CN111459340A - Touch key anti-interference processing method and touch key device - Google Patents
Touch key anti-interference processing method and touch key device Download PDFInfo
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- CN111459340A CN111459340A CN202010296269.4A CN202010296269A CN111459340A CN 111459340 A CN111459340 A CN 111459340A CN 202010296269 A CN202010296269 A CN 202010296269A CN 111459340 A CN111459340 A CN 111459340A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Abstract
The invention provides a touch key anti-interference processing method and a touch key device, wherein the touch key anti-interference processing method comprises the steps of detecting the untouched electric signal data of a touch key within a certain time when the touch key is untouched; calculating to obtain interference frequency according to the electric signal data; adjusting the sampling frequency of the touch key to be more than or equal to 2 times of the interference frequency; and sampling the electric signal data of the touch key in the sampling frequency, comparing the electric signal data with a preset threshold range, and judging whether the key is triggered. The touch key anti-interference processing method and the touch key device provided by the invention can be used for calculating the interference frequency after acquiring the untouched electric signal data of the touch key for a certain time, further determining the sampling frequency to ensure the uniformity of data sampling, and enabling the average value of the sampling to be close to the central standard value of the waveform of the interference noise of the untouched electric signal data, thereby realizing the minimization of the interference influence on the change detection value of the touch key electric signal.
Description
Technical Field
The invention belongs to the field of touch keys, and particularly relates to an anti-interference processing method for a touch key and a touch key device.
Background
With the pursuit of higher and higher product functions, the application of the touch key in the household appliance products is more and more extensive. The conventional touch key detection principle is realized by detecting the capacitance change of a circuit before and after a finger is pressed, the capacitance change is finally fed back to the inside of the single chip microcomputer to be the change of an electric signal, and the AD module in the single chip microcomputer finally realizes the detection of the electric signal. When a user presses a key, the electric signal value detected by the single chip microcomputer is changed in an increasing mode, if the difference value of the electric signals before and after the change is larger than or equal to a preset threshold value lowest value and smaller than or equal to a threshold value highest value, the key is judged to be successfully triggered, and if the difference value is smaller than the threshold value lowest value or larger than the threshold value highest value, the key is judged to be an invalid key.
However, in the practical application process, the change of the electrical signal caused before and after the touch key is pressed by the finger is actually a relatively small value, which means that the detection of the touch key is relatively easy to be interfered by the outside world. In order to prevent the touch key from being triggered by mistake, the set judgment threshold value cannot be too low. Therefore, in the prior art, the condition that the change detection value of the electric signal of the touch key is lower than the threshold value due to interference and the touch key cannot be triggered exists.
The sources of external interference are various, the current main means is to optimize from the aspects of hardware layout, wiring and the like, but the setting of the threshold value is sensitive, and if the electric signal detected by the singlechip is fluctuated, the normal detection of the touch key can be influenced.
Disclosure of Invention
The invention aims to provide an anti-interference processing method for a touch key, which aims to solve the problem that in the prior art, the change detection value of an electric signal of the touch key is lower than a threshold value due to interference, so that the touch key cannot be triggered.
In order to achieve the purpose, the invention adopts the technical scheme that: the anti-interference processing method for the touch keys comprises the following steps:
detecting the untouched electric signal data of the touch key within a certain time when the touch key is untouched;
calculating interference frequency according to the untouched electric signal data;
adjusting the sampling frequency of the touch key to be more than or equal to 2 times of the interference frequency;
and sampling the electric signal data of the touch key in the sampling frequency, comparing the electric signal data with a preset threshold range, and judging whether the key is triggered.
Further, calculating an interference frequency according to the untouched electric signal data, specifically including:
finding the maximum value and the minimum value of the electric signal data which are not touched, and taking the average value of the maximum value and the minimum value as the central standard value of the interference noise;
counting zero-crossing point information of the waveform of the interference noise within a certain time according to the central standard value and a preset deviation value;
and calculating the interference frequency according to the zero crossing point information.
