CN102394622A - Capacitive touch key and key judging method thereof - Google Patents
Capacitive touch key and key judging method thereof Download PDFInfo
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- CN102394622A CN102394622A CN2011102749872A CN201110274987A CN102394622A CN 102394622 A CN102394622 A CN 102394622A CN 2011102749872 A CN2011102749872 A CN 2011102749872A CN 201110274987 A CN201110274987 A CN 201110274987A CN 102394622 A CN102394622 A CN 102394622A
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Abstract
The invention relates to the technical field of manufacturing touch keys, in particular to a capacitive touch key and a key judging method thereof. The capacitive touch key comprises at least one induction port, a common port A, an MCU(Micro Control Unit) module with a timer and a charging/discharging circuit matched with the induction port, wherein one end of the charging/discharging circuit is connected with the common port A, the other end of the charging/discharging circuit is grounded, and the charging/discharging circuit is connected with one end of the induction port. The capacitive touch key is easy to realize, simple in structure and low in manufacturing cost. The key judging method of the capacitive touch key comprises the following steps of: (1), charging for gradually raising the level of the induction port until the input is high level detected at the induction port, obtaining a time t1; (2), discharging for gradually decreasing the level of the induction port until the input is low level detected at the induction port, obtaining a time t2; and (3), obtaining t1 and t2 for judging keys. The capacitive touch key has high accuracy, and can not result in that functions can not be realized due to damage of a mechanical structure and normal use of an electric appliance is influenced.
Description
Technical field
The present invention relates to touch key-press manufacturing technology field, be specifically related to a kind of capacitance type touch key and sub key method.
Background technology
Capacitance type touch key is very common, especially commonplace in household appliance technical field at electronics and electric field.Capacitance type touch key comprises a spring usually, between circuit board and guidance panel, and is in confined state, thereby tight attended operation panel and circuit board transmit response message according to changes in capacitance on the guidance panel.
The problem that prior art exists, complex structure, production cost is high, complex process.
Therefore, to the problem that exists in the prior art, needing badly provides the technology of a kind of capacitance type touch key and sub key method particularly important.
Summary of the invention
The objective of the invention is deficiency, provide a kind of simple in structure, the capacitance type touch key that production cost is low to prior art.
Another object of the present invention is the deficiency to prior art, provides a kind of method simple, the sub key method that is easy to realize.
The object of the invention is realized through following technical scheme.
A kind of capacitance type touch key; Comprise at least one sensor port, public port A, be provided with timer the MCU module, with the charge-discharge circuit of sensor port coupling; Said charge-discharge circuit one end is connected with public port A, other end ground connection, and charge-discharge circuit is connected with sensor port one end; Said charge-discharge circuit comprises resistance R, capacitor C and contact; Said resistance R one end is connected with public port A, and the said resistance R other end, capacitor C one end, contact one end are connected with said sensor port, said capacitor C other end ground connection.
Wherein, said sensor port comprises sensor port B and sensor port C, and said sensor port B, sensor port C are connected with the charge-discharge circuit that matches respectively.
Wherein, Said charge-discharge circuit comprises capacitor C 1, capacitor C 2, resistance R 1, resistance R 2, contact A, contact B; Said resistance R 1 one ends, resistance R 2 one ends are connected with public port A, and resistance R 1 other end, capacitor C 1 one ends, contact A one end are connected with sensor port B, capacitor C 1 other end ground connection; Resistance R 2 other ends, contact B one end, capacitor C 2 one ends are connected with sensor port C, capacitor C 2 other end ground connection.
