacitor C 1 and resistance R 1 parallel connection, and button K1, capacitor C 1, resistance R 1 have formed can key range.After button K1 presses, can produce rising waveform, this wave character is subject to impact that resistance R 1 is worth from capacitor C 1 and different, and control chip U1 judges whether it is the button K1 of this main equipment specific function of control by comparison waveform.Because of the electric capacity of the different key series connection of main equipment different with resistance parameter, so the waveform that each button produces is unique, can be used as button fingerprint, thereby the waveform producing during by comparison button K1 pressing reaches and only has the object of controlling main equipment specific function by this button K1.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram that can key range circuit that the specific embodiment of the invention provides.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
Fig. 1 is a kind of circuit diagram that can key range circuit that the specific embodiment of the invention provides.As shown in Figure 1, one of the present invention can key range circuit, comprise: comprising: control chip U1, capacitor C 1 and the resistance R 1 of resistance R 69, button K1, main equipment, one end of described resistance R 69 connects the power port of control chip U1, the other end of described R69 connects one end of button K1, the other end of described button K1 connects one end of capacitor C 1, one end of resistance R 1, the other end of described capacitor C 1, the equal ground connection of the other end of resistance R 1, one end of described button K1 also connects the detection port of control chip U1.
The present invention, by the circuit of electric capacity C1 and resistance R 1 parallel connection on string between the earth point of button K1, makes the button K1 that controls main equipment by the circuit ground of capacitor C 1 and resistance R 1 parallel connection, and button K1, capacitor C 1, resistance R 1 have formed can key range.After button K1 presses, can produce rising waveform, this wave character is subject to impact that resistance R 1 is worth from capacitor C 1 and different, and control chip U1 judges whether it is the button K1 of this main equipment specific function of control by comparison waveform.Because of the electric capacity of the different key series connection of main equipment different with resistance parameter, so the waveform that each button produces is unique, can be used as button fingerprint, thereby the waveform producing during by comparison button K1 pressing reaches and only has the object of controlling main equipment specific function by this button K1.
Preferably, the resistance of described resistance R 69 is 1K Ω, and the capacitance of described capacitor C 1 is 100nF, and the resistance of described resistance R 1 is 200 Ω.It should be noted that, control chip U1 of the present invention is existing known control chip, preferably, is the control chip of MTK6589 series.
After described button K1 is by pressing, close button K1 power supply by control chip U1, after the scheduled time of interval, open again button K1 power supply, the stable waveform producing to obtain button K1.
As preferably execution mode of one, as the MIC that described main equipment is handset earphone, described button K1 is the button of controlling MIC locking.By the circuit of electric capacity C1 and resistance R 1 parallel connection on string between the earth point at button K1, the MIC that makes handset earphone and button K1 are by capacitor C 1 and resistance R 1 circuit ground in parallel, button K1, capacitor C 1, resistance R 1 have just formed can key range, now button K1 can produce rising waveform after pressing, the waveform signal comparison waveform that control chip U1 can detect according to detection port, judges whether it is the button of controlling MIC locking.While beginning because of button K1 pressing, have shake, can be after judging that button K1 is by pressing, close button K1 power supply by control chip U1, after the certain hour of interval, open again button K1 power supply, the rising waveform now producing is stable, can be used as button fingerprint, and the waveform that now main equipment gathers is the most stable, comparison error is also minimum, and precision also can be higher.
It should be noted that, the components and parts of above circuit and parameter thereof, be only the technical program preferred embodiment, the technical program can also be selected other components and parts and parameter thereof; According to public's general knowledge, those skilled in the art, for the different application scenarios of the technical program, do not need to bring into play creativity, just can adjust components and parts and parameter thereof.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in; be equal to replacement or changed according to technical scheme of the present invention and inventive concept thereof, within all should being encompassed in protection scope of the present invention.
Claims (3)
- One kind can key range circuit, it is characterized in that, comprise: control chip U1, capacitor C 1 and the resistance R 1 of resistance R 69, button K1, main equipment, one end of described resistance R 69 connects the power port of control chip U1, the other end of described R69 connects one end of button K1, the other end of described button K1 connects one end of capacitor C 1, one end of resistance R 1, the other end of described capacitor C 1, the equal ground connection of the other end of resistance R 1, and one end of described button K1 also connects the detection port of control chip U1.
- 2. one according to claim 1 can key range circuit, it is characterized in that, the resistance of described resistance R 69 is 1K Ω, and the capacitance of described capacitor C 1 is 100nF, and the resistance of described resistance R 1 is 200 Ω.
- 3. one according to claim 1 can key range circuit, it is characterized in that, after described button K1 is by pressing, close button K1 power supply by control chip U1, after the scheduled time of interval, open again button K1 power supply, the stable waveform producing to obtain button K1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410350915.5A CN104124952B (en) | 2014-07-22 | 2014-07-22 | A kind of recognizable key circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410350915.5A CN104124952B (en) | 2014-07-22 | 2014-07-22 | A kind of recognizable key circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104124952A true CN104124952A (en) | 2014-10-29 |
| CN104124952B CN104124952B (en) | 2018-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410350915.5A Active CN104124952B (en) | 2014-07-22 | 2014-07-22 | A kind of recognizable key circuit |
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| Country | Link |
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| CN (1) | CN104124952B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422863A (en) * | 2016-05-23 | 2017-12-01 | 新唐科技股份有限公司 | Secure keyboard devices and its keyboard recognition methods |
| CN109038709A (en) * | 2018-07-12 | 2018-12-18 | 深圳拓邦股份有限公司 | A kind of identification circuit of key, method and blender |
| CN109523765A (en) * | 2017-09-20 | 2019-03-26 | 富泰华工业（深圳）有限公司 | Remote controler |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090284301A1 (en) * | 2008-05-15 | 2009-11-19 | Zhi Jun Liao | Key press detecting circuit |
| CN201788385U (en) * | 2010-09-17 | 2011-04-06 | 美的集团有限公司 | Key control circuit of microwave oven |
| CN203180871U (en) * | 2013-03-27 | 2013-09-04 | 潍坊歌尔电子有限公司 | Bluetooth earphone reset circuit |
| CN203217471U (en) * | 2013-03-14 | 2013-09-25 | 厦门歌乐电子企业有限公司 | Electronic device and vehicle |
-
2014
- 2014-07-22 CN CN201410350915.5A patent/CN104124952B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090284301A1 (en) * | 2008-05-15 | 2009-11-19 | Zhi Jun Liao | Key press detecting circuit |
| CN201788385U (en) * | 2010-09-17 | 2011-04-06 | 美的集团有限公司 | Key control circuit of microwave oven |
| CN203217471U (en) * | 2013-03-14 | 2013-09-25 | 厦门歌乐电子企业有限公司 | Electronic device and vehicle |
| CN203180871U (en) * | 2013-03-27 | 2013-09-04 | 潍坊歌尔电子有限公司 | Bluetooth earphone reset circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422863A (en) * | 2016-05-23 | 2017-12-01 | 新唐科技股份有限公司 | Secure keyboard devices and its keyboard recognition methods |
| CN107422863B (en) * | 2016-05-23 | 2020-06-12 | 新唐科技股份有限公司 | Safety keyboard device and keyboard key identification method thereof |
| CN109523765A (en) * | 2017-09-20 | 2019-03-26 | 富泰华工业（深圳）有限公司 | Remote controler |
| CN109038709A (en) * | 2018-07-12 | 2018-12-18 | 深圳拓邦股份有限公司 | A kind of identification circuit of key, method and blender |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104124952B (en) | 2018-03-27 |
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