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Induction key detecting method and detecting device

A detection method and technology of a detection device are applied in the direction of virtual key detection/prevention, keyboard-like device coding, coding, etc., which can solve the problems of high hardware cost and low flexibility, and achieve the effect of reducing hardware cost and improving flexibility.

Inactive Publication Date: 2017-05-31
JIANGSU QINHENG
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems, the present invention provides a sensing key detection device. In terms of hardware, by multiplexing the timers and counters that processors usually have, the technical effect of reducing the hardware cost is realized, and the high hardware cost and the problem of high hardware cost are solved. Technical issues with low flexibility

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  • Induction key detecting method and detecting device
  • Induction key detecting method and detecting device
  • Induction key detecting method and detecting device

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Embodiment 1

[0029] figure 1 It is a typical structure of a capacitive sensing button detection device, which mainly includes several buttons, a port selector, a pulse generating module and a processor, and a counter and a timer are arranged in the processor. The pulse generating module receives the key signal selected by the port selector to generate a pulse signal, the counter receives the pulse signal, the processor processes the pulse signal received in different time periods, and judges the state of the sensing key.

[0030] In one embodiment, the circuit structure of the pulse generation module is as figure 2 As shown, the constant current source a is used as a power supply to realize current control, so that the voltage linearity of the generated signal is improved, and b is a capacitive sensing button.

[0031] In this embodiment, the control module is controlled by software, which simplifies the hardware circuit, interrupts and collects data automatically, reduces errors, and im...

Embodiment 2

[0033] The method for detecting capacitive sensing buttons using the device of the above embodiment, by continuously collecting pulse signals and comparing them, determines whether the capacitance in the circuit of the pulse generating module changes, and accordingly, it can be known whether the sensing buttons are pressed, specifically including the following steps:

[0034] Step1, initialize the pulse generation module and processor;

[0035] Step2. Process several pulse signal data read from each channel to obtain the reference signal;

[0036] Step3, trigger the interrupt program;

[0037] Step4. In the interrupt program, read the pulse signal data once from the current channel as a real-time signal;

[0038] Step5. Comparing the reference signal and the real-time signal, if the absolute value of the difference between the two is greater than the set threshold, it means that the sensor button is pressed during the interruption time, otherwise it means that the sensor butt...

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Abstract

The invention discloses an induction key detecting method and detecting device. The detecting method comprises the steps that a pulse generating module receives a key-press signal selected by a port selector and generates a pulse signal, and a counter receives the pulse signal. The counter is arranged in a processor, and the processor processes pulse signals received at different time periods, and judges key-press states. According to the induction key detecting method and detecting device, software and hardware are combined, less hardware is used, and the hardware is highly integrated, compared with analog circuit connection, the interference between devices is reduced, and the sensitivity is high.

Description

technical field [0001] The invention relates to the technical field of inductive keys, in particular to an inductive key detection device and detection method. Background technique [0002] Capacitive sensing button is a common non-contact electronic button. Compared with traditional mechanical buttons, it has the advantages of waterproof, long life, stable performance, and sensitive response. Therefore, it is widely used in the control panel of various electronic and electrical products. among. [0003] The prior art capacitive sensing key applies the principle of "relaxation oscillator", but because it mainly relies on hardware components and has a complicated circuit structure, it causes technical problems of high hardware cost and inconvenient calibration. Contents of the invention [0004] Aiming at the above-mentioned technical problems, the present invention provides a sensing key detection device. On the hardware, by multiplexing the timers and counters that the p...

Claims

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Application Information

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IPC IPC(8): G06F3/044H03K17/96H03M11/00
CPCG06F3/044H03K17/9622H03M11/003
Inventor 王春华
Owner JIANGSU QINHENG
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