Another object of the present invention, realize through following technical scheme:
A kind of sub key method of capacitance type touch key may further comprise the steps:
Step 1, public port A is set is low level; Sensor port is the high resistant input state, opens the timer in the MCU module, even exist side by side public port A output high level; Charge to capacitor C through resistance R this moment; The sensor port level raises gradually, detects when being input as high level to sensor port, stops timer and clocks and obtain time t1;
Step 2, it is high level that sensor port is set, public port A is the high resistant input state; Open the timer in the MCU module; Sensor port converts the high resistant input state to even exist side by side, and this moment, capacitor C was discharged through resistance R, and the sensor port level reduces gradually; Detect when being input as low level to sensor port, stopping to clock obtains time t2;
Step 3, t1 and t2 are combined into a measuring period, the time sum of t1 when obtaining zero load and t2; When load, charge-discharge circuit detects, and obtains t3 and t4; T3 and t4 and t1 and the contrast of t2 sum are depressed if t3 and t4, then judge button greater than t1 and t2; If t3 compares with t2 with t1 with t4, no change judges that then button do not depress.
Beneficial effect of the present invention:
A kind of capacitance type touch key; Comprise at least one sensor port, public port A, be provided with timer the MCU module, with the charge-discharge circuit of sensor port coupling; Said charge-discharge circuit one end is connected with public port A, other end ground connection, and charge-discharge circuit is connected with sensor port one end; Said charge-discharge circuit comprises resistance R, capacitor C and contact; Said resistance R one end is connected with public port A, and the said resistance R other end, capacitor C one end, contact one end are connected with said sensor port, said capacitor C other end ground connection.
The present invention compares mechanical structure of the prior art, realizes easily, and is simple in structure, low cost of manufacture.
A kind of sub key method of capacitance type touch key may further comprise the steps: step 1, public port A is set is low level, and sensor port is the high resistant input state; Open the timer in the MCU module; The public port A output high level even exist side by side, charge to capacitor C through resistance R this moment, and the sensor port level raises gradually; Detect when being input as high level to sensor port, stop timer and clock and obtain time t1; Step 2, sensor port is set is high level; Public port A is the high resistant input state, opens the timer in the MCU module, even the sensor port of existing side by side converts the high resistant input state to; This moment, capacitor C was discharged through resistance R; The sensor port level reduces gradually, detects when being input as low level to sensor port, stops timer and clocks and obtain time t2; The time sum of step 3, the t1 when obtaining zero load and t2, when load, charge-discharge circuit detects, and obtains t3 and t4; T3 and t4 and t1 and the contrast of t2 sum are depressed if t3 and t4, then judge button greater than t1 and t2; If t3 compares with t2 with t1 with t4, no change judges that then button do not depress.
The present invention compares mechanical compression method of the prior art, and by circuit identification, accuracy is high, can not cause realizing function owing to mechanical structure is damaged, and influences the normal use of electrical equipment.
Description of drawings
Utilize accompanying drawing that the present invention is described further, but the embodiment in the accompanying drawing does not constitute any restriction of the present invention.
Fig. 1 is the structural representation of a kind of capacitance type touch key of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is elaborated.
Embodiment 1
As Fig. 1, shown in; A kind of capacitance type touch key, comprise at least one sensor port, public port A, be provided with timer the MCU module, with the charge-discharge circuit of sensor port coupling, said charge-discharge circuit one end is connected with public port A; Other end ground connection; Charge-discharge circuit is connected with sensor port one end, and said charge-discharge circuit comprises resistance R, capacitor C and contact, and said resistance R one end is connected with public port A; The said resistance R other end, capacitor C one end, contact one end are connected with said sensor port, said capacitor C other end ground connection.
The present invention compares mechanical structure of the prior art, realizes easily, and is simple in structure, low cost of manufacture.
Wherein, said sensor port comprises sensor port B and sensor port C, and said sensor port B, sensor port C are connected with the charge-discharge circuit that matches respectively.The present invention can be provided with a plurality of sensor port, can realize the multiple point touching induction.
