Tag: Arduino

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Arduino Hardware Programming Tutorial

Accessing Virtual Hosts with Arduino Ethernet Shield

If you've worked with the Arduino Ethernet Shield, you've probably noticed a limitation: while you can connect to an IP address, you can only reach the default virtual host on that server. This becomes a problem when working with shared hosting or VPS servers that host multiple websites on a single IP address.

The Problem

Modern web servers commonly use virtual hosting to serve multiple websites from a single IP address. When you make a basic HTTP request to an IP, the server returns the default site—not necessarily the one you want. On commercial shared hosting, you typically can't make your site the default host.

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Arduino Platform Projects

Arduino Ethernet Shield and Webclient

When you first get an Ethernet Shield for your Arduino (I'm using a Duemilanove), the natural thing to do is upload the example sketches to test it out. Everything was working perfectly until I hit the WebClient sketch—it just wouldn't connect.

The Problem

The WebClient example sketch that comes with the Arduino Ethernet library is designed to connect to a web server and fetch a page. The default example tries to connect to Google, but it kept failing on my setup. The frustrating part was that the WebServer sketch worked flawlessly, so I knew the shield itself was fine.

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