电位器V2#

初始化 PotentiometerV2 类#

使用以下构造函数创建 PotentiometerV2：

PotentiometerV2(port)

此构造函数使用一个参数：

范围

描述

port

The 3-Wire Port that the PotentiometerV2 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 PotentiometerV2 Class constructor.

# Create the Brain.
brain = Brain()
# Construct a PotentiometerV2 "pot2" with the PotentiometerV2 class.
pot2 = PotentiometerV2(brain.three_wire_port.a)

This pot2 object will be used in all subsequent examples throughout this API documentation when referring to PotentiometerV2 class methods.

类方法#

angle()#

The angle(units) method returns the angle measured by the PotentiometerV2.

参数

描述

units

Optional. A valid RotationUnits type or PERCENT. The default is DEGREES.

**返回：**电位器V2测量的角度。

# Print the current angle of the PotentiometerV2 to the Brain's screen.
brain.screen.print(pot2.angle())

changed()#

The changed(callback, arg) method registers a callback function for when the value measured by the PotentiometerV2 changes.

参数

描述

callback

当电位器测量的值发生变化时调用的回调函数。

arg

**可选。**传递给回调函数的参数元组。

**返回：**无。

# Define a function potentiometerV2_changed()
def potentiometerV2_changed():
    # The Brain will print that the potentiometer value changed
    #  on the Brain's screen.
    brain.screen.print("potentiometer value changed")

# Run PotentiometerV2_changed when the value measured by 
# the Potentiometer changes.
pot2.changed(potentiometerV2_changed)
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