红外感应开关，stc12c2052ad芯片，电路图在无线电上有，叫精选单片机30例，很好玩，杜洋的程序-Infrared induction switch, STC12C2052AD chip, the circuit diagram on the radio, called the selection of SCM 30 cases, it is fun, Du Yang program

杜洋单片机源程序，实现1602液晶屏打字机功能(Du Yang MCU source program, the realization of 1602 LCD screen typewriter function)