CN206505161U - A kind of new and effective key-press status detection circuit - Google Patents
A kind of new and effective key-press status detection circuit Download PDFInfo
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- CN206505161U CN206505161U CN201720145036.8U CN201720145036U CN206505161U CN 206505161 U CN206505161 U CN 206505161U CN 201720145036 U CN201720145036 U CN 201720145036U CN 206505161 U CN206505161 U CN 206505161U
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Abstract
The utility model discloses a kind of new and effective key-press status detection circuit, for detecting that whether normal key-press status is, including the key press detecting circuit module being sequentially connected, comparison circuit module, microprocessor unit module and button display module, another output end of the input of the microprocessor module also with the key press detecting circuit module is connected, and button display module includes LED display unit and passive buzzer unit；Whole key-press status detection process is that button disconnection button pushes button release button disconnection, in detection process, buzzer switchs to not ring by growing sound, and light emitting diode bright switchs to not work by growing, mean that key-press status is normal, otherwise mean that key-press status is abnormal；Whole detection process can detect that whether normal key-press status is to high efficient and reliable, solve the problem of traditional AD sample detectings method is high to button coherence request, realize the versatility of key-press status detection, substantially reduce the maintenance cost in product later stage.
Description
Technical field
The utility model is related to key-press status detection field, more particularly to a kind of new and effective key-press status detection circuit.
Background technology
At present, button is almost used in all electrical equipment, and the quality of key-press status is directly connected to what user used
Direct feel.Existing key-press status detection technique is generally AD sample detecting key-press status, using AD values come key range state,
There is very high requirement to the uniformity of button, and different button manufacturer is inconsistent due to the material used, causes button
Uniformity differ greatly, same detection circuit is not applied for the button of different manufacturers；Even and if state is good when dispatching from the factory
Good button it is possible that key contacts are bad, influence the use of client, causes after-sales service after long-time use
Expense is raised.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of new and effective key-press status detection electricity
Road, can be applied to the button of detection different manufacturers production, and greatly reduce after-sales service expense.
The utility model solve technical scheme that its technical problem used for：
A kind of new and effective key-press status detection circuit, for detecting that whether normal key-press status is, including be sequentially connected
For detecting the key press detecting circuit module of key-press status, the comparison circuit mould for controlling microprocessor unit module resets
Block, for the microprocessor unit module that is handled the key state information received and for whether showing current button
The button display module effectively pressed, the input of the microprocessor module is also another with the key press detecting circuit module
Output end is connected.
The key press detecting circuit module includes button SW1,3rd resistor R3, the 4th resistance R4 and the first electric capacity C1, institute
State button SW1 one end connection power supply VCC, the button SW1 other end connection 3rd resistor R3 one end, the 3rd electricity
The other end for hindering R3 connects the MCU_TEST input pins of microprocessor module, the 4th resistance R4 one end and the button SW1 and
The common port d of the 3rd resistor R3 is connected, the other end ground connection of the 4th resistance R4, the first electric capacity C1 and the described 4th electricity
Hinder R4 in parallel, the button SW1,3rd resistor R3, the 4th resistance R4, the first electric capacity C1 common port d output voltages with it is described
The input JV connections of comparison circuit module.
The button display module includes LED display unit, passive buzzer unit, N-type triode Q1, first resistor R1
With second resistance R2；The base stage of the N-type triode Q1 and the output end MCU_B/L connections of microprocessor module, described second
Resistance R2 one end is connected with N-type triode Q1 colelctor electrode, the other end of the second resistance R2 and the one of first resistor R1
End connection, the second resistance R2 and first resistor R1 is connected in series to, the other end and the electricity of the first resistor R1
Source VCC connections；The passive buzzer unit is connected in parallel with first resistor R1；The LED display unit is just
Emitter stage extremely with N-type triode Q1 is connected, the negative pole end ground connection of the LED display unit.
The output end of the comparison circuit module is connected with the resetting pin of the microprocessor module, when the comparison circuit
When the input voltage of module input is more than the reference voltage of the comparison circuit module, the comparison circuit module exports low electricity
It is flat, it is single-chip microcomputer input reset signal, is resetted.
