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Turkish Journal of Electrical Engineering and Computer Sciences

DOI

10.3906/elk-2001-107

Abstract

In this paper, we first design a sensor with low power and low cost components, namely an MSP430G2553 microcontroller (MCU), nRF24L01+ communication unit, and a light-dependent resistor (LDR). Then, connecting these custom-designed sensors with a central node, a fusion center (FC), we form a wireless sensor network (WSN) in which sensors measure light intensities and send their measurements to the FC for final inference. Since the default addressing structure of nRF24L01+ can simultaneously connect up to 6 devices, in order to have more connections, we define a new addressing scheme for the transmissions between sensors and the FC. Finally, as a test case, we consider the task of the WSN in field estimation. The FC learns the spatial dependence between sensor measurements called a variogram. Then, using the appropriate variogram model, we perform ordinary kriging (OK), where the light intensity at an unobserved location is estimated as a weighted sum of received LDR measurements. Our test results show that the estimated light measurement using OK at a specific location becomes quite close to the actual LDR measurement at that location under the suitable parametric variogram models.

Keywords

Node design, medium access control, wireless sensor networks, field estimation

First Page

2702

Last Page

2717

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