CN201797503U - Touch key of partial pressure capacitor - Google Patents
Touch key of partial pressure capacitor Download PDFInfo
- Publication number
- CN201797503U CN201797503U CN201020508321XU CN201020508321U CN201797503U CN 201797503 U CN201797503 U CN 201797503U CN 201020508321X U CN201020508321X U CN 201020508321XU CN 201020508321 U CN201020508321 U CN 201020508321U CN 201797503 U CN201797503 U CN 201797503U
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- CN
- China
- Prior art keywords
- touch key
- capacitor
- partial pressure
- chip microcomputer
- resistance
- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a touch key of a partial pressure capacitor, which comprises a touch key and a single chip microcomputer, and the applied fixed alternating-current voltage is connected with an AD port of the single chip microcomputer through a resistor R1, a capacitor Cx, the touch key, diodes D1 and D2 which are connected in parallel, a resistor R2, a resistor R3 and a capacitor C1.
Description
Technical field
The utility model relates to keyboard, mainly is meant a kind of partial pressure type capacitance touch button.
Background technology
Traditional mechanical key has easy to wear, installs complicatedly, is subjected to environmental change such as dust humidity to influence bigger shortcoming, and in order to overcome these shortcomings, touch key-press begins to be applied to the control of product.Existing touch key-press implementation has generally adopted sensitive switch to realize actuation of keys, and will install switching device additional between pcb and touch panel.This button not only assembles difficulty, cost is high, and owing between panel and pcb the slit is arranged, causes the water proof and dust proof effect undesirable.
Summary of the invention
The purpose of this utility model is exactly to provide a kind of switching device that do not adopt in order to overcome the deficiencies in the prior art, directly on the pcb plate printing can with the touch key-press of the tight combination of touch panel.
The realization the technical solution of the utility model is: this partial pressure type capacitance touch button comprises touch key-press and single-chip microcomputer (microprocessor MCU), wherein apply one fixedly alternating voltage behind resistance R 1, capacitor C x, touch key-press, diode connected in parallel D1, D2, connect the AD port of single-chip microcomputer again through resistance R 2, resistance R 3, capacitor C 1.
The beneficial effect that the utlity model has: omitted switching device, realized the seamless link of touch panel and pcb plate, had simple in structure, characteristics such as water proof and dust proof is effective, long service life.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model, wherein: 1 single-chip microcomputer, 2 touch key-presss, 3 alternating voltages.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, this partial pressure type capacitance touch button comprises touch key-press 2 and single-chip microcomputer (MCU) circuit, wherein the AD port of single-chip microcomputer (MCU) 1 divides two-way after capacitor C 1, resistance R 3, resistance R 2, one the tunnel connects alternating voltage through capacitor C x, resistance R 1, and button 2 is touched through diode connected in parallel D1, D2 contact in another road.
Capacitive reactance that the electric capacity that utilizes human body to carry produces and the Cx on Fig. 1 carry out dividing potential drop, single-chip microcomputer 1 utilizes the ad port to gather change in voltage and checks whether have the button the utility model that is triggered mainly to be made of following several parts: 1, single-chip microcomputer (MCU), mcu are that the core of this circuit detects button and carry out the algorithm that button handles all is to realize with mcu.2, the keypad on the PCB, the utility model directly button cloth on pcb, can cloth circular, square, the annular of hollow out in the middle of can also making, circuit links to each other with the A/D port of MCU according to Fig. 1.
Operation principle
By before Cx, applying a fixing alternating voltage 3, if human body touch is arranged to button 2, because the human body self capacity can produce capacitive reactance the voltage to single-chip microcomputer 1 port A/D is produced the dividing potential drop effect, MCU detects the variation of magnitude of voltage by the A/D port, just can the perception button, handle follow-up mechanism action.
Claims (1)
1. partial pressure type capacitance touch button, it is characterized in that comprising touch key-press and single-chip microcomputer, wherein apply one fixedly alternating voltage behind resistance R 1, capacitor C x, touch key-press, diode connected in parallel D1, D2, connect the AD port of single-chip microcomputer again through resistance R 2, resistance R 3, capacitor C 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020508321XU CN201797503U (en) | 2010-08-26 | 2010-08-26 | Touch key of partial pressure capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020508321XU CN201797503U (en) | 2010-08-26 | 2010-08-26 | Touch key of partial pressure capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201797503U true CN201797503U (en) | 2011-04-13 |
Family
ID=43852400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020508321XU Expired - Fee Related CN201797503U (en) | 2010-08-26 | 2010-08-26 | Touch key of partial pressure capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201797503U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522975A (en) * | 2011-11-29 | 2012-06-27 | 四川长虹电器股份有限公司 | Adaptive-environmental touch key circuit and key touch detection method |
| CN102868392A (en) * | 2011-07-06 | 2013-01-09 | 广东万和新电气股份有限公司 | Portability key circuit |
-
2010
- 2010-08-26 CN CN201020508321XU patent/CN201797503U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868392A (en) * | 2011-07-06 | 2013-01-09 | 广东万和新电气股份有限公司 | Portability key circuit |
| CN102868392B (en) * | 2011-07-06 | 2014-11-26 | 广东万和新电气股份有限公司 | Portability key circuit |
| CN102522975A (en) * | 2011-11-29 | 2012-06-27 | 四川长虹电器股份有限公司 | Adaptive-environmental touch key circuit and key touch detection method |
| CN102522975B (en) * | 2011-11-29 | 2014-08-20 | 四川长虹电器股份有限公司 | Adaptive-environmental touch key circuit and key touch detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20120826 |