The work presents the project of ultra-low power sensor node for IoT applications with LoRa interface, which was successfully designed and tested. The main features of this design is its low power consumption, long distance communication and secure data transmission. By using external nano timer TPL5110 it is possible to reduce the end node consumption current Ic from 4.2uA to 290nA. This increases battery life and sensor autonomous operation.
{"title":"Research and development of ultra-low power LoraWan sensor node","authors":"D. Tokmakov, Stanislav Asenov, Svetoslav Dimitrov","doi":"10.1109/ET.2019.8878674","DOIUrl":"https://doi.org/10.1109/ET.2019.8878674","url":null,"abstract":"The work presents the project of ultra-low power sensor node for IoT applications with LoRa interface, which was successfully designed and tested. The main features of this design is its low power consumption, long distance communication and secure data transmission. By using external nano timer TPL5110 it is possible to reduce the end node consumption current Ic from 4.2uA to 290nA. This increases battery life and sensor autonomous operation.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126684073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Marinov, Borislav Ganev, N. Djermanova, T. Tashev
The paper presents the noise analysis of different sensor types using Allan Variance (AV). Compared to the conventional variance that assesses the variation around the mean value of the aggregate data surveyed, AV estimates variations by averaging measurements for different periods. This approach often leads to the possibility of directly distinguishing the different noise types and to better convergence of the process of assessing their levels. An important advantage of this method is that there is no need for any further transformations. According to IEEE recommendations, the AV approach is the preferred method for identifying stochastic error and for determining the type of noise in different types of inertial sensors. The purpose of this work is to study the applicability of the AV analysis method for efficient noise analysis for other types of sensors such as CO2 and MEMS pressure sensors.
{"title":"Analysis of Sensors Noise Performance Using Allan Deviation","authors":"M. Marinov, Borislav Ganev, N. Djermanova, T. Tashev","doi":"10.1109/ET.2019.8878552","DOIUrl":"https://doi.org/10.1109/ET.2019.8878552","url":null,"abstract":"The paper presents the noise analysis of different sensor types using Allan Variance (AV). Compared to the conventional variance that assesses the variation around the mean value of the aggregate data surveyed, AV estimates variations by averaging measurements for different periods. This approach often leads to the possibility of directly distinguishing the different noise types and to better convergence of the process of assessing their levels. An important advantage of this method is that there is no need for any further transformations. According to IEEE recommendations, the AV approach is the preferred method for identifying stochastic error and for determining the type of noise in different types of inertial sensors. The purpose of this work is to study the applicability of the AV analysis method for efficient noise analysis for other types of sensors such as CO2 and MEMS pressure sensors.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125769427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
FPGA implementation of Boolean functions with multiplexers using a laboratory board, based on Spartan-6 devices, is presented in the paper. It will be used in the training of electrical engineers in the courses “Digital Circuits” and “Pulse and Digital Devices” introducing students of electrical specialties to the main topics in digital electronics. One of the topics is “Implementation of Boolean functions using multiplexers” and using the laboratory board makes the topic more attractive and easier for assimilation by the students.
{"title":"FPGA Implementation of Boolean Functions Using Multiplexers","authors":"A. Borodzhieva, I. Stoev, V. Mutkov","doi":"10.1109/ET.2019.8878504","DOIUrl":"https://doi.org/10.1109/ET.2019.8878504","url":null,"abstract":"FPGA implementation of Boolean functions with multiplexers using a laboratory board, based on Spartan-6 devices, is presented in the paper. It will be used in the training of electrical engineers in the courses “Digital Circuits” and “Pulse and Digital Devices” introducing students of electrical specialties to the main topics in digital electronics. One of the topics is “Implementation of Boolean functions using multiplexers” and using the laboratory board makes the topic more attractive and easier for assimilation by the students.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132882209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The current paper discusses the design of the pollution and communication system which is capable to measure the H2S levels in very low concentrations in ppb range. The system also reads the temperature and humidity values from the analog output values and send the measured values to the remote server via GSM/GPRS connection, which are stored in MySQL table for further analysis and visualization. The ultra-low noise design of the AD conversion is proposed. To achieve better sensitivity all parts of the design such as AD converter, voltage reference and power supply IC are specially selected towards the better noise characteristics.
{"title":"Ultra-low Noise AD Conversion Design for Measurement of Air Pollutants","authors":"R. Yordanov, R. Miletiev, E. Iontchev","doi":"10.1109/ET.2019.8878507","DOIUrl":"https://doi.org/10.1109/ET.2019.8878507","url":null,"abstract":"The current paper discusses the design of the pollution and communication system which is capable to measure the H2S levels in very low concentrations in ppb range. The system also reads the temperature and humidity values from the analog output values and send the measured values to the remote server via GSM/GPRS connection, which are stored in MySQL table for further analysis and visualization. The ultra-low noise design of the AD conversion is proposed. To achieve better sensitivity all parts of the design such as AD converter, voltage reference and power supply IC are specially selected towards the better noise characteristics.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130994265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To control the battery charge from a solar panel, the DC / DC converters controlled by the MPPT controller are often used to lower DC power. The major problem that is solved in most researches is to quickly determine the power point of the panel. This article proposes developing a more functionality controller and maintaining battery power even in cloudy weather. Calculations are made for a given function in different modes of the solar panel. Values are recorded and so we have a number of functions that are subsequently called for the particular mode. Two PID controllers are implemented in the current limitation mode. Calculate the first power derivative and keep the result to be zero.
