键盘的分类 键盘分编码键盘和非编码键盘。键盘上闭合键的识别由专用的硬件编码器实现，并产生键编码号或键值的称为编码键盘-Classification keyboard keyboard keyboard sub-coding and non-coded keyboard. Keyboard button closure on the identification by a dedicated hardware encoder implementation, and generate enco

设计制作一套无线识别装置。该装置由阅读器、应答器和耦合线圈组成，其方框图见图1。阅读器能识别应答器的有无、编码和存储信息。阅读器应答器耦合线圈外接单电源-Design of a wireless identification device. The device consists of readers, transponders and coupling coils, which block diagram shown in Figure 1. Transponder reader can i