--- title: "Raspberry Pi Pico IoT Demo – W5500 Ethernet + NeoPixel LED" url: "https://maker.wiznet.io/WIZnet/projects/raspberry-pi-pico-iot-demo-%E2%80%93-w5500-ethernet-neopixel-led/" markdown_url: "https://maker.wiznet.io/WIZnet/projects/raspberry-pi-pico-iot-demo-%E2%80%93-w5500-ethernet-neopixel-led/md" type: "UCC: User Created Content" author: "Bongjun Hur" author_url: "https://www.hackster.io/bjnhur/raspberry-pi-pico-iot-demo-w5500-ethernet-neopixel-led-8bc31c" editor: "WIZnet" editor_url: "https://maker.wiznet.io/" original_author: "Bongjun Hur" original_url: "https://www.hackster.io/bjnhur/raspberry-pi-pico-iot-demo-w5500-ethernet-neopixel-led-8bc31c" published: "2023-02-09" language: "en" likes: 3 views: 336 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # 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 Original author: Bongjun Hur (source: https://www.hackster.io/bjnhur/raspberry-pi-pico-iot-demo-w5500-ethernet-neopixel-led-8bc31c) ## Article ### **1. PreviewNo 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. - [How to add W5500 Ethernet to Raspberry Pi Pico (Python) – 1](https://www.hackster.io/bjnhur/how-to-add-w5500-ethernet-to-raspberry-pi-pico-python-1-c7340c) - [How to add W5500 Ethernet to Raspberry Pi Pico (Python) – 2](https://www.hackster.io/bjnhur/how-to-add-w5500-ethernet-to-raspberry-pi-pico-python-2-77c78c) ### **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 – - OR original files from adafruit CircuitPython 6.2.0 – [adafruit-circuitpython-raspberry_pi_pico-en_US-6.2.0.uf2](https://downloads.circuitpython.org/bin/raspberry_pi_pico/en_US/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](https://hackster.imgix.net/uploads/attachments/1286727/pic166_QU6MZJ3gL3.png?auto=compress%2Cformat&w=740&h=555&fit=max) 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](https://hackster.imgix.net/uploads/attachments/1286729/image_7ScWvgFnti.png?auto=compress%2Cformat&w=740&h=555&fit=max) 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](https://hackster.imgix.net/uploads/attachments/1286725/pic165_8lqQjxD2K8.png?auto=compress%2Cformat&w=740&h=555&fit=max) 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. For more detail information about this libraries, you visit Adafruit pages. - [CircuitPython NeoPixel](https://learn.adafruit.com/circuitpython-essentials/circuitpython-neopixel) - [Ethernet for CircuitPython with Wiznet5K](https://learn.adafruit.com/ethernet-for-circuitpython) ### **4. H/W Connection** refer the below pic, fritzing file also uploaded in this project ![Raspberry Pi Pico + W850io + Neopixel strip](https://hackster.imgix.net/uploads/attachments/1286730/image_RtsnpabgTU.png?auto=compress%2Cformat&w=740&h=555&fit=max) 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. – - 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. ```plaintext import neopixel pixel_pin = board.GP3 num_pixels = 2 ``` 2. init the neopixel lib. ```plaintext pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.1, auto_write=False) ``` 3. TCP socket listen & accept ```plaintext # 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 ```plaintext 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! - If the code is ok, you can see the below log from REPL of Pico board. (For REPL open, please refer this page [“How to add W5500 Ethernet to Raspberry Pi Pico (Python) – 1” – 6. REPL, Open serial terminal for printf()](https://www.hackster.io/bjnhur/how-to-add-w5500-ethernet-to-raspberry-pi-pico-python-1-c7340c#toc-6--repl--open-serial-terminal-for-printf--5) ) ![code.py running log DHCP, Server listen](https://hackster.imgix.net/uploads/attachments/1286743/image_kShkM92ESB.png?auto=compress%2Cformat&w=740&h=555&fit=max) code.py running log DHCP, Server listen I try to connect the board as below, and connection is ok. ![connected to Raspberry Pi Pico board](https://hackster.imgix.net/uploads/attachments/1286744/image_awTUOjZUlv.png?auto=compress%2Cformat&w=740&h=555&fit=max) connected to Raspberry Pi Pico board REPL window, ![socket is connected](https://hackster.imgix.net/uploads/attachments/1286745/image_DWD48F9jlE.png?auto=compress%2Cformat&w=740&h=555&fit=max) socket is connected I sent the message (RGB code) as below: 255, 0, 0 <– RED ![RED code send](https://hackster.imgix.net/uploads/attachments/1286746/image_sxCyTO4A9p.png?auto=compress%2Cformat&w=740&h=555&fit=max) RED code send Board echo the data “255, 0, 0” (3 in pic) and see the RED LED. ![RED On](https://hackster.imgix.net/uploads/attachments/1286747/image_hhjuWN5blv.png?auto=compress%2Cformat&w=740&h=555&fit=max) RED On In REPL window, ![Get data from PC](https://hackster.imgix.net/uploads/attachments/1286748/image_VBrB3i2tNw.png?auto=compress%2Cformat&w=740&h=555&fit=max) Get data from PC Let’s try to change Green, “0, 255, 0” ![Green On](https://hackster.imgix.net/uploads/attachments/1286762/image_ZX7u2hf6P5.png?auto=compress%2Cformat&w=740&h=555&fit=max) Green On Done. Enjoy my demo code~~~ --- Source: https://maker.wiznet.io/WIZnet/projects/raspberry-pi-pico-iot-demo-%E2%80%93-w5500-ethernet-neopixel-led/