---
title: "W5100-SPI board \"Pistachio\""
url: "https://maker.wiznet.io/WIZnet/resellers/w5100-spi-board-pistachio/"
markdown_url: "https://maker.wiznet.io/WIZnet/resellers/w5100-spi-board-pistachio/md"
type: "VAR: Value-Added Reseller Products"
author: "switch-science"
author_url: "http://trac.switch-science.com/wiki/W5100-SPI-en"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "switch-science"
original_url: "http://trac.switch-science.com/wiki/W5100-SPI-en"
published: "2023-04-26"
language: "en"
hardware: ["WIZnet W5100"]
likes: 0
views: 152
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# W5100-SPI board "Pistachio"

> W5100-SPI board "Pistachio"

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

## Components

- **WIZnet W5100** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5100))

## Article

**DETAILS**

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.

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.

---

Source: https://maker.wiznet.io/WIZnet/resellers/w5100-spi-board-pistachio/