说明：  采用PIC模拟串口发送遥控编码,共先发前一个字节做为同步码,再发第二字节做为地址码,第三字节为按键码,每按一次重复发送五次密码
(PIC simulation using serial port to send remote control codes, a total of before the onset of a byte as the first synchronization code, and then a second byte as the address code, the third byte of key, and each time I press five times to repeat sending password)