上位机系统与单片机下位机的在线通信控制程序，内有源码以及原理图-Single-chip host computer system and the lower machine online communication control

凌阳的61单片机 制作的公交车报站器，含有原理图 操作源代码和制作说明，配套资料-Sunplus chip made of 61 bus-stop device, containing the source code and schematic operation of production instructions, supporting information.

基于单片机的简易频率计，可测量1HZ—10KHZ的频率，精准率为1 ，可显示占空比。可测量方波，三角波，正昡波.里面包含原理图和源程序，非常实用，大家可以参考参考-Simple microcontroller-based frequency meter measurable frequency 1HZ-10KHZ, the precise rate of 1 , the duty cycle can be displayed. Measurable square, triangle, posit