Using a touch sensitive wire to change colors.

code3 exposed wire.py

import time
import board
import neopixel
from digitalio import DigitalInOut, Direction, Pull
import touchio


touch_pad = board.A0 # the ~1 pin
touch = touchio.TouchIn(touch_pad)

pixel_pin = board.D2
num_pixels = 16
 
pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.3, auto_write=False)
 
RED = (255, 0, 0)
YELLOW = (255, 150, 0)
GREEN = (0, 255, 0)
CYAN = (0, 255, 255)
BLUE = (0, 0, 255)
PURPLE = (180, 0, 255)
WHITE = (255, 255, 255)
OFF = (0, 0, 0)

colors = [RED,YELLOW,GREEN,CYAN,BLUE,PURPLE,WHITE,OFF]
now = 0

while True:
    if touch.value:
        now = now + 1
        if (now >= len(colors)): #check to see if we exceed our list of colors
            now = 0
        pixels.fill(colors[now])
        pixels.show()
    time.sleep(0.1)  # debounce delay