ADCWiPy 类 – 模数转换

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ADCWiPy 类 – 模数转换

笔记

此类是 WiPy 的非标准 ADC 实现。它可以像 machine.ADC在 WiPy 上一样简单地使用，但在下面的文档中命名，machine.ADCWiPy以将其与更通用的 machine.ADC类区分开来。

用法：

1. import machine
   
2. 
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3. adc = machine.ADC()             # create an ADC object
   2 `( ]9 J* {- @- R
4. apin = adc.channel(pin='GP3')   # create an analog pin on GP3
   
5. val = apin()                    # read an analog value

复制代码

3 q) J" t1 _/ J1 e( ^# W8 K构造函数classmachine.ADCWiPy(id=0, *, bits=12)

创建与给定引脚关联的 ADC 对象。这允许您随后读取该引脚上的模拟值。有关更多信息，请查看 引脚排列和备用功能表。

警告

ADC 引脚输入范围为 0-1.4V（1.8V 是它可以承受的绝对最大值）。当 GP2、GP3、GP4 或 GP5 重新映射到 ADC 模块时，1.8 V 是最大值。如果这些引脚用于数字模式，则允许的最大输入电压为 3.6V。

方法ADCWiPy.channel(id, *, pin)

创建一个模拟引脚。如果仅给出通道 ID，则将选择正确的引脚。或者，只能通过引脚并选择正确的通道。例子：

1. # all of these are equivalent and enable ADC channel 1 on GP3
   
2. apin = adc.channel(1)
   
3. apin = adc.channel(pin='GP3')
   
4. apin = adc.channel(id=1, pin='GP3')

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8 C% P( z& X# I8 F8 O
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; n  {: l( A, o  s3 A8 cADCWiPy.init()

启用 ADC 模块。

ADCWiPy.deinit()

禁用 ADC 模块。

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1 V$ T  `2 l4 Q7 X: d类 ADCChannel — 从内部或外部源读取模拟值

ADC 通道可以连接到 MCU 的内部点或 GPIO 引脚。ADC 通道是使用 ADC.channel 方法创建的。

machine.adcchannel()

读取通道值的快速方法。

adcchannel.value()

读取通道值。

adcchannel.init()

重新初始化（并有效启用）ADC 通道。

adcchannel.deinit()

禁用 ADC 通道。

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