1.单片机上电后，用程序点亮信号灯A（非单片机开发板上自带的电源灯）；(5分)

2.使灯A闪烁，周期为1S（0.5S亮0.5S灭）；(10分)

3.设置按键，使可通过按键设置灯的闪烁周期（T为0.5S~3S可调，可调精度为0.1S，亮与灭的时间均为0.5T）；(25分)

4.编写程序，使灯B通过PWM波控制，成为呼吸灯（周期T为2.5S，占空比为0 ~100 ）；(20分)

5.编写程序，使通过按键可设置呼吸灯周期（周期T为1S~4S可调，可调精度为0.1S）；(20分)

6.*附加要求：通过数码管或液晶实现人机交互，即在通过按键设置灯周期时，在其上面显示当前设置的周期时间；-1. After the microcontroller power utility lights lit A (non-microcontroller development board comes with power light)　(5 points) 2. A flashing lamp, period 1S (0.5S 0.5S light off)　( 10.) 3. Set button, so by pressing a button set lights flashing cycle (T is 0.5S ~ 3S adjustable, adjustable precision is 0.1S, bright and off times are 0.5T)　(25 points) 4 Write a program, the lamp B by a PWM wave control, becomes respiration lamp (period T is 2.5S, the duty cycle is 0　to 100 )　(20 points) 5. Write a program that can be set through the key breathing light cycle (period T 1S ~ 4S adjustable, adjustable precision is 0.1S)　(20 points) 6.* Additional requirements: through digital tube or LCD human-computer interaction, that is, when the key is set by light cycle thereon It displays the current settings of the cycle time