You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
1018 B
36 lines
1018 B
5 years ago
|
.. currentmodule:: machine
|
||
|
|
.. _machine.ADC:
|
||
|
|
|
||
|
|
class ADC -- analog to digital conversion
|
||
|
|
=========================================
|
||
|
|
|
||
|
|
The ADC class provides an interface to analog-to-digital convertors, and
|
||
|
|
represents a single endpoint that can sample a continuous voltage and
|
||
|
|
convert it to a discretised value.
|
||
|
|
|
||
|
|
Example usage::
|
||
|
|
|
||
|
|
import machine
|
||
|
|
|
||
|
|
adc = machine.ADC(pin) # create an ADC object acting on a pin
|
||
|
|
val = adc.read_u16() # read a raw analog value in the range 0-65535
|
||
|
|
|
||
|
|
Constructors
|
||
|
|
------------
|
||
|
|
|
||
|
|
.. class:: ADC(id)
|
||
|
|
|
||
|
|
Access the ADC associated with a source identified by *id*. This
|
||
|
|
*id* may be an integer (usually specifying a channel number), a
|
||
|
|
:ref:`Pin <machine.Pin>` object, or other value supported by the
|
||
|
|
underlying machine.
|
||
|
|
|
||
|
|
Methods
|
||
|
|
-------
|
||
|
|
|
||
|
|
.. method:: ADC.read_u16()
|
||
|
|
|
||
|
|
Take an analog reading and return an integer in the range 0-65535.
|
||
|
|
The return value represents the raw reading taken by the ADC, scaled
|
||
|
|
such that the minimum value is 0 and the maximum value is 65535.
|