We put up some holiday lights in the Mission Street windows. (We call them Holiday Lights both as an ecumenical gesture of goodwill as well as to annoy the "War on Christmas" wingnuts.)
Naturally, you can control them on the web using the bare-bones interface at URL: http://lights.netisland.net:8080/
This is served by a pure Python webserver running on a Fit-PC Ubuntu micro-PC.
Basic info: /home/lights/server/filelooop.py This is the script that runs forever, and does the Actual Work of switching the lights on and off. It reads the file /home/lights/sequence, which defines the light sequence, and then uses the RelayControl class to communicate with the external relay bank. /home/lights/sequence The file read by filelooop.py that defines the light sequence currently active. The first line of this file defines how long (in milliseconds) we should sleep before advancing to the next state. The rest of the file is a list of states to iterate through. For example: 1000 10000000 01000000 00100000 00010000 00001000 00000100 00000010 00000001 We sleep for 1 second (1000 milliseconds) between states. In the first state, the first light is on, and the rest are off. In the second state, the second light is on, and the rest are off. In the third state, the third light is on, and the rest are off. etc. (There's code in place in filelooop.py to also support state lines in the syntax of "<state> <delay>", to sleep for an amount of time different than the "global delay", but I haven't actually tested this behavior yet.) /home/lights/*.seq A list of pre-programed sequences. /home/lights/server/webserver.py A full webserver/framework implementation, currently configured to listen on port 8080. When you request "/", it returns a list of hyperlinks to each of the *.seq files in lights's home directory. If you click on one of those links, it copies the contents from the *.seq file to /home/lights/sequence, so filelooop.py will start processing it instead of whatever it was previously processing. /home/lights/set.html When you use webserver.py to request a *.seq file, it returns the contents of /home/lights/set.html to the browser. Right now, this file contains just "<h1>Thanks!</h1>". We should make it look pretty, and probably also have a meta refresh to redirect the user back to / (the directory listing) after a few seconds, or something. If we want to get fancy, we should also look into using one of the python templating libraries, so we can have a static index.html page independent of the code, and then make that index.html file look pretty, too. We just need to find out how to interpolate a list of files to display in he the directory listing.