This is my PHP library for controlling a Robot Electronics ETH008 unit.
http://www.robot-electronics.co.uk/htm/eth008tech.htm
This unit has eight programmable relays and an Ethernet connector.
Here are the files:
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functions.php This is the library with the functions you need to call
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tests.php These are the unit tests for the functions library ; it shows how you use the functions
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index.html This is a sample page with two buttons asynchronously controlling four relays.
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ajax.php This is the back end for the sample. Button 1 turns on relays 1,7,8 (blue, yellow, green) Button 2 turns on relays 1,4,8 (blue, red, green)