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.
20 lines
600 B
20 lines
600 B
9 years ago
|
Analog to Digital Conversion
|
||
|
|
============================
|
||
|
|
|
||
|
|
The ESP8266 has a single pin (separate to the GPIO pins) which can be used to
|
||
|
|
read analog voltages and convert them to a digital value. You can construct
|
||
|
|
such an ADC pin object using::
|
||
|
|
|
||
|
|
>>> import machine
|
||
|
|
>>> adc = machine.ADC(0)
|
||
|
|
|
||
|
|
Then read its value with::
|
||
|
|
|
||
|
|
>>> adc.read()
|
||
|
|
58
|
||
|
|
|
||
|
|
The values returned from the ``read()`` function are between 0 (for 0.0 volts)
|
||
|
|
and 1024 (for 1.0 volts). Please note that this input can only tolerate a
|
||
|
|
maximum of 1.0 volts and you must use a voltage divider circuit to measure
|
||
|
|
larger voltages.
|