WIZnet Ethernet HAT[RP2040] + HTTP WebClient

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

 

WIZnet Ethernet HAT

 

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

RP2040

 

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 library Into 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 Client test, download and install from below links.

Tera Term

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

 

2. How to WebClient Example

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

– Press “Ctrl+D” on the terminal window. you can see the messages as follows.

– Use DNS to access the address of the server. After that, it accesses the server in each URL and prints the contents. The text of each URL is as follows.

 

– It is the original text on the HTML server.