Design of GPS based transducer interface module (TIM) (based on IEEE 1451 standard)
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A network of sensors is being developed for use in monitoring a host of environmental characteristics across the area of deployment such as light, temperature, sound and many others. The data acquired by these sensors becomes useful only when the location information is known, as to where the phenomenon had taken place. This information could be provided with the help of a GPS (Global Positioning System) receiver which determines the position of the sensor at any instant, when coupled along with it. The goal of this thesis is to design a GPS based Transducer Interface Module (TIM) based on IEEE 1451 standard which when integrated along with other sensors would provide the location details in real time, after the sensors are deployed in the network. In a typical TIM setup, a GPS receiver was interfaced to a microcontroller to retrieve the position information and displayed it to the user. The necessary software was developed using PIC C which is simple and could be used for any position based sensor with similar arrangement, with subtle changes to it. The associated Transducer Electronic Data Sheet information (TEDS) was also compiled using a TEDS compiler software.