The beneficial effects of the utility model have：The utility model LED display unit and passive buzzer unit are using same
Triode is driven, and solving existing LED display unit and passive buzzer unit needs to take microprocessor unit mould
The problem of two ports of block, circuit is enormously simplify, production cost is reduced；Whole key-press status detection process, which is used, simultaneously presses
Key disconnection-button presses the disconnection of-button release-button, in button detection process, by buzzer and LED intuitive displays
Observation, after contrast, judges that whether normal key-press status is, and solving traditional AD sample detectings method will to button uniformity
The problem of asking high, realizes the versatility of key-press status detection, while the high efficient and reliable of key-press status detection is substantially increased,
The maintenance cost in product later stage is greatly reduced simultaneously.
Brief description of the drawings
Below in conjunction with the accompanying drawings and specific embodiment the utility model is described in further detail, wherein：
Fig. 1 is the circuit frame figure of the utility model specific embodiment.
Fig. 2 is the circuit theory diagrams of the utility model specific embodiment key press detecting circuit module.
Fig. 3 is the circuit theory diagrams of the utility model specific embodiment button display module.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe.
As shown in figure 1, a kind of new and effective key-press status detection circuit of the present embodiment, for detect key-press status normally with
It is no, including be sequentially connected be used for detect the key press detecting circuit module of key-press status, for controlling microprocessor unit module
The comparison circuit module of reset, for the microprocessor unit module that is handled the key state information received and it is used for
The button display module whether current button is effectively pressed is shown, the input of the microprocessor module is also examined with the button
Another output end of slowdown monitoring circuit module is connected.
Further as shown in Fig. 2 the key press detecting circuit module, including button SW1,3rd resistor R3, the 4th resistance
R4 and the first electric capacity C1, the button SW1 one end connection power supply VCC, the button SW1 other end connection 3rd resistor R3
One end, the other end of the 3rd resistor R3 connects the MCU_TEST input pins of microprocessor module, the one of the 4th resistance R4
End is connected with the button SW1 and the 3rd resistor R3 common port d, the other end ground connection of the 4th resistance R4, first
Electric capacity C1 is in parallel with the 4th resistance R4, the button SW1,3rd resistor R3, the 4th resistance R4, the first electric capacity C1 it is public
End d output voltages are connected with the input JV of the comparison circuit module.
Further as shown in figure 3, the button display module, including LED display unit, passive buzzer unit, N-type three
Pole pipe Q1, first resistor R1 and second resistance R2；The base stage of the N-type triode Q1 and the output end MCU_ of microprocessor module
B/L connections, one end of the second resistance R2 is connected with N-type triode Q1 colelctor electrode, the other end of the second resistance R2
It is connected with first resistor R1 one end, the second resistance R2 and first resistor R1 is connected in series to, first electricity
The resistance R1 other end is connected with power supply VCC；The passive buzzer unit is connected in parallel with first resistor R1；It is described
The positive terminal of LED display unit is connected with N-type triode Q1 emitter stage, the negative pole end ground connection of the LED display unit.
The output end of the comparison circuit module is connected with the resetting pin of the microprocessor module, when the comparison circuit
When the input voltage of module input is more than the reference voltage of the comparison circuit module, the comparison circuit module exports low electricity
It is flat, it is single-chip microcomputer input reset signal, is resetted.
A kind of new and effective key-press status detection circuit, if within the period that button SW1 is pressed, passing through microprocessor
After the processing of device unit module, passive buzzer BUZZ length is rung, and LED length is bright, and after button is released, buzzer
BUZZ does not ring, and LED does not work, then it represents that key-press status is normal；If within the period that button SW1 is pressed,
After microprocessor unit resume module, buzzer BUZZ frequency responses, LED frequency is bright, then it represents that key-press status is not
Normally；If within the period that button SW1 is pressed, after microprocessor unit resume module, buzzer BUZZ length is rung,
LED length is bright, and after button is released, buzzer BUZZ frequency responses, LED frequency is bright, then it represents that press
Bonded state is abnormal.
Whole key-press status detection process is that button disconnection-button presses the disconnection of-button release-button, efficiently can may be used
The state of button is detected by ground.
It should be noted that simply preferred embodiment of the present utility model described above, the utility model not office
It is limited to above-mentioned embodiment, as long as it reaches technique effect of the present utility model with identical means, should all belongs to this practicality new
The protection domain of type.
