/超声波测距系统,2008.5.5// 89s51,数显，99CM-5CM,声光报警,继电器欠压保护,继电器5CM继电器控制电机断电 工作电压12v输入,3路数码管显示距离 -/ Ultrasonic ranging system, 2008.5.5// 89s51, digital display, 99CM-5CM, sound and light alarm, undervoltage protection relay, relay 5CM relay control volt

基于NUC501MCU的微型热敏打印机的组成，详细分析了其工作原理，给出了热敏头过热保护以及步进电机驱动模块的设计与实现方式。-Based on the composition NUC501MCU miniature thermal printer, a detailed analysis of its working principle, the design and implementation of the thermal head temperature protection and s