引领#

初始化 Led 类 #

使用以下构造函数创建 LED：

Led(port)

此构造函数使用一个参数：

范围	描述
`port`	The 3-Wire Port that the LED is connected to, whether it’s a port on the `Brain`, or a `3-Wire Expander`.

A Brain or 3-Wire Expander must be created first before they can be used to create an object with the LED Class constructor.

# Create the Brain.
brain = Brain()
# Construct an LED "led" with the Led class.
led = Led(brain.three_wire_port.a)

This led object will be used in all subsequent examples throughout this API documentation when referring to Led class methods.

The on() method turns the LED on.

**返回：**无

# Turn on the LED.
led1.on()

# Wait 2 seconds.
wait(2, SECONDS)

# Turn off LED.
led1.off()

The off() method turns the LED off.

**返回：**无

# Turn on the LED.
led1.on()

# Wait 2 seconds.
wait(2, SECONDS)

# Turn off LED.
led1.off()