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介绍

The VEX IQ (2nd gen) Brain Sensing category offers methods for interacting with the Brain’s buttons and connected battery.

This page uses brain as the example Brain name. Replace it with your own configured name as needed.

以下是所有方法的列表：

Actions — Interact with the VEX IQ (2nd gen) Buttons.

• pressed — Registers a function to be called when the specified button is pressed.

• released — Registers a function to be called when the specified button is released.

Getters — Return data from the buttons and battery.

• pressing — Returns whether the specified button is being pressed.

• capacity — Returns the remaining battery capacity.

• voltage — Returns the voltage of the battery.

• current — Returns the current drawn by the battery.

Constructors — Manually initialize the Brain.

• brain — Create a brain.

行动

pressed

pressed registers a function to be called when a specific button on the Brain is pressed. This method must be called on a specific button object, such as buttonCheck — (see full list of button objects below).

用法：
三个可用按钮对象之一可与此方法一起使用，如下所示：

按钮	命令
buttonCheck	brain.buttonCheck.pressed(callback, arg) — The Check button
buttonLeft	brain.buttonLeft.pressed(callback, arg) — The Left button
buttonRight	brain.buttonRight.pressed(callback, arg) — The Right button

参数	描述
callback	先前定义的在按下指定按钮时执行的 函数。
arg	可选。包含要传递给回调函数的参数的元组。更多信息，请参阅带参数的函数](…/Logic/Functions.md#functions-with-parameters)。

# Turn in a circle when the left button
# is pressed
def button_pressed():
    drivetrain.turn_for(RIGHT, 360, DEGREES)

brain.buttonLeft.pressed(button_pressed)

released

released registers a function to be called when a specific button on the Brain is released. This method must be called on a specific button object, such as buttonCheck — (see full list of button objects below).

用法：
三个可用按钮对象之一可与此方法一起使用，如下所示：

按钮	命令
buttonCheck	brain.buttonCheck.released(callback, arg) — The Check button
buttonLeft	brain.buttonLeft.released(callback, arg) — The Left button
buttonRight	brain.buttonRight.released(callback, arg) — The Right button

参数	描述
callback	先前定义的在释放指定按钮时执行的 函数。
arg	可选。包含要传递给回调函数的参数的元组。更多信息，请参阅带参数的函数](…/Logic/Functions.md#functions-with-parameters)。

# Turn in a circle when the left button
# is released
def button_released():
    drivetrain.turn_for(LEFT, 360, DEGREES)

brain.buttonLeft.released(button_released)

吸气剂

pressing

pressing returns a Boolean indicating whether a specific button on the Brain is currently being pressed. This method must be called on a specific button object, such as buttonCheck (see full list of button objects below).

• True — The specified button is being pressed.

• False — The specified button is not being pressed.

用法：
三个可用按钮对象之一可与此方法一起使用，如下所示：

按钮	命令
buttonCheck	brain.buttonCheck.pressing() — The Check button
buttonLeft	brain.buttonLeft.pressing() — The Left button
buttonRight	brain.buttonRight.pressing() — The Right button

参数	描述
	该方法没有参数。

# Turn when the check button is pressed
while True:
    if brain.buttonCheck.pressing():
        drivetrain.turn(RIGHT)
    else:
        drivetrain.stop()

capacity

capacity returns the remaining capacity of the battery as a percentage.

Usage:
brain.battery.capacity()

参数	描述
	该方法没有参数。

# Display the current battery capacity
brain.screen.print(brain.battery.capacity())

voltage

voltage returns the voltage of the battery as a float.

Usage:
brain.battery.voltage(units)

参数	描述
units	Optional. The unit that represents the voltage: MV (default) — Millivolts VOLT

# Display the current voltage of the battery
brain.screen.print(brain.battery.voltage())

current

current returns the current drawn from the battery in milliamps as a float.

Usage:
brain.battery.current()

参数	描述
	该方法没有参数。

# Display the current of the battery
brain.screen.print(brain.battery.current())

构造函数

Brain

Brain creates an object of the brain class.

Usage:
brain = Brain()

参数	描述
	该方法没有参数。

brain = Brain()

# Turn when the check button is pressed
while True:
    if brain.buttonCheck.pressing():
        drivetrain.turn(RIGHT)
    else:
        drivetrain.stop()