Search

This paper discuss the tradeoffs in implementation of Data Acquisition software developed for an embedded system for monitoring and controlling temperature and humidity running on real time Linux operating system. Real world physical parameters such as temperature and humidity are beyond the control of software processes running in the computer and are independent real world incidents are not governed by scheduling policies. They occur simultaneously but independently, when different real world data is manipulated through software processes, the different data acquisition task that are under some scheduling criteria of the computer should be able to cope up with the real world data generated by unscheduled real world event. This paper discusses the difficulties associated with the data acquisition software developed on real time Linux operating system. This paper also proposes a solution for solving data acquisition problem associated with software processes for manipulating multiple different real world physical parameters on a computer system. This experiment also serves as an excellent example of overhead associated with process switching while manipulating data of different systems.

System developed for the stated study is a microcontroller based embedded system for monitoring and controlling of parameters like temperature and humidity. It can be implemented using simple client server technology as well as web technology. Users belong to the organizational domain can use their own Intranet for monitoring and controlling of parameters designed on simple client server technology whereas users beyond the scope of Intranet can use Internet interface designed using web technology. Both the technologies are having its own advantages as well as disadvantages. This paper explores the technological implications of the system using client server as well as web technology. Embedded hardware circuit is fabricated in to two separate digital circuits connecting two COM ports of Embedded server. First circuit will monitor temperature and humidity and display same in LCD. Application program executed in computer reads COM port and display the same in monitor and store in database. Second digital circuit will provide necessary hardware control of devices for controlling of temperature and humidity automatically. It is implemented through relay based on the user entered set value of temperature and humidity which is stored in database of computer. Developed system enable its both Intranet as well as or Internet users for monitoring and setting new values of temperature and humidity through the respective front end.