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Microcontrollers

Monitoring 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        |                 |
                                       -------------------
                                           |   |    |
                                          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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