光传感器#

介绍#

光传感器测量物体反射或照射到物体上的光的亮度。它输出一个模拟值，表示检测到的光量。

VEX EXP 光传感器。

This page uses light_sensor as the example Light Sensor name. Replace it with your own configured name as needed.

以下是可用方法列表：

  • brightness – Returns the amount of light detected by the Light Sensor.

  • changed – Registers a function to be called whenever the Light Sensor’s brightness value changes.

构造函数 - 手动初始化光传感器。

  • Light – Create a Light Sensor.

亮度#

brightness returns the amount of light detected by the Light Sensor as an integer.

Usage:
light_sensor.brightness(units)

范围

描述

units

Optional. The unit to return the brightness with: PERCENT (default).

已更改#

changed registers a function to be called whenever the Light Sensor’s brightness value changes.

Usage:
light_sensor.changed(callback, arg)

参数

描述

callback

先前定义的 函数，当光传感器的亮度值发生变化时执行。

arg

Optional. A tuple containing arguments to pass to the callback function. See Functions with Parameters for more information.

 
def my_function():
  brain.screen.print("Brightness changed")

# Call my_function whenever the brightness changes
light_sensor.changed(my_function)

构造器#

Constructors are used to manually create Light objects, which are necessary for configuring a Light Sensor outside of VEXcode.

Light#

Light creates a Light Sensor.

Usage:
Light(port)

范围

描述

port

The 3-Wire Port that the Light Sensor is connected to:

  • On the EXP Brain – brain.three_wire_port.x where x is the number of the port.
  • On a 3-Wire Expander – expander.a where expander is the name of the expander instance.

 
# Create a Light Sensor in Port A
light_sensor = Light(brain.three_wire_port.a)
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