Further, the calculation of the interference frequency and the detection of the related untouched electrical signal data are performed after the touch key is turned on in the environment adaptive mode.
Preferably, the environment adaptive mode is manually started by a user or is started at regular time.
Further, when the touch key is in the environment adaptive mode, the single chip microcomputer of the touch key stops other work, and only the interference frequency calculation, the detection of the relevant untouched electric signal data and the adjustment of the sampling frequency are carried out.
Preferably, the electrical signal data is voltage data.
The invention also aims to provide a touch key device which adopts the touch key anti-interference processing method to perform anti-interference processing.
Further, the touch key device includes:
the acquisition module acquires the electric signal data of the touch key according to the noise sampling frequency or the sampling frequency;
and the single chip microcomputer controls the acquisition module to acquire electric signal data, analyzes the electric signal data to complete the adjustment of the sampling frequency, and judges whether the touch key is triggered.
Preferably, the collection module is a voltage collection module.
Compared with the prior art, the anti-interference processing method for the touch key and the touch key device have the advantages that:
1. the method collects the untouched electric signal data of the touch key in a certain time, calculates the interference frequency after obtaining the untouched electric signal data of the touch key in a certain time, and further adjusts the sampling frequency of AD sampling to ensure the uniformity of data sampling, so that the average value of the sampling is close to the central standard value of the waveform of the interference noise of the untouched electric signal data, thereby realizing the minimization of the interference influence on the change detection value of the electric signal of the touch key, and improving the antijamming capability of the electric signal change detection of the touch key and the judgment accuracy of touch operation;
2. the self-adaptive mode of the touch key environment is introduced, so that the environment compatibility of touch key detection is improved, and the method can adapt to different hardware designs and more complex application environments;
3. after entering a touch key environment self-adaptive mode, the singlechip stops other work and performs data acquisition on the electric signals of the AD sampling channel corresponding to the touch key at the fastest operation frequency of the singlechip; the sampling frequency can be adjusted to be higher according to the performance of the single chip microcomputer, and therefore the performance of the single chip microcomputer is fully utilized, and the sampling numerical value is finer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart of an anti-interference processing method for a touch key according to the present invention;
fig. 2 is a schematic diagram illustrating a periodicity of external superimposed interference of a touch key according to the present invention;
FIG. 3 is a schematic diagram of positive and negative sampling offsets of a conventional fixed frequency detection for a touch key according to the present invention;
fig. 4 is a schematic diagram of a sampling frequency determination method of the anti-interference processing method for touch keys according to the present invention;
fig. 5 is a schematic diagram of a method for adjusting the single chip microcomputer AD equalization sampling according to the sampling frequency in the anti-interference processing method for touch keys provided by the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to fig. 5, an anti-interference processing method for a touch key according to an embodiment of the present invention will be described.
The anti-interference processing method for the touch keys comprises the following steps:
detecting the untouched electric signal data of the touch key within a certain time when the touch key is untouched;
calculating to obtain interference frequency according to the untouched electric signal data;
adjusting the sampling frequency of the touch key to be more than or equal to 2 times of the interference frequency;
and sampling the electric signal data of the touch key in a sampling frequency, comparing the electric signal data with a preset threshold range, and judging whether the key is triggered.
For the touch key, the conventional external interference sources are numerous, such as power noise, communication noise, etc., and such interference has a common property: the periodicity, that is, the noise may be superimposed on the channel electrical signal sampled by the touch key at a certain period, and further interfere and affect the sampling value, as shown in fig. 2.
In conventional touch key detection, basically, an electrical signal of a touch key channel is sampled at a fixed frequency, and if a sampling period is close to or in a multiple relation with an interference period, most sampling points may be sampled at an interference peak value, or all sampling points are positive sampling offset or negative sampling offset, so that an electrical signal value detected by a key is higher or lower, as shown in fig. 3.
