CN206096382U - Many buttons switch detection circuit - Google Patents
Many buttons switch detection circuit Download PDFInfo
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- CN206096382U CN206096382U CN201621095551.1U CN201621095551U CN206096382U CN 206096382 U CN206096382 U CN 206096382U CN 201621095551 U CN201621095551 U CN 201621095551U CN 206096382 U CN206096382 U CN 206096382U
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- key switch
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Abstract
The utility model provides a many buttons switch detection circuit, the circuit includes: the MCU module, MCU module setting has a AD to detect the interface, with MCU serial module's RC oscillating circuit, RC oscillating circuit includes second resistance R2, third resistance R3 and first electric capacity C1, first key switch and second pushbutton switch, first key switch with second resistance R2 establishes ties, the second pushbutton switch with third resistance R3 establishes ties. This scheme in to present single chip microcomputer system commonly used to same signal line on the parallelly connected a plurality of different function button switches method of going on detecting has carried out the innovation and has improved, realize utilizing a numeral mouthful and several resistance -capacitances devices to discern the button action of the different resistances of multichannel, may not take singlechip AD resource for detection mode before preceding, need not take a plurality of numeral mouth resources and voltage conversion circuit yet, saved the cost, improved the resource usage efficiency of singlechip pin.
Description
Technical field
The utility model is related to switch detection circuit field, more particularly to a kind of many key switches detect circuit.
Background technology
At present using being frequently encountered the multiple different work(that need to parallel connection on same holding wire in the system of single-chip microcomputer
The situation that energy button is detected, generally using following two modes：First kind of way utilizes the simulation pin of single-chip microcomputer（AD mouths）
The resistance of different key is identified, shown in accompanying drawing 1；The second way utilizes amplifier or comparator by the level on holding wire
Carry out process and be decomposed into two or more data signals, recycling the multi-path digital mouth of single-chip microcomputer carries out detection identification, the institute of accompanying drawing 2
Show；But first method needs to take single-chip microcomputer volume cost just few AD mouths, and second method needs many increase conversion electricity
Road and multiple digital mouth resources.This patent devises a kind of new many key switch detection modes, by this new detection
Mode is realized recognizing the actuation of keys of the different resistances of multichannel with several capacitance resistance wares using a digital mouth, relative to first two
Detection mode can be not take up Chip Microcomputer A/D resource, it is not required that take multiple digital mouth resources and voltage conversion circuit, save
Cost, improves the resource utilization of single-chip microcomputer pin.
Utility model content
Based on this, the utility model provides a kind of many key switches and detects circuit.
A kind of many key switches detect circuit, and the circuit includes：
MCU module, the MCU module is provided with a Digital Detecting interface；
The RC oscillation circuits connected with the MCU module, the RC oscillation circuits include second resistance R2,3rd resistor R3
With the first electric capacity C1；
First key switch and the second key switch, first key switch is connected with second resistance R2, described
Second key switch is connected with 3rd resistor R3.
Preferably, the circuit also includes：
First resistor R1, with second resistance R2,3rd resistor R3 composition three-phase loop.
Preferably, the circuit also includes：
First test point A, is connected with first key switch with the second key switch.
Preferably, the MCU module is also connected with first key switch and second key switch.
Preferably, the quantity of the key switch can be N number of.
Preferably, it is that high resistant is input into detection mouth that the MCU arranges I/O, and the high resistant input detection mouth is can be defeated in high resistant
The detection interface that entrance and normal delivery outlet are toggled.
Preferably, the first checkpoint A is the test point that can be recognized by high level pull-up and by I/O.
