Using GPIO

External LED or pin on/off

import machine, time

# Using GP28
led = machine.Pin(28, machine.Pin.OUT) 
while True:
    print("blink!")
    led.on()
    time.sleep(0.2)
    led.off()
    time.sleep(0.2)

To use the on-board LED of the Pico W,

led = machine.Pin("LED", machine.Pin.OUT)

Detect button press

import machine, time

led = machine.Pin(28, machine.Pin.OUT)
# Using GP27 and 3.3V for button
button = machine.Pin(27, machine.Pin.IN, machine.Pin.PULL_DOWN)
print("Waiting...")
while True:
    if button.value():
        print("Button pressed")
        led.on()
        time.sleep(1)
        led.off()
    time.sleep(0.2)

• Note: If you are connecting the button between a GPxx pin and ground, you will need to invert your button.value() check… ie if not button.value(): and set the pin built-in resistor to machine.Pin.PULL_UP.

import machine, time

led = machine.Pin("LED", machine.Pin.OUT)
# Using GP27 and GND for button
button = machine.Pin(27, machine.Pin.IN, machine.Pin.PULL_UP)
print("Waiting...")
while True:
    if not button.value():
        print("Button pressed")
        led.on()
        time.sleep(1)
        led.off()
    time.sleep(0.2)

9g servo

Download the Servo library file and save it to your board as servo.py.

import time
from machine import Pin,PWM
from servo import Servo

sg90_servo = Servo(pin=0) # Update for correct GPxx pin number
button = machine.Pin(2, machine.Pin.IN, Pin.PULL_UP) # Pin 2 and GND
while True:
    if not button.value():   # If button pressed
        print("Button press detected")
        # Servo operation
        sg90_servo.move(35)  # turns the servo to 0°.
        time.sleep(0.9)
        sg90_servo.move(90)  # turns the servo to 90°.
        time.sleep(1)
    time.sleep(0.2)