scholarly journals Wi-PoS: A Low-Cost, Open Source Ultra-Wideband (UWB) Hardware Platform with Long Range Sub-GHz Backbone

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1548 ◽  
Author(s):  
Ben Van Herbruggen ◽  
Bart Jooris ◽  
Jen Rossey ◽  
Matteo Ridolfi ◽  
Nicola Macoir ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Open Source ◽  
Long Range ◽  
Indoor Localization ◽  
Average Energy ◽  
Multipath Fading ◽  
Outdoor Environment ◽  
Ultra Wideband ◽  
Hardware Platform ◽  
Open Source Hardware

Ultra-wideband (UWB) localization is one of the most promising approaches for indoor localization due to its accurate positioning capabilities, immunity against multipath fading, and excellent resilience against narrowband interference. However, UWB researchers are currently limited by the small amount of feasible open source hardware that is publicly available. We developed a new open source hardware platform, Wi-PoS, for precise UWB localization based on Decawave’s DW1000 UWB transceiver with several unique features: support of both long-range sub-GHz and 2.4 GHz back-end communication between nodes, flexible interfacing with external UWB antennas, and an easy implementation of the MAC layer with the Time-Annotated Instruction Set Computer (TAISC) framework. Both hardware and software are open source and all parameters of the UWB ranging can be adjusted, calibrated, and analyzed. This paper explains the main specifications of the hardware platform, illustrates design decisions, and evaluates the performance of the board in terms of range, accuracy, and energy consumption. The accuracy of the ranging system was below 10 cm in an indoor lab environment at distances up to 5 m, and accuracy smaller than 5 cm was obtained at 50 and 75 m in an outdoor environment. A theoretical model was derived for predicting the path loss and the influence of the most important ground reflection. At the same time, the average energy consumption of the hardware was very low with only 81 mA for a tag node and 63 mA for the active anchor nodes, permitting the system to run for several days on a mobile battery pack and allowing easy and fast deployment on sites without an accessible power supply or backbone network. The UWB hardware platform demonstrated flexibility, easy installation, and low power consumption.

Do-It-Yourself Design for Social Robots: An Open-Source Hardware Platform to Encourage Innovation

2017 ◽  
Vol 24 (1) ◽  
pp. 86-94 ◽  
Author(s):  
Cesar Vandevelde ◽  
Francis Wyffels ◽  
Bram Vanderborght ◽  
Jelle Saldien
Keyword(s):  
Open Source ◽  
Social Robots ◽  
Hardware Platform ◽  
Do It Yourself ◽  
Open Source Hardware

scholarly journals Energy Constrained Optimization for Spreading Factor Allocation in LoRaWAN

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4417 ◽  
Author(s):  
Shusuke Narieda ◽  
Takeo Fujii ◽  
Kenta Umebayashi
Keyword(s):  
Energy Consumption ◽  
Performance Improvement ◽  
Long Range ◽  
Spread Spectrum ◽  
Average Energy ◽  
Area Network ◽  
Wide Area Network ◽  
Spreading Factor ◽  
Average Energy Consumption ◽  
Distributed Genetic Algorithm

This paper discusses a spreading factor allocation for Long Range Wide Area Network (LoRaWAN). Because Long Range (LoRa) is based on chirp spread spectrum that each spreading factor is approximately orthogonal to each other, the performance of LoRaWAN can be enhanced by allocating the spreading factor appropriately to end devices (EDs). Several spreading factor allocation techniques have been reported. Techniques shown in existing studies can improve some characteristics (e.g. throughput or packet reception probability (PRP)); however, there are a few studies that have focused on the energy consumption of the EDs. The LoRa communication offers a low power communication and this enables the improvement of the performance in exchange for the energy consumption. This paper presents a performance improvement technique via spreading factor allocations for LoRaWAN. We define the optimization problem for the spreading factor allocation to maximize the PRP under a constraint for the average energy consumption of all the EDs. It enables for the performance improvement under the constraint of the average energy consumption of all the EDs by solving the problem. This study further develops a method to solve the defined problem based on a distributed genetic algorithm, which is metaheuristics method. Although the techniques shown in the existing studies give the average energy consumption as a result of the performance improvement by the spreading factor allocation, the presented technique can enhance the LoRaWAN performance by allocating the spreading factor to EDs under the constraint for the average energy consumption of all the EDs. Numerical examples validate the effectiveness of the presented technique. The PRP performance of the presented technique is superior to that of the techniques shown in the existing studies despite that the average energy consumption of all the EDs of the presented technique is less than that of the techniques shown in the existing studies.

