利用外部中断接受红外信号，定时器计时，红外信号高低电平时间不同，因而可以根据时间把信号分离出来，然后再六位数码管上显示出红外的信号-IR signals received by external interrupt, the timer, infrared signal high and low at different times, so the signal can be separated by time, and then six digital signals to display t