import time
from machine import Pin
from neopixel import Neopixel

# Constants for number of LEDs and GPIO pin number
NUM_LEDS = 16
PIN_NUM = 6

# Initialize NeoPixel strip with specified number of LEDs and GPIO pin
np = Neopixel(NUM_LEDS, 0, PIN_NUM, mode="RGB")

# Function to create a "chase" effect on the LEDs
def chase(color, wait):
    for i in range(NUM_LEDS):
        np.set_pixel(i, color)  # Set the current LED to the specified color
        np.show()               # Update the LED strip
        time.sleep_ms(wait)     # Wait for the specified time in milliseconds
        np.set_pixel(i, (0, 0, 0))  # Turn off the current LED

# Main loop
while True:
    chase((255, 0, 0), 100)  # Red chase effect
    chase((0, 255, 0), 100)  # Green chase effect
    chase((0, 0, 255), 100)  # Blue chase effect