this a digital intercom projects using ADC PWM and UART interrupt. you take the value from mic enter it to ADC and then send serially to the other microcontroller which receives the data and transform the digital data into analog data by PWM which

LCM二级菜单的程序编写,这是一个项目实例，对菜单编写有很好的借鉴作用。希望对单片机开发项目做人机界面的有帮助。-LCM secondary menu programming, this is an instance of a project, the menu written a very good reference. Microcontroller development projects HCI.

个人收集的100多个单片机小项目制作源码，很不错的源码，发出来供大家学习参考-Personal collection of more than 100 small projects making microcontroller source code, a very good source, and sent for them to learn