# NeoPixels Rainbow on MicroPython
# Wokwi Example https://wokwi.com/arduino/projects/305569065545499202

from machine import Pin
from neopixel import NeoPixel
from time import sleep
import machine

def callback(p):
    print('pin change', p)
    #servo.set_angle(90)
    #machine.enable_irq()

rainbow = [
  (126 , 1 , 0),(114 , 13 , 0),(102 , 25 , 0),(90 , 37 , 0),(78 , 49 , 0),(66 , 61 , 0),(54 , 73 , 0),(42 , 85 , 0),
  (30 , 97 , 0),(18 , 109 , 0),(6 , 121 , 0),(0 , 122 , 5),(0 , 110 , 17),(0 , 98 , 29),(0 , 86 , 41),(0 , 74 , 53),
  (0 , 62 , 65),(0 , 50 , 77),(0 , 38 , 89),(0 , 26 , 101),(0 , 14 , 113),(0 , 2 , 125),(9 , 0 , 118),(21 , 0 , 106),
  (33 , 0 , 94),(45 , 0 , 82),(57 , 0 , 70),(69 , 0 , 58),(81 , 0 , 46),(93 , 0 , 34),(105 , 0 , 22),(117 , 0 , 10)]

off = (0,0,0)

pixels = NeoPixel(Pin(15), 8)
button = Pin(2,Pin.IN,Pin.PULL_UP)
# button.irq(trigger=Pin.IRQ_RISING, handler=callback)

while True:
    if not button.value() == False:
        
        for i in range(8):
            
            pixels[i] = rainbow[i]
            pixels[i - 1] = rainbow[i]
            
            pixels.write()
            sleep(0.05)
            pixels[i] = off
            pixels[i - 1] = off
            pixels.write()

    sleep(0.001)
            




main.py

diagram.json

from machine import Pin
from neopixel import NeoPixel
from time import sleep

RED = (127, 0, 0)
OFF = (0, 0, 0)
NUM_BARS = 4
PIXELS_PER_BAR = 8
TOTAL_PIXELS = NUM_BARS * PIXELS_PER_BAR

pixels = NeoPixel(Pin(15), TOTAL_PIXELS)

def set_bar_pixel(bar, pixel, color):
    if bar % 2 == 0:  # For even bars, pixels run top-down
        index = bar * PIXELS_PER_BAR + pixel
    else:  # For odd bars, pixels run bottom-up
        index = (bar + 1) * PIXELS_PER_BAR - pixel - 1
    pixels[index] = color

while True:
    for i in range(PIXELS_PER_BAR):  # For each pixel in a bar
        for bar in range(NUM_BARS):  # For each bar
            set_bar_pixel(bar, i, RED)
        pixels.write()
        sleep(0.1)

        # Turn off the pixels for the next round
        for bar in range(NUM_BARS):
            set_bar_pixel(bar, i, OFF)
        pixels.write()


MoveDown.py

from machine import Pin
from neopixel import NeoPixel
from time import sleep

RED = (127, 0, 0)
OFF = (0, 0, 0)
NUM_BARS = 4
PIXELS_PER_BAR = 8
TOTAL_PIXELS = NUM_BARS * PIXELS_PER_BAR

pixels = NeoPixel(Pin(15), TOTAL_PIXELS)

def set_bar_pixel(bar, pixel, color):
    if bar % 2 == 0:  # For even bars, pixels run top-down
        index = bar * PIXELS_PER_BAR + pixel
    else:  # For odd bars, pixels run bottom-up
        index = (bar + 1) * PIXELS_PER_BAR - pixel - 1
    pixels[index] = color

while True:
    # First and Third bars move down, Second and Fourth bars move up
    for i in range(PIXELS_PER_BAR):
        # Turn on the pixel at the i-th position for each bar
        set_bar_pixel(0, i, RED)  # 1st bar, move down
        set_bar_pixel(1, PIXELS_PER_BAR - i - 1, RED)  # 2nd bar, move up
        set_bar_pixel(2, i, RED)  # 3rd bar, move down
        set_bar_pixel(3, PIXELS_PER_BAR - i - 1, RED)  # 4th bar, move up

        pixels.write()
        sleep(0.1)

