控制继电器和lcd 包含8个输入和6个输出以及4X5薄膜按键的输入检测 并用19264输出实现-Input detection and control relay lcd includes eight inputs and six outputs and 4X5 membrane keypad and output achieved with 19,264

4*4的薄膜按键，采用状态机实现译码功能和按键消抖功能(4 * 4 of the film button, using the state machine to achieve decoding and key function)

矩阵键盘作为按键，进行计算并显示到LCD，可以连续计算(The matrix keyboard is used as the key to calculate and display on LCD,Can be continuously calculated)