---
title: "W5100-SPIボード"
url: "https://maker.wiznet.io/Alan/projects/w5100-spi/"
markdown_url: "https://maker.wiznet.io/Alan/projects/w5100-spi/md"
type: "UCC: User Created Content"
author: "SWITCHSCIENCE"
author_url: "https://trac.switch-science.com/wiki/W5100-SPI"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "SWITCHSCIENCE"
original_url: "https://trac.switch-science.com/wiki/W5100-SPI"
published: "2024-01-04"
language: "ja"
likes: 0
views: 302
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# W5100-SPIボード

> W5100-SPIボード

Original author: SWITCHSCIENCE (source: https://trac.switch-science.com/wiki/W5100-SPI)

## Article

This is a very small SPI connected Ethernet TCP/IP module using the [​WIZnet](http://www.wiznet.co.kr/) W5100 chip. W5100 is a hardwired TCP/IP processor.

[![Arduinoと接続](https://trac.switch-science.com/raw-attachment/wiki/W5100-SPI/W5100-arduino.JPG)](https://trac.switch-science.com/attachment/wiki/W5100-SPI/W5100-arduino.JPG)

It required a small fix to make the board work. The bug was about the connection of the transformer center tap.

This module works with Arduino. It is compatible with the [​Arduino Ethernet library](http://arduino.cc/en/Reference/Ethernet) in the Arduino 0012 distribution. It operates on 3.3V. However, it can be connected directly with 5V system like Arduino.

[![実装しました](https://trac.switch-science.com/raw-attachment/wiki/W5100-SPI/W5100-built.JPG)](https://trac.switch-science.com/attachment/wiki/W5100-SPI/W5100-built.JPG)

I have started this project before this summer. I have ordered manufacture of PCB on September, and I received it on October. I spent 3 hours to solder. I regret that I choose 1005 (metric) SMD LCR devices. 2012 devices are relatively easy. The main chip is 0.4mm pitch 80 pins LQFP.

[![ボード](https://trac.switch-science.com/raw-attachment/wiki/W5100-SPI/W5100-board.JPG)](https://trac.switch-science.com/attachment/wiki/W5100-SPI/W5100-board.JPG)

[![Board](https://trac.switch-science.com/raw-attachment/wiki/W5100-SPI/W5100-SPI.brd.png)](https://trac.switch-science.com/attachment/wiki/W5100-SPI/W5100-SPI.brd.png)

[​The schematics is here (bug fixed).](http://www.switch-science.com/trac/attachment/wiki/W5100-SPI/W5100-SPI.sch.png)

I am now working on a [single board W5100 with AVR board](https://trac.switch-science.com/wiki/AVR-W5100). I will continue to use 1005 devices because I will not continue to hand solder every board.

*(2008/10/17 - sgk)*

You can reach me by email to `sgk` at this domain.

---

Source: https://maker.wiznet.io/Alan/projects/w5100-spi/