CN109639263A - A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal - Google Patents
A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal Download PDFInfo
- Publication number
- CN109639263A CN109639263A CN201910100925.6A CN201910100925A CN109639263A CN 109639263 A CN109639263 A CN 109639263A CN 201910100925 A CN201910100925 A CN 201910100925A CN 109639263 A CN109639263 A CN 109639263A
- Authority
- CN
- China
- Prior art keywords
- input
- nand gate
- key
- circuit
- matrix keyboard
- 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.)
- Pending
Links
- 239000011159 matrix material Substances 0.000 title claims abstract description 16
- 230000008030 elimination Effects 0.000 title claims abstract description 10
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 3
- 206010044565 Tremor Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/965—Switches controlled by moving an element forming part of the switch
- H03K17/967—Switches controlled by moving an element forming part of the switch having a plurality of control members, e.g. keyboard
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/125—Discriminating pulses
- H03K5/1252—Suppression or limitation of noise or interference
- H03K5/1254—Suppression or limitation of noise or interference specially adapted for pulses generated by closure of switches, i.e. anti-bouncing devices
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21157—Broken, open line, cable, circuit, faulty connection
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Nonlinear Science (AREA)
- Input From Keyboards Or The Like (AREA)
Abstract
The present invention provides a kind of matrix keyboard circuit for eliminating key jitter and interrupt signal output with hardware, which is made of disappear twitter circuit, four input nand gates and Schmidt's NAND gate of matrix keyboard, the RC of 4x5.When key is not pressed, H1 to the H4 of key keeps weak pull-up state, and L1 to L5 keeps strong pull-down state, when pressing key pressing, weak pull-up is pulled low, the reversion of NAND gate output level, the charging of RC circuit is given, band is formed after Schmidt's NAND gate and disappears the interrupt signal trembled.Circuit changes classical matrix keyboard using the method for largely consuming single-chip microcontroller or other microcontroller resources in software timing scanning and software for jitters elimination.Single-chip microcontroller or other microcontroller resources have largely been saved, the consumption of electric energy is thereby reduced.
Description
Technical field
The present invention relates to a kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal belongs to application electric technology neck
Domain.
Background technique
Matrix keyboard circuit is very widely used in daily life, with the improvement of living standards, various intelligence
Energy product appears in our life.For intellectual product, the quantity of key sometimes requires that comparison is more.But in order to save
Cost, is generally used that port is less, the less single-chip microcontroller of resource or other microcontrollers.For meet key demand it is more,
The less single-chip microcontroller of resource or other microcontroller controlling function products devise a kind of band hardware for jitters elimination and interrupt signal
Matrix keyboard circuit solve the problems, such as that key is more, resource is few.
Summary of the invention
The object of the present invention is to provide a kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal, for key compared with
In the circuit of more, the less single-chip microcontroller of resource or other microcontrollers.
Specific technical solution adopted by the present invention is as follows:
A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal, it is characterized in that: the circuit include 4x5 matrix keyboard,
Resistance R1, capacitor C1, four input nand gate U1, two input Schmidt's NAND gate U2, connecting terminal H1 to H4, connecting terminal L1 are arrived
L5, connecting terminal INT.Wherein the left end of 4x5 key is connected to capable connecting terminal H, and the right end of key is connected to respective column
Connecting terminal L；Input terminal H1 to the H4 of Input terminal block is connected to the input terminal of four input nand gate U1；Resistance R1 and C1 goes here and there
Join stroke RC filter circuit, R1 input four input nand gate output end U1 of termination, the other end is connected with C1, the one end C1 ground connection, separately
Outer one end is connected with R1；Two input terminals of input nand gate two are connected with the concatenated node of RC, and output point connects output terminal
INT。
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the matrix keyboard circuit with hardware for jitters elimination and interrupt signal of this patent.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
Application method of the invention are as follows: under normal circumstances, H1 to H4 is made using single-chip microcontroller or other microcontrollers
Port is in weak pull-up state；L1 to L5 is connected to single-chip microcontroller or the I/O port of other microcontrollers, makes to keep under by force
Tension state.In no key-press input, single-chip microcontroller or other microcontrollers may be at that standby or other are not related to
And the work of key.When occurring by key pressing, since the impedance of key is very low, the weak pull-up of the wherein single line of H1 to H4 is straight
It is connected in the wherein single line of L1 to L5 in succession.The wherein single line level of H1 to H4 is pulled low.After input variation, due to four defeated
The input terminal for entering NAND gate is not all of high level, and the level of output end becomes high level by original low level；NAND gate is defeated
Outlet is by R1 resistance to capacitor charging.When shaking input, since shaky time is short, capacitor charging can not be made all electric enough
Pressure.When being only more than RC time constant by the key pressing time, the reversion of Schmidt's NAND gate U2 output level has reached the mesh for disappearing and trembling
's.The interruptive port that U2 output end is connected to single-chip microcontroller perhaps other microcontrollers can wake up single-chip microcontroller or other are micro-
Type controller allows program to enter and interrupts keystroke handling program.Finally reach eliminate key jitter and save single-chip microcontroller or other
The purpose of microcontroller resource.