Wherein, Said charge-discharge circuit comprises capacitor C 1, capacitor C 2, resistance R 1, resistance R 2, contact A, contact B; Said resistance R 1 one ends, resistance R 2 one ends are connected with public port A, and resistance R 1 other end, capacitor C 1 one ends, contact A one end are connected with sensor port B, capacitor C 1 other end ground connection; Resistance R 2 other ends, contact B one end, capacitor C 2 one ends are connected with sensor port C, capacitor C 2 other end ground connection.
Embodiment 2
A kind of sub key method of capacitance type touch key may further comprise the steps:
Step 1, public port A is set is low level; Sensor port is the high resistant input state, opens the timer in the MCU module, even exist side by side public port A output high level; Charge to capacitor C through resistance R this moment; The sensor port level raises gradually, detects when being input as high level to sensor port, stops timer and clocks and obtain time t1;
Step 2, it is high level that sensor port is set, public port A is the high resistant input state; Open the timer in the MCU module; Sensor port converts the high resistant input state to even exist side by side, and this moment, capacitor C was discharged through resistance R, and the sensor port level reduces gradually; Detect when being input as low level to sensor port, stopping to clock obtains time t2;
Step 3, t1 and t2 are combined into a measuring period, the time sum of t1 when obtaining zero load and t2; When load, charge-discharge circuit detects, and obtains t3 and t4; T3 and t4 and t1 and the contrast of t2 sum are depressed if t3 and t4, then judge button greater than t1 and t2; If t3 compares with t2 with t1 with t4, no change judges that then button do not depress.
Detect each sensor port capacitance variations respectively, can realize many induction points touch recognition.
Should be noted that at last; Above embodiment is only in order to technical scheme of the present invention to be described but not to the restriction of protection range of the present invention; Although the present invention has been done detailed description with reference to preferred embodiment; Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the essence and the scope of technical scheme of the present invention.
Claims (4)
1. capacitance type touch key; It is characterized in that: comprise at least one sensor port, public port A, be provided with timer the MCU module, with the charge-discharge circuit of sensor port coupling; Said charge-discharge circuit one end is connected with public port A, other end ground connection, and charge-discharge circuit is connected with sensor port one end; Said charge-discharge circuit comprises resistance R, capacitor C and contact; Said resistance R one end is connected with public port A, and the said resistance R other end, capacitor C one end, contact one end are connected with said sensor port, said capacitor C other end ground connection.
2. a kind of capacitance type touch key according to claim 1 is characterized in that: said sensor port comprises sensor port B and sensor port C, and said sensor port B, sensor port C are connected with the charge-discharge circuit that matches respectively.
3. a kind of capacitance type touch key according to claim 2; It is characterized in that: said charge-discharge circuit comprises capacitor C 1, capacitor C 2, resistance R 1, resistance R 2, contact A, contact B; Said resistance R 1 one ends, resistance R 2 one ends are connected with public port A, and resistance R 1 other end, capacitor C 1 one ends, contact A one end are connected with sensor port B, capacitor C 1 other end ground connection; Resistance R 2 other ends, contact B one end, capacitor C 2 one ends are connected with sensor port C, capacitor C 2 other end ground connection.
