analogio – 模拟硬件支持

analogio 模块包含提供对模拟 IO 访问的类,这些类通常使用数模 (DAC) 和模数 (ADC) 转换器实现。

如果程序在使用后继续,所有类都会更改硬件状态,并且在不再需要它们时应取消初始化。为此,请调用deinit()或使用上下文管理器。有关更多信息,请参阅 Lifetime 和 ContextManagers

例如:

import analogio
from board import *

pin = analogio.AnalogIn(A0)
print(pin.value)
pin.deinit()

此示例将初始化设备、读取 value 然后 deinit() 是硬件。最后一步是可选的,因为 CircuitPython 会在程序完成后自动执行。

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class analogio.AnalogIn(pin: microcontroller.Pin)

读取模拟电压电平

用法:

import analogio
from board import *

adc = analogio.AnalogIn(A1)
val = adc.value

在给定的引脚上使用 AnalogIn。参考电压因平台而异,因此可reference_voltage 用于读取配置的设置。

参数

pin (Pin) – 要读取的 pin

value :int

模拟引脚上介于 0 和 65535(含)之间的值(16 位)。(只读) 即使底层模数转换器 (ADC) 的分辨率较低,该值也是 16 位。

reference_voltage :float

可测量的最大电压(也称为参考电压),单位为 float伏特。

deinit(self)None

关闭 AnalogIn 并释放引脚以供其他用途。

__enter__(self)AnalogIn

上下文管理器使用的无操作。

__exit__(self)None

退出上下文时自动取消初始化硬件。有关更多信息,请参阅 Lifetime 和 ContextManagers

class analogio.AnalogOut(pin: microcontroller.Pin)

输出模拟值(特定电压)。

用法示例:

import analogio
from board import *

dac = analogio.AnalogOut(A2)                # output on pin A2
dac.value = 32768                           # makes A2 1.65V

使用给定引脚上的 AnalogOut。

参数

pin (Pin) – 要输出到的引脚

value :int

模拟引脚上介于 0 和 65535(含)之间的值(16 位)。(只写)

即使底层数模转换器 (DAC) 的分辨率较低,该值为 16 位。

deinit(self)None

关闭 AnalogOut 并释放引脚以供其他用途。

__enter__(self)AnalogOut

上下文管理器使用的无操作。

__exit__(self)None

退出上下文时自动取消初始化硬件。有关更多信息,请参阅 Lifetime 和 ContextManagers