The Pi Hut LED Christmas Tree serene mode

xmastree.py

from gpiozero import LEDBoard
from signal import pause
from time import sleep

steps=30
brightness = 0.1/steps
delay=0.01
leds = LEDBoard(*range(2,28),pwm=True)

while True:
  for x in range(1, 26):
    for y in range(steps):
      leds[x].value = y*brightness
      leds[0].value = (x+(y*brightness)-1)*0.02*brightness*steps
      sleep(delay)
  for x in range(1, 26):
    for y in reversed(range(steps)):
      leds[x].value = y*brightness
      leds[0].value = (25-(x-(y*brightness)))*0.02*brightness*steps
      sleep(delay)