yd_rp2040_example1.py

from machine import Pin, Timer
from time import sleep
import time
from neopixel import Neopixel # neopixel lib = https://github.com/blaz-r/pi_pico_neopixel/blob/main/neopixel.py


LED_PIN = 25
USRBUTTON_PIN = 24
NEOPIXEL_PIN = 23

led = Pin(LED_PIN, Pin.OUT)
timer = Timer()

pixels = Neopixel(1, 0, NEOPIXEL_PIN, "RGB")

def blink(timer):
    led.toggle()
    
def wheel(pos):
    if pos<0 or pos>255:
        return (0,0,0)
    if pos<85:
        return (255-pos*3,pos*3,0)
    if pos<170:
        pos -= 85
        return (0, 255-pos*3,pos*3)
    pos -= 170
    return (pos*3,0,255-pos*3)

 
timer.init(freq=2.5, mode=Timer.PERIODIC, callback=blink)
button = Pin(USRBUTTON_PIN, Pin.IN, Pin.PULL_UP)
pixels.brightness(50)

j=0

while True: 
    pixels.set_pixel(0, wheel(j))
    pixels.show()
    j=(j+1)%256
    time.sleep(0.01)
    if not button.value():
        print ("Pressing")
        time.sleep(0.5)