Raspberry Pi Pico IoT Demo – W5500 Ethernet + NeoPixel LED

HOWTO: Let's make a simple IoT RGB control project with Raspberry Pi Pico, WIZnet W5500, NeoPixel , WIZNET5K Adafruit lib on CircuitPython

COMPONENTS

PROJECT DESCRIPTION

1. Preview

No problem to skip this “Preview” Section, but it’s better to read them for using Ethernet on RP2040 Board.

Need to install CircuitPython on Raspberry Pi Pico board. because we can use WIZNET5K, Adafruit NeoPixel library for Ethernet, RGB control. For more detail, I already upload 2 projects with Raspberry Pi Pico, WIZ850io (W5500), Circuit Python env., Hardware connection, Ping demo example. Please visit the below project first.

2. Simple Install CircuitPython on Raspberry Pi Pico Board

Follow up below steps.

1. Download the below uf2 file link on your computer.

my github repo – https://github.com/bjnhur/pico-W5500/blob/main/adafruit-circuitpython-raspberry_pi_pico-en_US-6.2.0.uf2
OR original files from adafruit CircuitPython 6.2.0 – adafruit-circuitpython-raspberry_pi_pico-en_US-6.2.0.uf2

2. Push and hold the BOOTSEL button and plug your Pico into the USB port of your Raspberry Pi or other computer. Release the BOOTSEL button after your Pico is connected.

3. It will mount as a Mass Storage Device called RPI-RP2.

RPI-RP2 mount

4. Drag and drop the CircuitPython 6.2.0 UF2 file onto the RPI-RP2 volume. Your Pico will reboot. You are now running CircuitPython. If you see “CIRCUITPY” drive volume, you’re ready to enjoy CircuitPython on your Pico board as below pic.

install Circuit python

3. Install NeoPixel, W5500 Ethernet libraries

Very Easy. you find “neopixel.mpy”, “adafruit_wiznet5K”, “adafruit_bus_device” and copy the file into lib folder on your Raspberry Pi Pico Board.

copy CircuitPython lib into your RPi Pico board

For your installation, I upload the files on my github repo. just download all the files and folders. and then copy them into your Raspberry Pi Pico board.

https://github.com/bjnhur/pico-W5500/tree/main/lib

For more detail information about this libraries, you visit Adafruit pages.

4. H/W Connection

refer the below pic, fritzing file also uploaded in this project

Raspberry Pi Pico + W850io + Neopixel strip

5. Coding – Network RGB Control function

Copy below “Pico_W5500_Neopixel.py” code into your code.py on Raspberry Pi Pico board.

or

1. Download the code from GitHub. – https://github.com/bjnhur/pico-W5500/blob/main/Pico_W5500_Neopixel_Demo.py
2. Rename filename “code.py”
3. Then, copy it into your board volume(“CIRCUITPY”).

Let’s see the main code about Neopixel, Ethernet socket functions:

1. import neopixel lib, and assign Pin number.

import neopixel

pixel_pin = board.GP3
num_pixels = 2

2. init the neopixel lib.

pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.1, auto_write=False)

3. TCP socket listen & accept

# Initialize a socket for our server
socket.set_interface(eth)
server = socket.socket()  # Allocate socket for the server
server_ip = None # IP address of server
server_port = 50007 # Port to listen on
server.bind((server_ip, server_port))  # Bind to IP and Port
server.listen()  # Begin listening for incoming clients
print("server listen")
conn = None
while True:
if conn is None:
    conn, addr = server.accept()  # Wait for a connection from a client.
    print("socket connected")
    print(conn, addr)

4. After TCP connection, change the RGB Color from PC data

if conn is None:
    // accept
else :
    if conn.status in (
        SNSR_SOCK_FIN_WAIT,
        SNSR_SOCK_CLOSE_WAIT,
    ):
        print("socket closed")
        conn.close()
        conn = None
    else :
        # print("socket established", conn.status)
        data = conn.recv()
        if data:
            print(data)
            conn.send(data)  # Echo message back to client
            recvStr = data.decode('UTF-8')
            print(recvStr) # expected data format 255,0,0 - (R,G,B)
            color = recvStr.split(",", 2) # split
            print(color)
            if len(color) != 3 or not "".join(color).isdigit():
                pass
            red = int(color[0]) 
            green = int(color[1])
            blue = int(color[2])

            pixels.fill((red,green,blue))
            pixels.show()

6. Test Result

you need simple socket test program like “Hercules”. for more detail about this tool please visit the following site. Very useful socket test tool, UART terminal, Freeware!