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NewsForge: Real World Control from a Web Page

May 24, 2006, 08:30 (0 Talkback[s])
(Other stories by Rob Reilly)

"In 'Acquiring data from the physical world' we examined how to use a microcontroller to turn physical events (such as reading a switch) into data and send that data to a Linux box via the serial line. With this capability you can do things like counting people passing through a gate or recording how the temperature changes over time in a factory process. You can then send the data to a Web page. In this article, we'll do it in reverse--from a Web form, instruct a microcontroller to perform some actions.

"You can create a Web form on an Apache/Linux server, process the data with a PHP script, then push the control instructions down to the microcontroller over the serial line..."

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