Real world control from a Web page
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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.
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