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例程讲解-01-main.py让LED亮起来！
本例程为01-Basics-main.py
# Main Module Example
#
# 当OpenMV摄像头从电脑断开时，它会运行SD卡上的main.py脚本(如果插了内存卡)或你的OpenMV摄像头内部Flash里的main.py脚本。
import time, pyb
#将蓝灯赋值给变量led
led = pyb.LED(3) # Red LED = 1, Green LED = 2, Blue LED = 3, IR LEDs = 4.
usb = pyb.USB_VCP() # This is a serial port object that allows you to
# communciate with your computer. While it is not open the code below runs.
#如果openmv未连接到电脑，蓝灯亮150ms，延时100ms，亮150ms，延时600ms，循环。
while(not usb.isconnected()):
led.on() #亮灯
time.sleep_ms(150) #延时150ms
led.off() #暗灯
time.sleep_ms(100)
led.on()
time.sleep_ms(150)
led.off()
time.sleep_ms(600)
#变量led此时代表绿灯
led = pyb.LED(2) # 切换到使用绿色led。
#如果openmv已连接到电脑
while(usb.isconnected()):
led.on()
time.sleep_ms(150)
led.off()
time.sleep_ms(100)
led.on()
time.sleep_ms(150)
led.off()
time.sleep_ms(600)
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