Higher or lower electrical signal samples can interfere with and affect the detection of touch keys. When the touch key is pressed down, if the sampling value of the electrical signal is low, the difference value of the electrical signal is too small to reach the lowest threshold value for judging the pressing down of the touch key, and the touch key is invalid; if the sampling value of the electrical signal is higher, when the key is released, the difference value of the electrical signal may be too large to exceed the highest value of the threshold for determining the release of the touch key, and the touch key may also fail.
In order to solve the problem of sampling offset, the invention firstly uses a singlechip to start to collect the electric signal data which is not touched for a certain time T. The AD sampling channel corresponding to the touch key can be adopted for collecting the electric signal data, and other unused channels can also be adopted. Preferably, the electrical signal data is collected as voltage data. Further, before the single chip microcomputer starts to collect the electric signal data which is not touched for a certain time T, a touch key environment self-adaption mode can be introduced, and the mode can be entered by the single chip microcomputer manually or at regular time. And a touch key environment self-adaption mode is introduced, so that the environment compatibility of touch key detection is improved, and the method can adapt to different hardware designs and more complex application environments.
After the singlechip collects the untouched electric signal data within a certain time T, the fluctuation data of the current electric signal is analyzed, the highest point value and the lowest point value of the fluctuation data are determined, and then the average value of the two values is taken as the central standard value of the waveform of the interference noise. Each intersection point of the central standard value and the fluctuation curve of the untouched electric signal data at a certain time T is a standard zero crossing point, and the electric signal at the standard zero crossing point is likely to fluctuate due to the existence of external interference, so that the zero crossing point is deviated, therefore, a certain preset deviation value range needs to be given to the central standard value to count the zero crossing point information of the waveform of interference noise in the untouched electric signal data at the certain time T, the interference frequency F is calculated according to the zero crossing point information, and the false recognition caused by the fluctuation of the electric signal data at the standard zero crossing point is avoided. 5% can be selected as the deviation range, and can be adjusted according to actual test.
Taking a certain deviation value range from the central standard value to count the zero crossing point of the interference noise in the untouched electrical signal data within a certain time T, specifically integrating each time period corresponding to the data within the certain deviation value range from the central standard value into each time point, namely the zero crossing point, and calculating the cycle frequency of the zero crossing point, namely the interference frequency F, according to the information of each zero crossing point as a whole, as shown in FIG. 4. The zero-crossing point is a point in the deviation value range shown by the dashed line on fig. 4, and the zero-crossing point information includes time at the zero-crossing point, the zero-crossing times, and the like.
And after the interference frequency F is determined, the singlechip exits the self-adaptive mode, adjusts the sampling frequency of the singlechip AD to enable the sampling frequency to be more than or equal to 2 times of the interference frequency F, samples the data value of the electric signal in the sampling frequency, compares the data value with a preset threshold range, and judges whether the key is triggered.
And further, sampling the data value of the electric signal in a sampling frequency, and when the touch key is pressed down, if the sampling value of the electric signal is greater than the preset threshold value, and when the key is released, the sampling value of the electric signal is less than the preset threshold value, determining that the touch key is triggered.
After the interference frequency F is calculated and the sampling frequency which is more than or equal to 2F is obtained, although the sampling value of the electrical signal data cannot eliminate the external interference by percent, compared with the existing method for sampling the electrical signal of the touch key channel at a fixed frequency, if the sampling period is close to or in a multiple relation with the interference period, most of sampling points are possibly at the peak value of the interference or are all positive sampling offset or negative sampling offset, and further the electrical signal value detected by the key is higher or lower, the invention samples the electrical signal value at the sampling frequency which is more than or equal to 2F, at the moment, although the sampled value still has positive sampling and negative sampling, the sampling times between the two are relatively balanced, the positive-negative frequency is basically kept once, and finally the averaged value is close to the central standard value of the interference noise of the electrical signal which is not touched by the touch key, therefore, the influence of interference on the change detection value of the touch key electric signal is minimized, and the anti-interference capability of the change detection of the touch key electric signal and the judgment accuracy of touch operation are improved. As shown in particular in fig. 5.
