29 917
modifications
Modifications
Sauter à la navigation
Sauter à la recherche
Ligne 33 :
Ligne 33 : + + + + + + + + + + + + + + + +
→Input Reading
To avoids that issue, the best is to use a pull-up resistor. Many microcontroler have internal pull-up resistor (it just needs to be activated).
To avoids that issue, the best is to use a pull-up resistor. Many microcontroler have internal pull-up resistor (it just needs to be activated).
== Input Reading with Pull-Up ==
The pico can activates a Pull-up resistor on any of its input pins.
When the Pin is tied to ground then the input is Low (0) otherwise, the pull-up resistor will drive back the pin voltage to 3.3V.
The following code will read the state of the GP15 configured as input pin + pull-up.
<syntaxhighlight lang="python">
>>> from machine import Pin
>>> p = Pin( 15, Pin.IN, PIN.PULLUP )
>>> p.value()
0 <--- Pin tied to GND
>>> p.value()
1 <--- Pin tied to 3.3V or floating.
</syntaxhighlight>
== Analog Reading ==
== Analog Reading ==