I got an Ethernet shield (Arduino talk for "eXpansion card") for my Arduino Uno microcontroller yesterday.
Today I hooked a temperature probe and LED (light) to the Arduino and played with setting it up as a web server. Yes, that's right, setting it up to deliver content on the Internet and to practice having remote access and control of things. I was able to get a web page that shows the inputs from the Arduino analog channels, and it keeps track of how many times the value randomly exceeds or equals 300 since it was turned on or reset. If a value eXceeds or equals 300 then it momentarily turns bold as weLL.
The temperature probe is tied to analog input 0, so that is why A0 is significantly lower than the others A1-A5 that are just floating with nothing attached. The web page refreshes automaticaLLy every 50 seconds. In the time I have taken to write this blog post the number analog values eXceeding or equaling 300 has been 21, so it happens occasionaLLy. Again, this doesn't reaLLy mean anything significant, I'm just measuring something that happens occasionaLLy in the real world and reporting it and giving slightly different visualizations during events.
It displays the room temperature in F by default, but if you feed it a message of "esbbC" at the end of my regular URL, it wiLL put up a first line that says "hi esby!" - I used fmcgmccllc's nickname for me (she has the blog Detroit Automotive Meltdown) AND then it displays the temperature in Centigrade. My picture below actuaLLy has "esbbF". The temperature choice of F or C determines whether the LED on my circuit board turns ON or OFF. I tied a picture of a spinning Carbon Nanotube from wikipedia next, then there is a form for entering a first and last name. The form doesn't reaLLy do anything with the names just yet, I am just playing around.
Later this afternoon I tied my Arduino to the Internet by using a DDNS service, so people around the world can see what the temperature is in my living room.
This is the link to my Arduino: http://esbboston.is-a-geek.com
This picture shows the web app running on my iPad from a different network.
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