this a PIC code + simulation file that demonstrate how to use charlieplexing to drive many seven segment display digits using a single PORT in PIC microcontroller.user need "Mkrobasic" to open source code and "Proteus" to open simulation-this is a PI

这是一个在七段数码管上显示时，分，秒的vhdl 完整程序，希望对大家有用。-This is a seven-segment digital tube display hours, minutes, and seconds vhdl complete program, I hope useful.

本文介绍的八路数显无线遥控抢答器，它由8个发射器和1个接收器组成，可用于8组或8组以下的智力竞赛中。本设计使用到的元器件包括：8051芯片、数码LED显示器、七段LED数码管的译码。-This article describes the significant number eight wireless remote Responder, which consists of eight transmitter and a receiver components can be used for e