基于电容式触摸按键系统的研究与应用

发布时间：2018-06-17 20:33

本文选题：电容式 + 触摸按键　；参考：《武汉轻工大学》2013年硕士论文

【摘要】：随着电子科学技术的不断发展，电容式触摸按键已经越来越多的应用于各种电子产品设计中。传统机械按键输入方式的电路复杂，并且容易磨损、使用寿命低，，已经逐渐被设计者所抛弃。而电容式触摸按键技术电路简单、操作方便，并且灵敏准确，很好的弥补了机械按键的缺点和不足。但是，目前的电容式触摸按键技术仍处于改进和完善的阶段，漂移现象一直是电容式触摸技术的最大缺点。而与之相关的电容式触摸按键的灵敏度、防噪声干扰、防水干扰等难题都在不同程度上阻碍了该技术进一步的发展。因此，这些问题都是该技术急需解决和改进的地方。本文重点介绍一种具有较好抗噪声及防水干扰能力的电容式触摸按键的触摸算法，并通过对触摸按键数据精度、检测速度、参考电压以及电容充放电频率等参数的研究以实现触摸按键的使用灵敏、反映快速、判断精确。同时，在基于电容式触摸按键系统的研究上，设计了一款可以作为彩灯玩具或彩灯装饰的七彩触摸灯，通过实例设计来调试并验证触摸按键系统的实际使用效果。触摸彩灯选用BF6911AS10电容式触摸控制芯片作为主控，系统采用锂电池供电，通过多个触摸按键以及红外遥控结合系统软件的编写完成开关机、颜色循环、颜色改变等功能。彩灯的颜色变换则是利用芯片的GPIO口模拟脉冲宽带调制功能，从而通过主控控制红绿蓝三色LED灯头各自的占空比而得以实现的。同时系统采用低功耗待机模式，并能通过充电器对供电锂电池进行充电。研究和测试结果表明，所设计的电容式触摸按键响应速度快、检测精度准确、抗干扰能力强，并且有一定的防水抗噪能力。该研究有效的改善和弥补了当前电容式触摸按键技术的不足之处，并使该技术拥有了更大的应用价值与市场前景。
[Abstract]:With the development of electronic science and technology, capacitive touch keys have been more and more used in the design of electronic products. The traditional mechanical keystroke input circuit is complex, easy to wear, low service life, and has been abandoned by designers. The capacitive touch keystroke circuit is simple, easy to operate, sensitive and accurate, which makes up for the shortcomings of mechanical keystroke. However, the current capacitive touch keystroke technology is still in the stage of improvement and perfection, drift phenomenon has always been the biggest disadvantage of capacitive touch technology. The sensitivity of capacitive touch keystrokes, anti-noise interference, waterproof interference and other problems have hindered the further development of the technology in varying degrees. Therefore, these problems are urgently needed to solve and improve the technology. This paper mainly introduces a touch algorithm of capacitive touch keystroke, which has the ability of resisting noise and waterproof interference, and detects the speed through the precision of the data of touch key. The parameters such as reference voltage and capacitance charge / discharge frequency are studied to realize the sensitive use of touch keys, fast response and accurate judgment. At the same time, on the basis of capacitive touch keystroke system, a colorful touch lamp which can be used as color lamp toy or color lamp decoration is designed, and the actual use effect of touch key system is tested and verified by an example design. The touch color lamp uses BF6911AS10 capacitive touch control chip as the main control, the system uses lithium battery power supply, through the multi-touch keys and infrared remote control system software programming to complete the switch machine, color cycle, color change and other functions. The color conversion of the color lamp is realized by using the GPIO port of the chip to simulate the pulse wide band modulation function, so that the duty cycle of the red, green and blue LED lamp heads can be controlled by the main control. At the same time, the system adopts low power standby mode and can charge the power supply lithium battery through charger. The research and test results show that the designed capacitive touch keystroke has high response speed, accurate detection accuracy, strong anti-interference ability, and has certain water-proof and anti-noise ability. This research effectively improves and makes up for the shortcomings of the current capacitive touch keystroke technology, and makes the technology have greater application value and market prospect.
【学位授予单位】：武汉轻工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP334.3

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