As an embodiment of the invention, in order to fully utilize the performance of the single chip microcomputer, after the touch key environment self-adaptive mode is entered, the single chip microcomputer stops other work, and acquires the electric signal data which is not touched for a certain time T at the fastest running frequency of the single chip microcomputer, and carries out the processing of calculating the interference frequency and adjusting the sampling frequency. Finally, the sampling frequency can be adjusted to be higher according to the performance of the single chip microcomputer, so that the performance of the single chip microcomputer is utilized, and the sampling value is finer.
The invention also provides a touch key device, and the anti-interference processing method for the touch key is adopted to carry out anti-interference processing.
Further, the touch key device includes:
the acquisition module acquires the electric signal data of the touch key according to the noise sampling frequency or the sampling frequency;
and the singlechip is used for controlling the acquisition module to acquire electric signal data, analyzing the electric signal data to complete the adjustment of the sampling frequency and judging whether the touch key is triggered.
Preferably, the collection module is a voltage collection module.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The anti-interference processing method for the touch keys is characterized by comprising the following steps:
detecting the untouched electric signal data of the touch key within a certain time when the touch key is untouched;
calculating interference frequency according to the untouched electric signal data;
adjusting the sampling frequency of the touch key to be more than or equal to 2 times of the interference frequency;
and sampling the electric signal data of the touch key in the sampling frequency, comparing the electric signal data with a preset threshold range, and judging whether the key is triggered.
2. The method for anti-interference processing of touch keys according to claim 1, wherein calculating an interference frequency according to the untouched electrical signal data specifically comprises:
finding the maximum value and the minimum value of the electric signal data which are not touched, and taking the average value of the maximum value and the minimum value as the central standard value of the interference noise;
counting zero-crossing point information of the waveform of the interference noise within a certain time according to the central standard value and a preset deviation value;
and calculating the interference frequency according to the zero crossing point information.
3. The touch key anti-tamper processing method of claim 1, wherein the calculation of the interference frequency and the detection of the associated untouched electrical signal data are performed after the touch key is in the environment-adaptive mode.
4. The method for handling interference resistance of touch keys as claimed in claim 3, wherein the environment adaptive mode is manually turned on by a user or is turned on at regular time.
5. The method according to claim 3, wherein when the touch key is in the environment adaptive mode, the single-chip microcomputer of the touch key stops other operations and performs only the calculation of the interference frequency, the detection of the related untouched electrical signal data, and the adjustment of the sampling frequency.
6. The method for handling interference resistance of touch keys of claim 1, wherein the electrical signal data is voltage data.
7. A touch key device, characterized in that the anti-interference processing method of any one of claims 1 to 6 is adopted to perform anti-interference processing.
8. The touch key device of claim 7, comprising:
the acquisition module acquires the electric signal data of the touch key according to the noise sampling frequency or the sampling frequency;
and the single chip microcomputer controls the acquisition module to acquire electric signal data, analyzes the electric signal data to complete the adjustment of the sampling frequency, and judges whether the touch key is triggered.
9. The touch key of claim 8, wherein the collection module is a voltage collection module.
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| CN202010296269.4A CN111459340A (en) | 2020-04-15 | 2020-04-15 | Touch key anti-interference processing method and touch key device |
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Cited By (2)
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| CN113453251A (en) * | 2021-05-25 | 2021-09-28 | 新华三技术有限公司成都分公司 | Wireless network equipment and networking method |
| CN115549680A (en) * | 2022-11-28 | 2022-12-30 | 南京沁恒微电子股份有限公司 | Anti-interference detection method and detection chip for touch keys |
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Application publication date: 20200728 |