蜂鸣器是一种一体化结构的电子讯响器，本文介绍如何用单片机驱动蜂鸣器，他广泛应用于计算机、打印机、复印机、报警器、电话机等电子产品中作发声器件。-Buzzer electronic Xiangqi an integrated structure, this article describes how to use the microcontroller drive the buzzer, he is widely used in computers, printers, copiers, alar