I'm trying to code a button to turn and LED on and off.

from machine import Pin

led = Pin(16, Pin.OUT)
button = Pin(17, Pin.IN)

while True:
    if button.value()==1:
    if button.value()==0:

This is all running on a Pi Pico W. I notice the LED turns on anytime a wire is connected to pin 17, even if the wire isn't plugged into anything else. When I push the button it lights up brighter, and prints Hello.

Any help would be greatly appreciated, thanks!

  • why do you believe that the problem is caused by the code? ... please add all of the available information to your question
    – jsotola
    Commented Apr 14, 2023 at 17:34
  • Post a photo of your wiring. I assume your button is connected to 3.3V, you should pull down your input. projects.raspberrypi.org/en/projects/…
    – CoderMike
    Commented Apr 14, 2023 at 19:11

1 Answer 1


It may be a case of floating pin. Try inserting a (for example) 10k resistor between the pin and GND. How do pull-down resistors work?

  • Or just configure pull down on the pin.
    – CoderMike
    Commented Apr 14, 2023 at 21:09

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