{"title":"Development of a Solar MPPT Controller with AI for Control SEPIC Converter","authors":"P. Panaiotov, G. Goranov","doi":"10.1109/ET.2019.8878606","DOIUrl":"https://doi.org/10.1109/ET.2019.8878606","url":null,"abstract":"To control the battery charge from a solar panel, the DC / DC converters controlled by the MPPT controller are often used to lower DC power. The major problem that is solved in most researches is to quickly determine the power point of the panel. This article proposes developing a more functionality controller and maintaining battery power even in cloudy weather. Calculations are made for a given function in different modes of the solar panel. Values are recorded and so we have a number of functions that are subsequently called for the particular mode. Two PID controllers are implemented in the current limitation mode. Calculate the first power derivative and keep the result to be zero.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"170 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127580136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
There are several guiding methods for calculating one of the main reliability indicators-failure rate of electronic components. Generally, methods are divided into three groups: methods with multiplicative pi-factors, methods with additive pi-factors and combined methods. The present paper compares the results and applicability of two methods - MIL-HDBK-217F and FIDES, which over the last years have established themselves as basic methods.
{"title":"Reliability Analysis of Electronic Circuit of Compact FIuorescent Lamp using Methods MIL-HDBK-217F and FIDES","authors":"P. Prodanov, D. Dankov","doi":"10.1109/ET.2019.8878592","DOIUrl":"https://doi.org/10.1109/ET.2019.8878592","url":null,"abstract":"There are several guiding methods for calculating one of the main reliability indicators-failure rate of electronic components. Generally, methods are divided into three groups: methods with multiplicative pi-factors, methods with additive pi-factors and combined methods. The present paper compares the results and applicability of two methods - MIL-HDBK-217F and FIDES, which over the last years have established themselves as basic methods.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120967987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the current paper an optimization of bidirectional converter for electric vehicles applications is proposed. A mathematical model of the DC/DC converter is described. The simulations are realized in MATLAB/Simulink. The optimization of the value of the passive components is the main purposes of this research.
{"title":"Optimization of Bidirectional Converter for Applications in Electric Vehicles","authors":"Gergana Vacheva, N. Hinov, B. Gilev","doi":"10.1109/et.2019.8878490","DOIUrl":"https://doi.org/10.1109/et.2019.8878490","url":null,"abstract":"In the current paper an optimization of bidirectional converter for electric vehicles applications is proposed. A mathematical model of the DC/DC converter is described. The simulations are realized in MATLAB/Simulink. The optimization of the value of the passive components is the main purposes of this research.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"325 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114049006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents the design and development of a multichannel LoRaWAN gateway, based on Raspberry Pi 3 model B+ and IC880A-SPI modules. LoRaWAN provides energy-efficient low-power (Low Power, Wide Area – LPWA) communication for wireless-connected devices (nodes) on regional, national or global networks. This technology is gaining increasing popularity and application in Internet of Things (IoT) and Industry 4.0. This publication is devoted to creating a practical model with educational purposes for testing and developing smart communication applications.
本文介绍了基于树莓派3型号B+和IC880A-SPI模块的多通道LoRaWAN网关的设计与开发。LoRaWAN为区域、国家或全球网络上的无线连接设备(节点)提供节能的低功耗(Low Power, Wide Area - LPWA)通信。该技术在物联网(IoT)和工业4.0中越来越受欢迎和应用。本出版物致力于为测试和开发智能通信应用程序创建具有教育目的的实用模型。
{"title":"Development of Multichannel LoRaWAN Gateway for Educational Applications in Low-Power Wireless Communications","authors":"N. Manchev, K. Angelov, P. Kogias, S. Sadinov","doi":"10.1109/ET.2019.8878492","DOIUrl":"https://doi.org/10.1109/ET.2019.8878492","url":null,"abstract":"This paper presents the design and development of a multichannel LoRaWAN gateway, based on Raspberry Pi 3 model B+ and IC880A-SPI modules. LoRaWAN provides energy-efficient low-power (Low Power, Wide Area – LPWA) communication for wireless-connected devices (nodes) on regional, national or global networks. This technology is gaining increasing popularity and application in Internet of Things (IoT) and Industry 4.0. This publication is devoted to creating a practical model with educational purposes for testing and developing smart communication applications.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114094090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper describes the pilot tests of a demonstrator of telematics-based course on microelectronics with 4th year students in at the Technical University of Sofia. It was developed within the Multimedia Optimization and Demonstration for Education in Microelectronics project developed by eleven European universities and research centers. In the demonstrator’s tests two new techniques for evaluation of telematics-based distance learning: records of textual and graphical communication files, and ‘teleobservation’.
{"title":"Evaluation of Multimedia Learning Materials in Microelectronics","authors":"S. Tzanova, R. Radonov","doi":"10.1109/ET.2019.8878501","DOIUrl":"https://doi.org/10.1109/ET.2019.8878501","url":null,"abstract":"This paper describes the pilot tests of a demonstrator of telematics-based course on microelectronics with 4th year students in at the Technical University of Sofia. It was developed within the Multimedia Optimization and Demonstration for Education in Microelectronics project developed by eleven European universities and research centers. In the demonstrator’s tests two new techniques for evaluation of telematics-based distance learning: records of textual and graphical communication files, and ‘teleobservation’.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121922844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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