System for wireless data acquisition with web supervision capability

Luka Šepetavc (2009) System for wireless data acquisition with web supervision capability. EngD thesis.

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Abstract

The thesis describes a design and realization of a system that is capable of acquiring data about environment, wirelessly transfering the data to another location, and presenting it on a screen and on a website. The description begins with a design and structure of electrical circuits. The reasons that lead to the choice of different elements and their role in the system are presented next. The system is divided into different electrical circuits or modules. They are transmitting, receiving, and network module. Each of them contatins a PIC18F series microcontroller. Design of software is described in the second half of the thesis. Custom programs were written for the transmitting and receiving modules. Among other tasks, the software is responsible for measuring the temperature, relative humidity, voltage, reading the state of the switch, and encoding and decoding of data which are transmitted over wireless link. Program of the network module is based on Microchip's TCP/IP Stack which also contains an implementation of a complete web server. On top of that, several other functions were added. They serve for reception, handling, storing and presentation of data that can be monitored on a screen or through a website. Last chapter describes how the system works and presents different use case examples. At the end, system is assessed against given requirements. Also, some possible improvements and upgrades are given.

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