        # Turn off the pixels for the next round
        set_bar_pixel(0, i, OFF)
        set_bar_pixel(1, PIXELS_PER_BAR - i - 1, OFF)
        set_bar_pixel(2, i, OFF)
        set_bar_pixel(3, PIXELS_PER_BAR - i - 1, OFF)
        pixels.write()


UpandDown.py

# NeoPixels Rainbow on MicroPython
# Wokwi Example https://wokwi.com/arduino/projects/305569065545499202

from machine import Pin
from neopixel import NeoPixel
from time import sleep

RED = (127,0,0)
pixels = NeoPixel(Pin(15), 32)
while True:
  
  for i in range(32):
    pixels[i] = RED
    pixels.write()
    sleep(0.1)
    pixels[i] = (0,0,0)
    pixels.write()



Basic.py

from machine import Pin
from neopixel import NeoPixel
from time import sleep

RED = (127, 0, 0)
GREEN = (0, 127, 0)
OFF = (0, 0, 0)
NUM_BARS = 4
PIXELS_PER_BAR = 8
TOTAL_PIXELS = NUM_BARS * PIXELS_PER_BAR

pixels = NeoPixel(Pin(15), TOTAL_PIXELS)

def set_bar_pixel(bar, pixel, color):
    if bar % 2 == 0:  # For even bars, pixels run top-down
        index = bar * PIXELS_PER_BAR + pixel
    else:  # For odd bars, pixels run bottom-up
        index = (bar + 1) * PIXELS_PER_BAR - pixel - 1
    pixels[index] = color

def set_bar_pixel_reverse(bar, pixel, color):
    if bar % 2 == 0:  # For even bars, pixels run top-down
        index = (bar + 1) * PIXELS_PER_BAR - pixel - 1
    else:  # For odd bars, pixels run bottom-up
        
        index = bar * PIXELS_PER_BAR + pixel
    pixels[index] = color

while True:
    # First and Third bars move down, Second and Fourth bars move up
    for i in range(1,PIXELS_PER_BAR):
        # Turn on the pixel at the i-th position for each bar
        set_bar_pixel(0, i, RED)  # 1st bar, move down
        set_bar_pixel(1, PIXELS_PER_BAR - i - 1, RED)  # 2nd bar, move up
        set_bar_pixel(2, i, RED)  # 3rd bar, move down
        set_bar_pixel(3, PIXELS_PER_BAR - i - 1, RED)  # 4th bar, move up

        pixels.write()
        sleep(0.1)

        # Turn off the pixels for the next round
        set_bar_pixel(0, i, OFF)
        set_bar_pixel(1, PIXELS_PER_BAR - i - 1, OFF)
        set_bar_pixel(2, i, OFF)
        set_bar_pixel(3, PIXELS_PER_BAR - i - 1, OFF)
        pixels.write()

    for i in range(1,PIXELS_PER_BAR):
        # Turn on the pixel at the i-th position for each bar
        set_bar_pixel_reverse(0, i, RED)  # 1st bar, move down
        set_bar_pixel_reverse(1, PIXELS_PER_BAR - i - 1, RED)  # 2nd bar, move up
        set_bar_pixel_reverse(2, i, RED)  # 3rd bar, move down
        set_bar_pixel_reverse(3, PIXELS_PER_BAR - i - 1, RED)  # 4th bar, move up

        pixels.write()
        sleep(0.1)

        # Turn off the pixels for the next round
        set_bar_pixel_reverse(0, i, OFF)
        set_bar_pixel_reverse(1, PIXELS_PER_BAR - i - 1, OFF)
        set_bar_pixel_reverse(2, i, OFF)
        set_bar_pixel_reverse(3, PIXELS_PER_BAR - i - 1, OFF)
        pixels.write()

    
