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MicrocontrollersMonitoring the real world with a computer presents problems of electrical interfaces. Using microcontrollers allows you to interface easily to digital and analog signals at a reasonable cost. Microcontrollers can be programmed to scan binary and analog inputs then send XML encoded data out its RS232 port.
------------
| Client |
| Computer | RS232 -------------------
| |------<------<-------| Microcontroller |
------------ XML Stream | |
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| | |
TTL | Analog
CMOS
Here is a HC11 program that does the job. The program scans digital and analog inputs, then sends XML encoded data using the RS232 port once per second.XML.asm |
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http://sourceforge.net/projects/frontiertech/