Development of differential sensor interface for GSM communication /
This research work focuses on the design, simulation and implementation of differential resistive sensor interface. The importance of the findings of this work lies in exploring problems such as non-linearity errors for better accuracy and reducing long interface-chain for ease and simplicity of the...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
Kuala Lumpur :
Kulliyyah of Engineering, International Islamic University Malaysia,
2011
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| Subjects: | |
| Online Access: | Click here to view 1st 24 pages of the thesis. Members can view fulltext at the specified PCs in the library. |
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| Summary: | This research work focuses on the design, simulation and implementation of differential resistive sensor interface. The importance of the findings of this work lies in exploring problems such as non-linearity errors for better accuracy and reducing long interface-chain for ease and simplicity of the system. The interface is explored and used along with potentiometer and a thermistor, both connected in a differential manner. The potentiometer is ultimately representing displacement while thermistor represents environmental condition of temperature. The design involves using a 555- timer, external components of resistors, diodes and a capacitor. Identification of the non-linear regions of the thermistor curve is carried out and the circuit is configured to operate over a linear segment. The resulting circuit is interfaced to a microcontroller and a GSM/GPRS modem, both properly programmed in specified code instructions. The results obtained are benchmarked with other recently published work and a better linearized output of the thermistor response curve is obtained. The circuit is analyzed before it is simulated using ORCAD PSPICE and MATLAB code. A comparison between the simulation and experimental results show the circuit's preferential utility over the circuits currently in use for similar applications. A frequency and voltage output are obtained, showing how a small change in differential value of the resistor can bring galloping effect on the signal path at temperature of 600C and an error of 0.1% resolution is found and reported. Through experiments, frequency and duty cycle responses are obtained to show that the proposed system is reliable, more accurate as its preferential advantages. |
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| Item Description: | Abstract in English and Arabic. "A dissertation submitted in fulfilment of the requirement for degree of Master of Science in Communication Engineering."--On t.p. |
| Physical Description: | xvii, 168 leaves : ill. charts ; 30cm. |
| Bibliography: | Includes bibliographical references (leaves 121-124). |