MT8880是DTMF信号的解码芯片，在智能电话控制中使用很多，这个里面有单独的拨号与振铃检测摘机的程序，每个程序都有详细的注释，非常好用-MT8880 is a DTMF signal decoder chip in the smart phone to use a lot of control, the inside has a separate dial-up hook and ring detection process, each program had detailed notes

无线钓鱼船，无线遥控放线功能，自动检测鱼上钩功能，自动收线功能。-Wireless fishing boat, wireless remote control pay-off function, auto-detection function of the fish hook, auto-close connections.

来电检测 入口：无 出口：ringF=1（确认是合法的来电标志） 影响： 调用：延时函数 */ DATA Byte Ringwait //来铃次数摘机-Detection of entry calls: No exit: ringF = 1 (call sign recognition is legal) implications: call: Delay function*/DATA Byte Ringwait // to the number of hook

电话检测模块原理图PDF和schdoc文件。检测振铃，检测摘机和挂机。-Phone detection module the schematic PDF and schdoc-file. Ring detection, detection of the hook and hang up.

实验目的:结合DTMF拨号实验,按键检测实验和继电器实验,拨打电话.电话号码从键盘输入,挂机和摘机也从键盘上完成. F键是摘机,E键是挂机-Objective: combined with DTMF experiment, button detection experiments and relay experiment, call. Telephone number the keyboard input, on hook and off hook the keyboard to comp