This using new-type circuit it is characterized in that: the circuit include the matrix keyboard of 4x5, electronics R1, capacitor C1,4 input with
NOT gate U1, two input Schmidt's NAND gate U2, connecting terminal H1 to H4, connecting terminal L1 to L5, connecting terminal INT.Wherein 4x5
The left end of key is connected to capable connecting terminal H, and the right end of key is connected to the connecting terminal L of respective column；Input terminal block
Input terminal H1 to H4 be connected to the input terminal of four input nand gate U1；Resistance R1 connects stroke RC filter circuit with C1, and R1 is defeated
Enter four input nand gate output end U1 of termination, the other end is connected with C1, and the one end C1 ground connection, other end is connected with R1；Two inputs
Two input terminals of NAND gate are connected with the concatenated node of RC, and output point connects output terminal INT.
Claims (2)
1. a kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal, it is characterized in that: the circuit includes the matrix key of 4x5
Disk, resistance R1, capacitor C1, four input nand gate U1, two input Schmidt's NAND gate U2, connecting terminal H1 to H4, connecting terminal
L1 to L5, connecting terminal INT, wherein the left end of 4x5 key is connected to capable connecting terminal H, and the right end of key is connected to pair
The connecting terminal L that should be arranged；Input terminal H1 to the H4 of Input terminal block is connected to the input terminal of four input nand gate U1；Resistance R1 with
C1 series connection stroke RC filter circuit, R1 input four input nand gate output end U1 of termination, the other end are connected with C1, and C1 mono- is terminated
Ground, other end are connected with R1；Two input terminals of input nand gate two are connected with the concatenated node of RC, and output point connects output end
Sub- INT.
2. a kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal according to claim 1, it is characterized in that: circuit
Parameter U1 uses 4 input nand gates, and U2 exports NAND gate using Schmidt's type two, and R1 resistance uses 10k valued resistor, and C1 is adopted
With 10uF non-polar capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910100925.6A CN109639263A (en) | 2019-02-01 | 2019-02-01 | A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910100925.6A CN109639263A (en) | 2019-02-01 | 2019-02-01 | A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109639263A true CN109639263A (en) | 2019-04-16 |
Family
ID=66064578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910100925.6A Pending CN109639263A (en) | 2019-02-01 | 2019-02-01 | A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109639263A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117971052A (en) * | 2024-03-28 | 2024-05-03 | 深圳市达沃电子有限公司 | Control circuit and method for mining keyboard and mouse |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789793A (en) * | 2010-01-15 | 2010-07-28 | 电子科技大学中山学院 | Determinant linear array coordinate scanning circuit |
| CN201774635U (en) * | 2010-01-26 | 2011-03-23 | 深圳市同洲电子股份有限公司 | Circuit for eliminating jitter of key switch and device thereof |
| CN106067789A (en) * | 2016-06-15 | 2016-11-02 | 湖南工业大学 | Preventing jittering circuit |
| CN106100614A (en) * | 2016-06-15 | 2016-11-09 | 湖南工业大学 | Button disappears twitter circuit |
| CN106130516A (en) * | 2016-06-15 | 2016-11-16 | 湖南工业大学 | Mechanical switch disappears twitter circuit |
| CN106504416A (en) * | 2017-01-04 | 2017-03-15 | 广西安辰信息产业股份有限公司 | The anti-pry Orderless keyboards of ATM and method |
| CN108227940A (en) * | 2017-12-12 | 2018-06-29 | 天津津航计算技术研究所 | A kind of ultralow radiation keyboard |
| CN209170335U (en) * | 2019-02-01 | 2019-07-26 | 南宁学院 | A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal |
-
2019
- 2019-02-01 CN CN201910100925.6A patent/CN109639263A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789793A (en) * | 2010-01-15 | 2010-07-28 | 电子科技大学中山学院 | Determinant linear array coordinate scanning circuit |
| CN201774635U (en) * | 2010-01-26 | 2011-03-23 | 深圳市同洲电子股份有限公司 | Circuit for eliminating jitter of key switch and device thereof |
| CN106067789A (en) * | 2016-06-15 | 2016-11-02 | 湖南工业大学 | Preventing jittering circuit |
| CN106100614A (en) * | 2016-06-15 | 2016-11-09 | 湖南工业大学 | Button disappears twitter circuit |
| CN106130516A (en) * | 2016-06-15 | 2016-11-16 | 湖南工业大学 | Mechanical switch disappears twitter circuit |
| CN106504416A (en) * | 2017-01-04 | 2017-03-15 | 广西安辰信息产业股份有限公司 | The anti-pry Orderless keyboards of ATM and method |
| CN108227940A (en) * | 2017-12-12 | 2018-06-29 | 天津津航计算技术研究所 | A kind of ultralow radiation keyboard |
| CN209170335U (en) * | 2019-02-01 | 2019-07-26 | 南宁学院 | A kind of matrix keyboard circuit with hardware for jitters elimination and interrupt signal |
Non-Patent Citations (2)
| Title |
|---|
| 杨伟: "单片机按键消抖技术及其扩展应用", 《电子测试》, pages 96 - 97 * |
| 聂丽文: "一种单片机键盘的实现方法", 《深圳职业技术学院学报》, no. 1, pages 1 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117971052A (en) * | 2024-03-28 | 2024-05-03 | 深圳市达沃电子有限公司 | Control circuit and method for mining keyboard and mouse |
| CN117971052B (en) * | 2024-03-28 | 2024-06-07 | 深圳市达沃电子有限公司 | Control circuit and method for mining keyboard and mouse |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190416 |
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| WD01 | Invention patent application deemed withdrawn after publication |