4. the sub key method of a capacitance type touch key according to claim 1 is characterized in that: may further comprise the steps:
Step 1, public port A is set is low level; Sensor port is the high resistant input state, opens the timer in the MCU module, even exist side by side public port A output high level; Charge to capacitor C through resistance R this moment; The sensor port level raises gradually, detects when being input as high level to sensor port, stops timer and clocks and obtain time t1;
Step 2, sensor port is set is high level; Public port A is the high resistant input state, opens the timer in the MCU module, even the sensor port of existing side by side converts the high resistant input state to; This moment, capacitor C was discharged through resistance R; The sensor port level reduces gradually, detects when being input as low level to sensor port, stops to clock obtaining time t2;
Step 3, t1 and t2 are combined into a measuring period, and the time sum of t1 when obtaining zero load and t2 is when load; Charge-discharge circuit detects, and obtains t3 and t4, t3 and t4 and t1 and the contrast of t2 sum; If t3 and t4, then judge button greater than t1 and t2 and depress, if t3 compares with t2 with t1 with t4; No change judges that then button do not depress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110274987.2A CN102394622B (en) | 2011-09-16 | 2011-09-16 | Capacitive touch key and key judging method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110274987.2A CN102394622B (en) | 2011-09-16 | 2011-09-16 | Capacitive touch key and key judging method thereof |
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| CN102394622A true CN102394622A (en) | 2012-03-28 |
| CN102394622B CN102394622B (en) | 2014-03-19 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389802A (en) * | 2013-07-29 | 2013-11-13 | Tcl集团股份有限公司 | Multichip compatible method and device based on capacitive touch press keys as well as electrical equipment |
| CN104184448A (en) * | 2014-07-31 | 2014-12-03 | 松下家电研究开发（杭州）有限公司 | Control method for preventing false detection of capacitive touch button, and electric appliance |
| CN105306038A (en) * | 2015-11-02 | 2016-02-03 | 浙江漫思网络科技有限公司 | Capacitive sensing touch control key and key judging method thereof |
| CN109254699A (en) * | 2018-08-28 | 2019-01-22 | 苏州金螳螂文化发展股份有限公司 | A kind of touch sensible detection method and system |
| CN114221644A (en) * | 2022-02-22 | 2022-03-22 | 杭州炬源智能科技有限公司 | Intelligent water meter with touch keys and detection method of touch keys |
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| CN201238405Y (en) * | 2008-05-01 | 2009-05-13 | 美的集团有限公司 | Touch control induction circuit of induction cooker |
| CN101499793A (en) * | 2008-01-31 | 2009-08-05 | 杭州利尔达科技有限公司 | Capacitor induction type touch press-key based on MCU and measuring method for touch press-key capacitance |
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| US20060117661A1 (en) * | 2002-09-12 | 2006-06-08 | Goran Hansson | Capacitive squeeze protecting device |
| CN201167310Y (en) * | 2008-01-30 | 2008-12-17 | 宁波海诚电器有限公司 | Human body induction type touch key-press circuit for air conditioner |
| CN101499793A (en) * | 2008-01-31 | 2009-08-05 | 杭州利尔达科技有限公司 | Capacitor induction type touch press-key based on MCU and measuring method for touch press-key capacitance |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389802A (en) * | 2013-07-29 | 2013-11-13 | Tcl集团股份有限公司 | Multichip compatible method and device based on capacitive touch press keys as well as electrical equipment |
| CN103389802B (en) * | 2013-07-29 | 2017-11-10 | Tcl集团股份有限公司 | Multi-chip compatibility method, device and electric equipment based on capacitance type touch key |
| CN104184448A (en) * | 2014-07-31 | 2014-12-03 | 松下家电研究开发（杭州）有限公司 | Control method for preventing false detection of capacitive touch button, and electric appliance |
| CN104184448B (en) * | 2014-07-31 | 2017-07-21 | 松下家电研究开发（杭州）有限公司 | Prevent control method and electrical appliance that capacitance type touch key flase drop is known |
| CN105306038A (en) * | 2015-11-02 | 2016-02-03 | 浙江漫思网络科技有限公司 | Capacitive sensing touch control key and key judging method thereof |
| CN109254699A (en) * | 2018-08-28 | 2019-01-22 | 苏州金螳螂文化发展股份有限公司 | A kind of touch sensible detection method and system |
| CN114221644A (en) * | 2022-02-22 | 2022-03-22 | 杭州炬源智能科技有限公司 | Intelligent water meter with touch keys and detection method of touch keys |
| CN114221644B (en) * | 2022-02-22 | 2023-08-29 | 杭州炬源智能科技有限公司 | Intelligent water meter with touch keys and detection method of touch keys |
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| CN102394622B (en) | 2014-03-19 |
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