Capacitance type touch press key and judging method thereof

Abstract

The invention relates to a touch press key and a judging method thereof. Either of each pair of touch press keys is connected with one end of a difference amplifier, and the other press key is connected with the other end of the difference amplifier, whereas the difference amplifier is used in the judging method of the touch press key to accurately and rapidly judge the position of the touch press key. The invention has simple structure and easy method, not only can accurately and rapidly judge the position of the touch press key but also introduces a capacitance type touch technology, thereby effectively prolonging the service life of the press key, and the operation becomes more convenient.

Description

technical field [0001] The invention relates to a touch button and a judging method thereof, in particular to a capacitive touch button and a judging method of whether the button is pressed. Background technique [0002] As we all know, buttons are currently a way to realize a human-computer interaction interface, and users can operate devices through buttons. Existing mechanical keys generally include a key trigger circuit and an MCU. When a key is pressed, the trigger circuit outputs the trigger level (high level or low level) to the MCU, and the MCU scans and recognizes it, and outputs a corresponding control signal to control the device. The principle of this kind of mechanical button is clear, the operation is simple, the price is low, especially the circuit design is very easy, so it is widely used in various fields. [0003] However, the current traditional mechanical buttons also have many disadvantages. For example, the user's pressing force is too large to damage...

AI Technical Summary

Problems solved by technology

[0003] However, the current traditional mechanical buttons also have many disadvantages. For example, the user's pressing force is too large to damage the button, and it cannot be operated effectively if it is too small; and the key switch generally uses shrapnel, and the shrapnel also has a limited service life. It will also be deformed and damaged

Furthermore, the mechanical buttons are easy to wear, complicated to install, and are easily affected by the external environment such as temperature, humidity, dust, etc., so they cannot meet the higher requirements of modern people.

In recent years, a kind of piezoelectric film touch button has also appeared. Although this kind of touch button prolongs the service life of the button to a certain extent, its cost is relatively expensive, and it is easy to be damaged, and it is also affected by the external environment, such as temperature and temperature. Humidity and other influences lead to a large error in the value of the output signal, resulting in misoperation

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