Claims (4)
1. a kind of new and effective key-press status detection circuit, for detecting that whether normal key-press status is, it is characterised in that including according to
Secondary connection be used for detect the key press detecting circuit module of key-press status, the comparison for controlling microprocessor unit module resets
Circuit module, for the microprocessor unit module that is handled the key state information received and for show it is current by
The button display module whether key is effectively pressed, the input of the microprocessor module also with the key press detecting circuit module
Another output end be connected.
2. a kind of new and effective key-press status detection circuit according to claim 1, it is characterised in that：The button detection
Circuit module includes button SW1,3rd resistor R3, the 4th resistance R4 and the first electric capacity C1, one end connection electricity of the button SW1
Source VCC, the button SW1 other end connection 3rd resistor R3 one end, the other end of the 3rd resistor R3 connect micro- place
The MCU_TEST input pins of device module are managed, the 4th resistance R4 one end is public with the button SW1's and 3rd resistor R3
D is held to be connected, the other end ground connection of the 4th resistance R4, the first electric capacity C1 is in parallel with the 4th resistance R4, the button
SW1,3rd resistor R3, the 4th resistance R4, the first electric capacity C1 common port d output voltages and the input of the comparison circuit module
Hold JV connections.
3. a kind of new and effective key-press status detection circuit according to claim 1 or 2, it is characterised in that：The button
Display module includes LED display unit, passive buzzer unit, N-type triode Q1, first resistor R1 and second resistance R2；Institute
State N-type triode Q1 base stage and the output end MCU_B/L connections of microprocessor module, one end of the second resistance R2 and N
Type triode Q1 colelctor electrode connection, the other end of the second resistance R2 is connected with first resistor R1 one end, and described second
Resistance R2 is connected in series to first resistor R1, and the other end of the first resistor R1 is connected with power supply VCC；The nothing
Source buzzer unit is connected in parallel with first resistor R1；The positive terminal of the LED display unit and N-type triode Q1
Emitter stage connection, the LED display unit negative pole end ground connection.
4. a kind of new and effective key-press status detection circuit according to claim 1 or 2, it is characterised in that：The comparison
The output end of circuit module is connected with the resetting pin of the microprocessor module, when the input of the comparison circuit module input
When voltage is more than the reference voltage of the comparison circuit module, the comparison circuit module exports low level, is single-chip microcomputer input
Reset signal, is resetted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720145036.8U CN206505161U (en) | 2017-02-17 | 2017-02-17 | A kind of new and effective key-press status detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720145036.8U CN206505161U (en) | 2017-02-17 | 2017-02-17 | A kind of new and effective key-press status detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206505161U true CN206505161U (en) | 2017-09-19 |
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ID=59834282
Family Applications (1)
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| CN201720145036.8U Active CN206505161U (en) | 2017-02-17 | 2017-02-17 | A kind of new and effective key-press status detection circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108132435A (en) * | 2018-01-13 | 2018-06-08 | 蚌埠华特科技有限公司 | A kind of key testing device |
| CN109920355A (en) * | 2017-12-13 | 2019-06-21 | 佛山市顺德区美的电热电器制造有限公司 | Detection method and detection system for display board |
| CN111522282A (en) * | 2020-05-27 | 2020-08-11 | 北京无线电测量研究所 | Electronic product with shuttle flying knob |
| CN113589081A (en) * | 2021-07-30 | 2021-11-02 | 深圳市汇创达科技股份有限公司 | Control device for detecting pressure-sensitive key signal |
-
2017
- 2017-02-17 CN CN201720145036.8U patent/CN206505161U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109920355A (en) * | 2017-12-13 | 2019-06-21 | 佛山市顺德区美的电热电器制造有限公司 | Detection method and detection system for display board |
| CN108132435A (en) * | 2018-01-13 | 2018-06-08 | 蚌埠华特科技有限公司 | A kind of key testing device |
| CN111522282A (en) * | 2020-05-27 | 2020-08-11 | 北京无线电测量研究所 | Electronic product with shuttle flying knob |
| CN113589081A (en) * | 2021-07-30 | 2021-11-02 | 深圳市汇创达科技股份有限公司 | Control device for detecting pressure-sensitive key signal |
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