WIZnet Ethernet HAT[RP2040] + HTTP WebServer

Overview

WIZnet Ethernet HAT (Hardware Attached on Top) is a Raspberry Pi Pico pin-compatible board that utilizes W5100S and supports both 3.3V & 5V.

Please refer to this link to find more information about W5100S.

• Raspberry Pi Pico Pin-Compatible
• Ethernet (W5100S Hardwired TCP/IP CHIP)
• Product page : https://docs.wiznet.io/Product/iEthernet/W5100S/overview
• Support 4 Independent Hardware SOCKETs simultaneously
• Support SOCKET-less new Command: ARP-Request, PING-Request
• Support Auto-MDIX only when Auto-Negotiation mode

RP2040 Datasheet - https://www.raspberrypi.org/documentation/microcontrollers/raspberry-pi-pico.html

Prepare

Prepare Hardware

1. Combine WIZnet Ethernet HAT with Raspberry Pi Pico.

2. Connect ethernet cable to Ethernet HAT ethernet port.

3. Connect Raspberry Pi Pico to desktop or laptop using 5 pin micro USB cable.

- If you use W5100S-EVB-Pico, you can skip '1. Combine...'

Prepare Software

1.Installing CircuitPython

Install CircuitPython on Raspberry Pi Pico by referring to the link above.

https://learn.adafruit.com/getting-started-with-raspberry-pi-pico-circuitpython/circuitpython

• Download the below uf2 file link on your computer

CircuitPython 7.0.0 - https://downloads.circuitpython.org/bin/raspberry_pi_pico/en_US/adafruit-circuitpython-raspberry_pi_pico-en_US-7.0.0.uf2

2.Setup WIZnet Ethernet Library

Copy the WIZnet libraryinto the lib folder inside the Raspberry Pi Pico. https://learn.adafruit.com/ethernet-for-circuitpython/circuitpython-setup

Before continuing, make sure your board's lib folder has at least the following files and folders copied over: https://github.com/Wiznet/RP2040-HAT-CircuitPython

adafruit_bus_device

adafruit_wiznet5k

adafrui_wsgi

adafruit_requests.py

Run PICO

1.Install Programs

The following serial terminal program is required for HTTP Server test, download and install from below links.

✔Tera Term

Teraterm is a terminal console program and is an interface that helps PCs and users communicate. The main purpose is to be used for serial communication purposes.

Before this, you should find the Raspberry Pi Pico COM port number from "Device Manager" on your PC.

2. How to WebServer Example

Access the WIZnet github, get the Circuit Python source, and copy it to code.py inside the pico.

Setup Webserver Example - download https://github.com/Wiznet/RP2040-HAT-CircuitPython/tree/master/examples/HTTP/Webserver

Press "Ctrl+D" on the terminal window. you can see the messages as follows.

Conversely, pressing "Ctrl+C" causes the running source to stop.

Start WebServer on browser

if you open the HTML web page and enter 192.168.1.4, you will see the page. In addition, you will see the IP address of the server connected and WIZnet chip.

if you press the ON button below, the LED built into the Pico turns on.

Turn on LED, Likewise, if you press OFF, the LED turns off.