rpi pico circuitpython demo

code.py

import board
import digitalio
import time

led = digitalio.DigitalInOut(board.GP25)
led.direction = digitalio.Direction.OUTPUT

def blink(count=1, delay=0.5):
    for cv in range(count):
        led.value = True
        time.sleep(delay)
        led.value = False
        time.sleep(delay)
        
diff = 1
cv = 1

while True:
    blink(2, 1/cv)
    cv = cv + diff
    if (cv == 1 and diff == -1) or ( cv == 60 and diff == 1):
        diff = diff * -1