scholarly journals Feasibility of LoRa for Smart Home Indoor Localization

2021 ◽  
Vol 11 (1) ◽  
pp. 415
Author(s):  
Kyungki Kim ◽  
Sining Li ◽  
Milad Heydariaan ◽  
Nour Smaoui ◽  
Omprakash Gnawali ◽  
...  
Keyword(s):  
Low Power ◽  
Long Range ◽  
Radio Frequency Identification ◽  
Indoor Localization ◽  
Low Cost ◽  
Smart Homes ◽  
Ultra Wideband ◽  
Line Of Sight ◽  
Wireless Technologies ◽  
Better Than

With the advancement of low-power and low-cost wireless technologies in the past few years, the Internet of Things (IoT) has been growing rapidly in numerous areas of Industry 4.0 and smart homes. With the development of many applications for the IoT, indoor localization, i.e., the capability to determine the physical location of people or devices, has become an important component of smart homes. Various wireless technologies have been used for indoor localization including WiFi, ultra-wideband (UWB), Bluetooth low energy (BLE), radio-frequency identification (RFID), and LoRa. The ability of low-cost long range (LoRa) radios for low-power and long-range communication has made this radio technology a suitable candidate for many indoor and outdoor IoT applications. Additionally, research studies have shown the feasibility of localization with LoRa radios. However, indoor localization with LoRa is not adequately explored at the home level, where the localization area is relatively smaller than offices and corporate buildings. In this study, we first explore the feasibility of ranging with LoRa. Then, we conduct experiments to demonstrate the capability of LoRa for accurate and precise indoor localization in a typical apartment setting. Our experimental results show that LoRa-based indoor localization has an accuracy better than 1.6 m in line-of-sight scenario and 3.2 m in extreme non-line-of-sight scenario with a precision better than 25 cm in all cases, without using any data filtering on the location estimates.

scholarly journals Red de sensores de humedad y temperatura de bajo costo

2019 ◽  
pp. 11-18
Author(s):  
Luis Manuel Mendoza-Pinto ◽  
María Jesús Espinosa-Trujillo ◽  
Jesús Humberto Peet-Manzón
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Wireless Sensors ◽  
Humidity Sensor ◽  
Low Cost ◽  
Good Choice ◽  
General Development ◽  
Hardware Platform ◽  
Open Source Hardware ◽  
To Receive

This article presents the development of a low cost network of wireless sensors that use an open source hardware platform, consisting of an ESP8266 and a digital temperature-humidity sensor to measure the parameters in an area determined by the range of the sensor. The general development of the system includes the use of open source software to receive information through the network. Tests of sensor effectiveness were performed at three different points in an air-conditioned area. The first sensor was placed outside the area, the second in the middle and the last one at the exit of the air conditioning. The results obtained allowed to know the behavior of temperature and humidity in the area and the effectiveness of the sensor network to measure the variables, the results of the measurements are presented in detail. Because the system is highly scalable, inexpensive and easy to build compared to other systems, it is a good choice for a wide variety of applications.

Design of a Bell-Shaped Ultra Wideband Antenna for Indoor Localization System

2015 ◽  
Vol 5 (6) ◽  
pp. 323 ◽  
Author(s):  
Nadia Ghariani ◽  
Mohamed Salah Karoui ◽  
Mondher Chaoui ◽  
Mongi Lahiani ◽  
Hamadi Ghariani
Keyword(s):  
Indoor Localization ◽  
Ultra Wideband ◽  
Localization System ◽  
Wideband Antenna
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