脉宽调制#

初始化 Pwm 类 #

使用以下构造函数创建 Pwm 输出：

Pwm(port)

此构造函数使用一个参数：

范围	描述
`port`	The 3-Wire Port to use for the Pwm Output, 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 Pwm Class constructor.

# Create the Brain.
brain = Brain()
# Construct a Pwm Output "pwm" with the Pwm class.
pwm = Pwm(brain.three_wire_port.a)

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

The state(value, units) method sets the state of the PWM.

参数	描述
`value`	为 PWM 输出设置的新值，从 -100% 到 +100%。
`units`	Optional. The only valid unit for pwm output is `PERCENT`.

**返回：**无。

# Set PWM output to 50%.
pwm.state(50)