code and fabrication resources for physical computing and networking
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This is a test server. I use it any time I have a client that needs to connect to a web server or chat server, and I want to see what the client is sending, byte for byte. You can modify it to send and receive whatever you need.
Technorati Tags: networked objects, networks
This program shows how to make a HTTP request in Processing.
Technorati Tags: networked objects, networks
This program connects a Wiring or Arduino module to the internet through a Lantronix serial-to-ethernet converter (Xport, WiPort, or Micro). The microcontroller makes a TCP connection to a web server first. Once it’s got a connection, it sends an HTTP request for a web page. When the web page comes back, it parses the page for < and > symbols, and takes the string between them. Then it converts the string to an integer. It assumes the string is made only of numeric ASCII characters (0 - 9).
This program couldn’t parse an entire web page very easily, so it’s best used in conjunction with a web scraper PHP script like this one, which reads the AIRNow site and extracts the Air Quality Index into a single string like this:
< AQI: 54>
This program was written to make an air quality index meter out of an analog voltmeter.
The electrical connections to the microcontroller are as follows:
The web scraper is written in PHP. Its code follows below the Arduino code.
Technorati Tags: networked objects, networks
Below are two designs for Arduino prototyping shields. They’re designed as generic boards on which you can develop any small circuit to connect to the Arduino board. One has a breadboard mounted on it, and the other has a simple PCB grid of holes.
Both of these are based on David Cuartielles’ shield design.
