ESP32-S3-DevKitC-1/CircuitPython to drive NeoPixel, onboard and offboard.

This exercise show how ESP32-S3-DevKitC-1 (running CircuitPython 7.3.2) to drive NeoPixel, onboard RGB and offboard 16 x WS2812 5050 RGB LED Square with Integrated Drivers.

Please note that ESP32-S3-DevKitC-1 have two version, ver 1.0 and ver 1.1, The main difference lies in that the RGB LED is connected to different pins.
On ver 1.0, my board, it's driven by GPIO48.
On ver 1.1, driven by GPIO38.

Adafruit CircuitPython NeoPixel library is needed. To install library, read last post "Download and install CircuitPython Library to CIRCUITPY drive's lib folder".

cpyS3_NEOPIXEL.py, drive onboard RGB.

import time
import neopixel
import board

def cycleNeopixel(wait):
    for r in range(255):
        pixel[0] = (r, 0, 0)
        time.sleep(wait)
    for r in range(255, 0, -1):
        pixel[0] = (r, 0, 0)
        time.sleep(wait)
        
    for g in range(255):
        pixel[0] = (0, g, 0)
        time.sleep(wait)
    for g in range(255, 0, -1):
        pixel[0] = (0, g, 0)
        time.sleep(wait)
        
    for b in range(255):
        pixel[0] = (0, 0, b)
        time.sleep(wait)
    for b in range(255, 0, -1):
        pixel[0] = (0, 0, b)
        time.sleep(wait)
        
print("==============================")
print("ESP32-S3-DevKitC-1/CircuitPython NeoPixel exercise")
print("to control onboard RGB NeoPixel")
print("neopixel version: " + neopixel.__version__)
print("board.NEOPIXEL: ", board.NEOPIXEL)
print()

# Create the NeoPixel object
pixel = neopixel.NeoPixel(board.NEOPIXEL,
                          1,
                          pixel_order=neopixel.GRB)
pixel[0] = (0, 0, 0)
time.sleep(2.0)

cycleNeopixel(0.005)

pixel[0] = (0, 0, 0)
time.sleep(2.0)

print("- bye -\n")

cpyS3_extNEOPIXEL_walking.py, walking on external 16X NeoPixel.

import time
import neopixel
import board

num_of_pix = 16

def offAllPix():
    pixel[0] = (0, 0, 0)
    for i in range(num_of_pix):
        extPixel[i] = (0, 0, 0)

extNeoPixel = board.IO47
        
print("==============================")
print("ESP32-S3-DevKitC-1/CircuitPython NeoPixel exercise")
print("to control external NeoPixel on GPIO47")
print("neopixel version: " + neopixel.__version__)
print("board.NEOPIXEL: ", board.NEOPIXEL)
print("extNeoPixel: ", extNeoPixel)
print()

# Create NeoPixel objects
pixel = neopixel.NeoPixel(board.NEOPIXEL,
                          1,
                          pixel_order=neopixel.GRB)
extPixel = neopixel.NeoPixel(extNeoPixel,
                          num_of_pix,
                          pixel_order=neopixel.GRB)
offAllPix()
time.sleep(2.0)

def shiftMask():
    for i in range(num_of_pix-1, 0, -1):
        enableMask[i] = enableMask[i-1]
    enableMask[0] = 0

def setPix(col):
    pixel[0] = col
    for i in range(num_of_pix):
        if enableMask[i] == 1:
            extPixel[i] = col
        else:
            extPixel[i] = (0, 0, 0)

enableMask = [0]*num_of_pix


for color in ((50, 0, 0), (0, 50, 0), (0, 0, 50)):
    print("color: ", color)
    enableMask[0] = 1
    for c in range(num_of_pix):
        setPix(color)
        shiftMask()
        time.sleep(0.5)
    

offAllPix()
time.sleep(2.0)

print("- bye -\n")

cpyS3_extNEOPIXEL_random.py, display random pixel on external 16X NeoPixel.

import time
import neopixel
import board
import random

num_of_pix = 16

pixBuffer = [(0, 0, 0)]*num_of_pix

def offAllPix():
    pixel[0] = (0, 0, 0)
    for i in range(num_of_pix):
        extPixel[i] = (0, 0, 0)

extNeoPixel = board.IO47
        
print("==============================")
print("ESP32-S3-DevKitC-1/CircuitPython NeoPixel exercise")
print("display random color on external NeoPixel")
print("neopixel version: " + neopixel.__version__)
print("board.NEOPIXEL: ", board.NEOPIXEL)
print("extNeoPixel: ", extNeoPixel)
print()

# Create NeoPixel objects
pixel = neopixel.NeoPixel(board.NEOPIXEL,
                          1,
                          pixel_order=neopixel.GRB)
extPixel = neopixel.NeoPixel(extNeoPixel,
                          num_of_pix,
                          pixel_order=neopixel.GRB)
offAllPix()
time.sleep(2.0)



def displayPix():
    for i in range(num_of_pix):
        extPixel[i] = pixBuffer[i]

enableMask = [0]*num_of_pix


while True:
    pixBuffer[random.randint(0, num_of_pix-1)] =(
        random.randint(0, 30),
        random.randint(0, 30),
        random.randint(0, 30))
    displayPix()
    time.sleep(0.01)

offAllPix()
time.sleep(2.0)

print("- bye -\n")