pimoroni-pico/micropython/examples/plasma_stick/cheerlights.py

import WIFI_CONFIG
from network_manager import NetworkManager
import uasyncio
import urequests
import time
import plasma
from plasma import plasma_stick
from machine import Pin

'''
This Plasma Stick example sets your LED strip to the current #cheerlights colour.
Find out more about the Cheerlights API at https://cheerlights.com/
'''

URL = 'http://api.thingspeak.com/channels/1417/field/2/last.json'
UPDATE_INTERVAL = 120  # refresh interval in secs. Be nice to free APIs!

# Set how many LEDs you have
NUM_LEDS = 50


def status_handler(mode, status, ip):
    # reports wifi connection status
    print(mode, status, ip)
    print('Connecting to wifi...')
    # flash while connecting
    for i in range(NUM_LEDS):
        led_strip.set_rgb(i, 255, 255, 255)
        time.sleep(0.02)
    for i in range(NUM_LEDS):
        led_strip.set_rgb(i, 0, 0, 0)
    if status is not None:
        if status:
            print('Wifi connection successful!')
        else:
            print('Wifi connection failed!')
            # if no wifi connection, you get spooky rainbows. Bwahahaha!
            spooky_rainbows()


def spooky_rainbows():
    print('SPOOKY RAINBOWS!')
    HUE_START = 30  # orange
    HUE_END = 140  # green
    SPEED = 0.3  # bigger = faster (harder, stronger)

    distance = 0.0
    direction = SPEED
    while True:
        for i in range(NUM_LEDS):
            # generate a triangle wave that moves up and down the LEDs
            j = max(0, 1 - abs(distance - i) / (NUM_LEDS / 3))
            hue = HUE_START + j * (HUE_END - HUE_START)

            led_strip.set_hsv(i, hue / 360, 1.0, 0.8)

        # reverse direction at the end of colour segment to avoid an abrupt change
        distance += direction
        if distance > NUM_LEDS:
            direction = - SPEED
        if distance < 0:
            direction = SPEED

        time.sleep(0.01)


def hex_to_rgb(hex):
    # converts a hex colour code into RGB
    h = hex.lstrip('#')
    r, g, b = (int(h[i:i + 2], 16) for i in (0, 2, 4))
    return r, g, b


# set up the Pico W's onboard LED
pico_led = Pin('LED', Pin.OUT)

# set up the WS2812 / NeoPixel™ LEDs
led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma_stick.DAT, color_order=plasma.COLOR_ORDER_RGB)

# start updating the LED strip
led_strip.start()

# set up wifi
try:
    network_manager = NetworkManager(WIFI_CONFIG.COUNTRY, status_handler=status_handler)
    uasyncio.get_event_loop().run_until_complete(network_manager.client(WIFI_CONFIG.SSID, WIFI_CONFIG.PSK))
except Exception as e:
    print(f'Wifi connection failed! {e}')
    # if no wifi, then you get...
    spooky_rainbows()

while True:
    # open the json file
    print(f'Requesting URL: {URL}')
    r = urequests.get(URL)
    # open the json data
    j = r.json()
    print('Data obtained!')
    r.close()

    # flash the onboard LED after getting data
    pico_led.value(True)
    time.sleep(0.2)
    pico_led.value(False)

    # extract hex colour from the data
    hex = j['field2']

    # and convert it to RGB
    r, g, b = hex_to_rgb(hex)

    # light up the LEDs
    for i in range(NUM_LEDS):
        led_strip.set_rgb(i, r, g, b)
    print(f'LEDs set to {hex}')

    # sleep
    print(f'Sleeping for {UPDATE_INTERVAL} seconds.')
    time.sleep(UPDATE_INTERVAL)