Beneficial effect：
The utility model provides a kind of many key switches and detects circuit, and the circuit includes：MCU module, the MCU moulds
Block is provided with an AD detection interface；The RC oscillation circuits connected with the MCU module, the RC oscillation circuits include that second is electric
Resistance R2,3rd resistor R3 and the first electric capacity C1；First key switch and the second key switch, first key switch with it is described
Second resistance R2 is connected, and second key switch is connected with 3rd resistor R3, and this scheme is in current SCM system
The method that multiple difference in functionality key switches in parallel are detected on commonly used same holding wire has carried out innovation to be improved,
Realize recognizing the actuation of keys of the different resistances of multichannel with several capacitance resistance wares using a digital mouth, relative to detecting before front
Mode can be not take up Chip Microcomputer A/D resource, it is not required that take multiple digital mouth resources and voltage conversion circuit, save into
This, improves the resource utilization of single-chip microcomputer pin.
Description of the drawings
For the technical scheme for being illustrated more clearly that the utility model operation logic and use, below will to operation logic and
The accompanying drawing to be used needed for the technology for using is briefly described.It is clear that drawings in the following description are only this reality
With some new operation examples, for those of ordinary skill in the art, on the premise of not paying creative work, go back
Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram that the first key switch of the prior art detects circuit.
Fig. 2 is the circuit diagram that second key switch of the prior art detects circuit.
Fig. 3 is the circuit diagram that a kind of many key switches of the present utility model detect circuit.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model operation logic, the technical scheme in the utility model embodiment is entered
Row is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of the utility model protection.
Fig. 3 is refer to, based on this, the utility model provides a kind of many key switches and detects circuit.
A kind of many key switches detect circuit, and the circuit includes：
MCU module 100, the MCU module 100 is provided with a Digital Detecting interface；
The RC oscillation circuits connected with the MCU module 100, the RC oscillation circuits include second resistance R2, the 3rd electric
Resistance R3 and the first electric capacity C1；
First key switch S1 and the second key switch S2, the first key switch S1 go here and there with second resistance R2
Connection, the second key switch S2 connects with 3rd resistor R3.
Wherein in one embodiment, the circuit also includes：
First resistor R1, with second resistance R2,3rd resistor R3 composition three-phase loop.
Wherein in one embodiment, the circuit also includes：
First test point A, is connected with first key switch with the second key switch.
Wherein in one embodiment, the MCU module is also connected with first key switch and second button is opened
Close.
Wherein in one embodiment, the quantity of the key switch can be N number of.
Wherein in one embodiment, it is that high resistant is input into detection mouth that the MCU arranges I/O, and the high resistant is input into detection mouth
For the detection interface that can be toggled in high resistant input port and normal delivery outlet.
Wherein in one embodiment, the first checkpoint A is the detection that can be recognized by high level pull-up and by I/O
Point.
Fig. 3 is continued referring to, a kind of logic of many key switch detection modes of the present utility model is as follows：
1. connected mode
As illustrated, two buttons are made a distinction by the resistance R2 that connected, common tie point A is pulled up by high level
And recognized by I/O, I/O is connected to A points by the RC loops of R3 and C1；
2. logic is processed
It is that high resistant is input into detection mouth that I/O is arranged when MCU is flat, after it is low level to have recognized push button signalling i.e. A points, by I/
O switches to delivery outlet and externally exports high level, again switches back I/O mouths become high resistant input detection mouth afterwards, then to I/O
Mouthful level judged that, because before I/O mouths have C1 is charged, after I/O mouths are switched back, now button is still located
In conducting state, C1 can be discharged by A mouths, due to inconsistent by the discharge time of S1 and S2, so passing through the time
Differ to recognize that button just now is S1 or S2；
3. key switch and electronic device are selected
Key switch is not limited to the different types of switch for possessing conducting and disconnecting such as holding or non-maintenance, and quantity is not
Office is in more than 2 or multiple；
Electronic device is not limited to the value volume and range of product of capacitance-resistance, MCU sizes and function.
