Response method of capacitance inductive touch button and control system

Abstract

The invention discloses a response method of a capacitance inductive touch button and a control system. The method comprises the following steps of: firstly, grouping the buttons with water and without water according to capacitances in the initial electrifying stage; and judging and responding movement according to threshold parameters of different groups and real-time capacitances of buttons. According to the invention, the influence of various external factors on the capacitances of the buttons are taken into consideration by grouping the buttons with water and without water, i.e., the capacitances are sampled during electrifying as a judging reference and associated parameters are updated at any time, so that mis-judgment caused by living beings such as insects climbing, or water drops and dampness and the like can be effectively prevented. The method is suitable for various conditions, the real-time initial capacitances of the buttons are affected by external environment, and artificial touch is represented that artificial touch capacitance influence value is superposed based on the real-time initial capacitances of the buttons. The initial capacitances are recorded by hardware, and the touch movement can be well judged when the buttons are triggered.

Description

[technical field] [0001] The invention belongs to the field of electronic technology, and in particular relates to a response method and a control system of a capacitance-sensing touch key. [Background technique] [0002] The basic principle of capacitive touch-sensing buttons is a relaxation oscillator that is continuously charged and discharged. If the button is not touched, the relaxation oscillator has a fixed charge and discharge cycle, and the frequency can be measured; if we touch the button with a finger or a touch pen, the dielectric constant of the capacitor will increase, the charge and discharge cycle will become longer, and the frequency will increase. It will be reduced accordingly, and the change of this frequency or cycle will be detected in the single-chip microcomputer, and the touch action can be detected. [0003] Therefore, the capacitance value of each channel can be indirectly converted into the electrical signal of the counter inside the single-chip ...

AI Technical Summary

Problems solved by technology

[0004] At present, in the common response method of capacitive sensing touch keys, when the detected capacitance value exceeds the preset threshold value, it is considered that the key is pressed and the corresponding key value is output. This method is prone to misjudgment, for example , In the case of insects and other creatures crawling over or water droplets, damp, etc., the capacitance value of the touch button will change significantly, which can easily be judged as a button press, resulting in a misoperation of outputting the corresponding button value

[0005] To sum up, in the prior art, the response method of common capacitive sensing touch keys is easy to misjudgment

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