from pyb import LED,Pin

pin0 = Pin('P0', Pin.IN, Pin.PULL_UP)#设置pin0是输入模式，电压拉高
pin1 = Pin('P1', Pin.OUT_PP, Pin.PULL_UP)
pin2 = Pin('P2', Pin.OUT_PP, Pin.PULL_UP)

RedLed = LED(1)

while(True):
    pin0Value = pin0.value()#读取pin0的数值
    if(pin0Value == 0):#如果发现pin0的电压被拉低了，就将pin1，pin2的电压设置成高电平，并且红灯亮
        pin1.value(1)
        pin2.value(1)
        RedLed.on()
    else:
        pin1.value(0)
        pin2.value(0)
        RedLed.off()