数码管驱动芯片CH423与CH422通用，经测试OK，很方便的数码管驱动，不需要扩展芯片，2线通讯。-LED driver chip CH423 and CH422 Universal, tested OK, very convenient digital tube driver, no expansion of the chip, two-line communication.

CH423数码管动态扫描51单片机程序。-CH423 digital tube dynamic scanning 51 MCU program