| 1. |
- Postigo-Malaga, Mauricio, et al.
(author)
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Autonomous Wireless Sensor System for Emergency Monitoring Roads with Low Communication Coverage
- 2023
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In: Electronics. - : MDPI. - 2079-9292. ; 12:23
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Journal article (peer-reviewed)abstract
- Rural areas often face communication challenges due to limited mobile coverage on remote roads, posing significant difficulties in reporting emergencies and accidents. This study presented an autonomous vehicle tracking system using low-cost radar sensors to detect possible emergencies in the sections of roads with low cell coverage. The radar sensor system could determine the number of vehicles that passed through the nodes and classify them based on the vehicle type. Each node within the system is equipped with ten radars, a processor unit, and a radio transmitter to communicate with the network in real-time, achieving a rapid response time of just 0.2 s. To ensure seamless connectivity, two distinct wireless communication networks are employed, one for the connection between the towers in the same node and the other for the connection between nodes and a center with cellular coverage. The results of this study can be useful in conveying emergency messages, as well as traffic management.
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| 2. |
- Postigo-Málaga, Mauricio, et al.
(author)
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Low Cost Outdoors WSN Parking System for Metropolitan Areas Based on RSS
- 2019
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In: 2019 10th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS). - : IEEE. - 9781728140698
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Conference paper (peer-reviewed)abstract
- Finding a free parking space in the metropolitan areas during rush hour is time consuming and it leads to traffic congestions and air pollution. Wireless Sensor Network (WSN) can be used to obtain information related to the parking condition requiring very little installation and maintenance costs. In this work, we present the design and implementation of an outdoor parking system based on Wireless Sensor Networks (WSNs), received signal strength (RSS) and pattern recognition algorithms to effectively find free parking spaces. Simulation and experiment results show good performance in the verification of the parking system. XBee-PRO 900HP-S3B modules with high performance and low power consumption were used. These modules support the IEEE-802.15.4 protocol for communication in the 900 MHz band and can be configured in different network topologies. The received signal strength (RSS) was measured to form fingerprints for the parking spaces availability (busy or vacant). Kalman filters were implemented to improve RSS which varies due to the effects of short-term fading. The parking spaces availability was evaluated with different classification algorithms in the WEKA environment with results up to 85%.
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| 3. |
- Quiroz Oviedo, Jorge Enrique, et al.
(author)
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Wireless sensor nodes for early detection of food degradation in restaurants and commercial kitchens
- 2021
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In: 2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). - : IEEE. - 9781728195391 ; , s. 1-6
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Conference paper (peer-reviewed)abstract
- The climate issue is the biggest challenge of our time and food waste can be considered an unnecessarily large environmental burden. Reducing food waste and increasing resource management in the food chain is a priority area in a sustainable society, therefore technology development must be used in advantage to achieve long-term environmental and sustainability goals. In this work, we have developed a hardware / software integrated wireless sensor network to get information as early as possible about food going bad. The developed wireless sensor network is built using Raspberry Pi, ESP-WROOM-32 microcontroller with integrated communication modules and gas-sensitive sensors. The remote control for data collection and other tasks is performed wirelessly from a laptop and has been programmed in Phyton. Experiments have been carried out with promising results.
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| 4. |
- Rainer, Julio, et al.
(author)
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Measurements of 3G and 4G signal attenuation in adobe buildings structures
- 2020
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In: 2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). - 9781728144603 ; , s. 1-6
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Conference paper (peer-reviewed)abstract
- Fast internet access is not obvious in rural areas and when it is time to install we realize that houses are built with special materials. The properties of these materials affect the electromagnetic wave propagation in a different way than the houses in the cities. In this work, we perform an analysis of signal quality in 700-MHz and 900-MHz bands for 3G and 4G communication systems for adobe buildings. Three different adobe wall scenarios were analyzed: conventional adobe, adobe doped with salt and adobe doped with coal. Then two kind of measurements have been carried out, the first one a Network Vector Analyzer (VNA) and two HyperLOG antenna were used and in the second one a Samsung S8 with the software from TEMS Pocket 16.3.7.26 was used. Wave propagation and signal quality measurements made on adobe walls provide satisfactory results showing large variation in attenuation and signal quality due to the material used in adobe.
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