This report describes the preparation of gas sensors based on SnO2 semiconductor nanostructure thin films synthesized using chemical bath deposition (CBD) technique. As the rapid demand of the gas sensors based on the semiconductor materials, there have been significant efforts to improve the performance of the semiconductors sensors. SnO2, which has good electrical and mechanical properties, is one of the potential materials to be developed. In the present study, the SnO2, prepared using CBD technique with stannous cloride as precursors, has nanopattern that give much SO2 particles to access into the semiconductor surface. The resulting nanostructure SnO2 thin films have been confirmed by X Ray Diffractions (XRD), Energy Dispersive Spectroscopy (EDS) and Scanning Electronic Micrsocopy (SEM). The as fabricated SnO2 thin films sensors were then characterized as SO2 gas sensors in various concentrations for several different operating temperatures. The sensors have good sensitivity as low as 30 ppm of SO2 gas at the optimum temperature of 2000 C.

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In this paper, development progress of a long-range radio communication-based fishing assistant system called e-Nelayan is reported. The purpose of the system is to increase the productivity, safety, and welfare of fishermen using mobile phone and long-range radio based system that enables them to report maritime violations, access and exchange information regarding weather, fishing area, and marketplace, as well as communicate with mainland using Android-based mobile phone within extended range. We used LoRaWAN as a base technology for long-range communication scheme. In this work, the test conducted to obtain an insight to e-Nelayan device (LoRa-based) received RSSI and its packet loss. The received data collected in a server also includes the GPS tracking data. The test results show that our system can reach about 5 km of distance between end-node to the LoRa Gateway within urban area (LoS configuration) and about 2 km for NLOS configuration.