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→Analog Reading
== Analog Reading ==
== Analog Reading ==
The onboard LED is tied to the GPIO 25. Here how to control it.
Lets read some voltage from the ADC1 (attached to GPIO 27).
The value is read on the ADC via the common {{fname|read_u16()}} method.
That method returns a 16 bits value, so a number between 0 and 65535.
{{ambox|text=Even if the {{fname|read_u16()}} returns a 16 bits values, the effective ADC resolution is still 12 bits. The MicroPython internal will just upscale the ADC value from 0..4095 to returned value 0..65535 by applying a multiplier.}}
<syntaxhighlight lang="python">
<syntaxhighlight lang="python">
from machine import Pin
from machine import Pin, ADC
p = Pin( 27 )
analog = ADC( p )
value = analog.read_u16()
print( 'value: %i' % value )
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