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Capacitive sensing touch control key and key judging method thereof

A capacitive sensing and capacitive technology, applied in electrical components, electronic switches, pulse technology, etc., can solve the problems of occupying a lot of hardware resources, complex planning schemes, and high costs, so as to reduce the demand of MCU, suitable for low-cost applications, and occupying hardware The effect of low resources

Inactive Publication Date: 2016-02-03
ZHEJIANG MANSI NETWORK TECH CO LTD
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  • Abstract
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Problems solved by technology

[0009] To sum up the above, the existing design schemes have high requirements on the interface mode of the processor, occupy more hardware resources, or need to have a dedicated interface, or at least have an IO port with PWM function, the control is complex, the control of low power consumption is complicated, and the power consumption is low. high
[0010] The original planning scheme is relatively complicated, such as the dedicated capacitive button IC scheme needs to use a proprietary IC, or the PWM scheme needs to use several GPIO pins and need to have a PWM function, which is not conducive to cost control
Therefore, in the original design scheme, the requirements for the interface mode of the processor are relatively high, occupying more hardware resources, complex control, high power consumption, and high cost

Method used

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  • Capacitive sensing touch control key and key judging method thereof
  • Capacitive sensing touch control key and key judging method thereof
  • Capacitive sensing touch control key and key judging method thereof

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Embodiment 1

[0060] Embodiment one, such as Figure 5 As shown, it is calculated by matlab. When the parameter VUh we choose is close to U, it can bring about an increase in time variation, thereby improving the accuracy of detection.

[0061] From Figure 5 We can see that, assuming R=500K, C=10PF, ΔC=10PF brought by hand, Uh=0.5U, in the curve, if there is no pull-down resistor R2, that is, V=1, the time difference of charging reversal is 3.4us (As shown in the curve k1), the time difference of the charging reversal after the capacitance ΔC is brought by the human hand is twice the original (as shown in the curve k1'); and when the resistance R1 / R2=2 / 3, that is, V=1.6 see The time difference of the charging reversal is 5.3us (as shown in the curve k2), and the time difference of the charging reversal after the capacitance ΔC is brought by the hand is twice the original (as shown in the curve k2'); when the resistance R1 / R2=0.8, that is, V =1.8, the time difference of charging reversal ...

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Abstract

The invention relates to a capacitive sensing touch control key. The capacitive sensing touch control key includes a micro-control unit provided with a timer, and the micro-control unit includes a GPIO port and also includes a capacitor and a pull-up resistor; one end of the pull-up resistor is connected with the GPIO port, and the other end is connected with a high level; one end of the capacitor is connected with the GPIO port, and the other end is connected to the ground; and a common point of connection of the pull-up resistor, the capacitor and the GPIO port is connected with a capacitor key. The invention provides a capacitive sensing touch control circuit which occupies few hardware resources, has a strong anti-interference capability, and is convenient to control, relatively low in power consumption and relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of touch button manufacturing, in particular to a capacitive sensing touch button and a key judgment method thereof. Background technique [0002] The application of capacitive touch technology in various electronic devices has been relatively mature. For example, it has been widely used in the design of mobile phones, PAD, DVD, TV, washing machines and other fields. Capacitive touch technology using capacitive touch technology Keys are gradually replacing mechanical keys. Compared with traditional mechanical buttons, capacitive touch buttons are not only beautiful but also durable and have a long lifespan. The mechanism is simple and easy to install, and the cost is low. Compared with traditional mechanical buttons, capacitive touch buttons only need to be touched lightly. It can realize the switch control, quantization adjustment and even direction control of the buttons. In contrast, the mechanical keys...

Claims

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Application Information

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IPC IPC(8): H03K17/975
Inventor 王亮袁哲明
Owner ZHEJIANG MANSI NETWORK TECH CO LTD
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