眼睛

介绍

VR眼部传感器可以检测物体并识别其颜色、亮度和色调。它还允许您调整检测范围和照明设置，以获得更准确的读数。

以下是所有可用方法的列表：

Getters – Read object presence, color, brightness, and hue.

• near_object – Returns whether the Eye Sensor detects an object within range.

• detect – Returns whether the Eye Sensor detects a specific color.

• brightness – Returns the amount of light reflected from the object as a percent.

回调函数——当检测到物体或物体丢失时运行的代码。

• object_detected – Registers a function to be called whenever the Eye Sensor detects an object.

• object_lost – Registers a function to be called whenever the Eye Sensor loses an object.

获取器

near_object

near_object returns a Boolean that reports whether or not the Eye Sensor detects an object within range.

• True – The sensor is near an object.

• False – The sensor is not near an object.

Usage:
eye.near_object()

参数	描述
	此方法没有参数。

def main():
    # Stop driving when Eye Sensor is 
    # near an object
    drivetrain.drive(FORWARD)
    while True:
        if front_eye.near_object():
            drivetrain.stop()
        wait(5, MSEC)

# VR threads — Do not delete
vr_thread(main)

detect

detect returns a Boolean that reports whether the Eye Sensor detects a specified color, based on the detected hue value.

• True — The Eye Sensor detects the selected color.

• False — The Eye Sensor does not detect the selected color.

Usage:
eye.detect(color)

参数	描述
color	The color for the Eye Sensor to check for: BLUE GREEN NONE RED

def main():
    # Stop the robot if the Eye Sensor 
    # detects red
    drivetrain.turn(RIGHT)
    while True:
        if front_eye.detect(RED):
            drivetrain.stop()
        wait(5, MSEC)

# VR threads — Do not delete
vr_thread(main)

brightness

brightness returns the amount of light reflected from the object as a decimal (float) representing a percent.

A higher percentage means more light is reflected back to the Eye Sensor. A lower percentage means less light is reflected back.

Usage:
eye.brightness(units)

参数	描述
units	The unit that represents the brightness: PERCENT

打回来

object_detected

object_detected registers a function to be called whenever the Eye Sensor detects a new object.

Usage:
eye.object_detected(callback)

参数	描述
callback	A previously defined function that executes when the Eye Sensor detects a new object.

def detected():
    # Display a message
    drivetrain.stop()
    brain.print("object detected")
    wait(0.5,SECONDS)
    brain.clear()

def main():
    # Drive until an object is detected
    drivetrain.drive(FORWARD)
    front_eye.object_detected(detected)

# VR threads — Do not delete
vr_thread(main)

object_lost

object_lost registers a function to be called whenever the Eye Sensor loses a detected object.

Usage:
eye.object_lost(callback)

参数	描述
callback	A previously defined function that executes when the Eye Sensor loses a detected object.

def lost():
    # Display a message
    drivetrain.stop()
    brain.print("object lost")
    wait(0.5,SECONDS)
    brain.clear()

def main():
    # Back away from an object
    drivetrain.drive(REVERSE)
    front_eye.object_lost(lost)

# VR threads — Do not delete
vr_thread(main)