对称式双电位扩展键盘设计

Design of Double Potential Symmetrical Extended Keyboard

本设计是基于MCU的一款高效率键盘输入系统。通过对分立按键和普通二极管的合理布局，实现了一种利用N个双向I/O端口确定N2＋N个键值的键盘电路设计。实验证明，该键盘电路结构简单、抗干扰能力强、稳定性好，具有很高的使用价值。

Based on the MCU,a high-effifiency keyboard input system is designed in this paper. Through the rational distribu-tion of discrete buttons and ordinary diodes, implements a use of N bidirectional I/O port identified N 2＋N key keyboard circuit design. Experiments show that the keyboard circuit structure has the simple control circuit,good anti-jamming ability,good stabil-ity and high practical value.