This paper presents a novel design method for keyboard circuits. The purpose of this study is to enable a single-board computer with fewer pins to recognize a keyboard system consisting of a large number of switches. Through the study of different kinds of keyboard circuits, a general circuit schematic design method is abstracted. Several experiments are conducted to prove the feasibility of the proposed circuit design method.,Conventional circuit schematic diagrams are often limited to two-dimensional planes. Through investigating higher dimensional alternatives, this paper proposes to place components in high-dimensional geometry before connecting all components. A multi-pin switch construction method is proposed to allow the switches to be arranged on the vertices of high-dimensional geometry and be connected sequentially to form the keyboard system. This proposed system can allow a keyboard system consisting of a large number of switches to be recognized by a single-board computer with less available pins.,The design scheme proposed in this paper can read more switch states with limited Input/Output pins. With the increase of the number of Input/Output ports and pins, the number of simultaneously identifiable switches increases exponentially, which is suitable for sensor design of array type.,Compared with the classical keyboard circuits, the circuit designed using the proposed method will lead to a slightly longer recognition time for each key. This can be compensated by a single-board computer with a modestly higher clock speed.,The circuit schematic design method based on high-dimensional geometry is introduced for the first time. The feasibility of the proposed method is verified by the original experiments. The proposed approach is of importance in guiding the design of new analog and digital sensor circuit systems.

中文翻译：

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一种多维矩阵键盘接口电路设计

本文提出了一种新的键盘电路设计方法。本研究的目的是使具有较少引脚的单板计算机能够识别由大量开关组成的键盘系统。通过对各种键盘电路的研究，抽象出一种通用的电路原理图设计方法。进行了多次实验以证明所提出的电路设计方法的可行性。传统的电路原理图通常仅限于二维平面。通过研究更高维的替代方案，本文建议在连接所有组件之前将组件放置在高维几何中。提出了一种多针开关构造方法，允许开关排列在高维几何的顶点上，并依次连接形成键盘系统。该系统可以使由大量开关组成的键盘系统能够被可用引脚较少的单板计算机识别。本文提出的设计方案可以在输入/输出引脚有限的情况下读取更多的开关状态。随着输入/输出端口和引脚数量的增加,同时可识别的开关数量呈指数增长,适用于阵列式传感器设计。,与经典键盘电路相比,采用该方法设计的电路将领先每个键的识别时间稍长。这可以通过时钟速度稍高的单板计算机来补偿。,首次引入了基于高维几何的电路原理图设计方法。通过原始实验验证了所提出方法的可行性。所提出的方法对于指导新的模拟和数字传感器电路系统的设计很重要。