The utility model includes there is provided circuit described in a kind of many key switch detection circuits：MCU module, the MCU moulds
Block is provided with an AD detection interface；The RC oscillation circuits connected with the MCU module, the RC oscillation circuits include that second is electric
Resistance R2,3rd resistor R3 and the first electric capacity C1；First key switch and the second key switch, first key switch with it is described
Second resistance R2 is connected, and second key switch is connected with 3rd resistor R3.This scheme is in current SCM system
The method that multiple difference in functionality key switches in parallel are detected on commonly used same holding wire has carried out innovation to be improved,
Realize recognizing the actuation of keys of the different resistances of multichannel with several capacitance resistance wares using a digital mouth, relative to detecting before front
Mode can be not take up Chip Microcomputer A/D resource, it is not required that take multiple digital mouth resources and voltage conversion circuit, save into
This, improves the resource utilization of single-chip microcomputer pin.
The utility model operation logic is described in detail above, the explanation of above-mentioned operation logic is only intended to help
Understand method of the present utility model and its core concept；Simultaneously for one of ordinary skill in the art, according to the utility model
Thought, will change in specific embodiments and applications, in sum, this specification content should not be understood
It is to restriction of the present utility model.
Claims (7)
1. a kind of many key switches detect circuit, it is characterised in that the circuit includes：
MCU module, the MCU module is provided with a Digital Detecting interface；
The RC oscillation circuits connected with the MCU module, the RC oscillation circuits include second resistance R2,3rd resistor R3 and the
One electric capacity C1；
First key switch and the second key switch, first key switch is connected with second resistance R2, and described second
Key switch is connected with 3rd resistor R3.
2. many key switches according to claim 1 detect circuit, it is characterised in that the circuit also includes：
First resistor R1, with second resistance R2,3rd resistor R3 composition three-phase loop.
3. many key switches according to claim 1 detect circuit, it is characterised in that the circuit also includes：
First test point A, is connected with first key switch with the second key switch.
4. many key switches according to claim 1 detect circuit, it is characterised in that the MCU module is also connected with described
First key switch and second key switch.
5. many key switches according to claim 1 detect circuit, it is characterised in that the quantity of the key switch can be
It is N number of.
6. many key switches according to claim 1 detect circuit, it is characterised in that it is that high resistant is defeated that the MCU arranges I/O
Enter detection mouth, the high resistant input detection mouth is the detection interface that can be toggled in high resistant input port and normal delivery outlet.
7. many key switches according to claim 3 detect circuit, it is characterised in that the first checkpoint A is to lead to
The test point crossed high level pull-up and recognized by I/O.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621095551.1U CN206096382U (en) | 2016-09-30 | 2016-09-30 | Many buttons switch detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621095551.1U CN206096382U (en) | 2016-09-30 | 2016-09-30 | Many buttons switch detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206096382U true CN206096382U (en) | 2017-04-12 |
Family
ID=58482301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621095551.1U Active CN206096382U (en) | 2016-09-30 | 2016-09-30 | Many buttons switch detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206096382U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108536074A (en) * | 2018-06-15 | 2018-09-14 | 八方电气(苏州)股份有限公司 | The management method and system of unibus equipment |
| CN109900949A (en) * | 2019-02-01 | 2019-06-18 | 浙江蓝点动力科技有限公司 | A kind of key anti-interference processing method based on current detecting |
| CN113985272A (en) * | 2021-11-08 | 2022-01-28 | 合肥巨一动力系统有限公司 | Trinity electricity drives protection detection device that uncaps |
-
2016
- 2016-09-30 CN CN201621095551.1U patent/CN206096382U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108536074A (en) * | 2018-06-15 | 2018-09-14 | 八方电气(苏州)股份有限公司 | The management method and system of unibus equipment |
| CN109900949A (en) * | 2019-02-01 | 2019-06-18 | 浙江蓝点动力科技有限公司 | A kind of key anti-interference processing method based on current detecting |
| CN113985272A (en) * | 2021-11-08 | 2022-01-28 | 合肥巨一动力系统有限公司 | Trinity electricity drives protection detection device that uncaps |
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