Telemedicine for silent hypoxia: Improving the reliability and accuracy of Max30100-based system

<span lang="EN-US">This study aims to design, assess, and improve the reliability of the telemedicine-based system for examination and monitoring of the symptoms of silent hypoxia–an extraordinary symptom of COVID-19. We design a telemedicine system for heart rate and oxygen saturation measurement which consists of a photoplethysmograph Max30100 sensor, NodeMCU microcontroller, real-time clock module, firebase realtime database, and Android-based mobile application. The designed system is tested through a comparative test with a commercially available oximeter. A total of 85 experiments from 40 participants in two different positions were conducted. Our analysis shows the accuracy rate of the Max30100 measurement is 97.11% and 98.84%, for heart rate and oxygen saturation (SpO₂), respectively. Bland Altman was used to appraising and visualizing the agreement between the two measurement devices. We further apply calibration to improve the accuracy of the collected data through linear regression, which reveals 97.14% and 99% accuracy data for heart rate and SpO₂, respectively. Finally, a series of end-to-end remote testing is successfully conducted representing the real-life scenario of the telemedicine system. Overall, the designed system attains a reliable option for a telemedicine-based system for examination of the symptoms of silent hypoxia.</span>

Clock synchronization in distributed multicomputer systems. Part I

The study substantiates the necessity of clock synchronization in distributed multicomputer systems. The basic definitions related to the concept of clock synchronization are given, and methods of clock synchronization are classified. Increasing the lifecycle of failure- and fault-tolerant distributed multicomputer systems for critical application is one of the most urgent problems at the current level of technology development. This is especially true for unattended distributed multicomputer systems for space applications. The development of such systems should begin with the construction of models of faults and self-controlled degradation, ensuring, firstly, their failure and fault tolerance and, secondly, maximum survivability, which is possible only if there are means of clock synchronization in such systems. All activities associated with ensuring the synchronization of any distributed multicomputer systems begin with the concept of synchronization of on-board functions, which is based on the generation of on-board time and includes the synchronization of on-board software and equipment that requires time synchronization or information about the course of time. The main elements of this concept are the processor clock module, the onboard software clock, the atomic navigation clock. The first part of the work gives basic definitions, and considers methods and algorithms related to the clock synchronization process. The second part is devoted to synchronization in systems with Byzantine faults and in multi-cluster and multi-complex, i.e. multitask, systems. The modern technologies providing the synchronization process in such systems are considered.

Charter Authenticated Anti-Theft Secure Motor System

The prominent mode of transportation being used by the public is roadways. Increased usage of roadways may lead to many accidents and thefts. The major reason is violation of rules drafted for driving and causing accidents mainly by the youngsters who does not have a proper knowledge and license. So this proposed system has some restrictions to follow the rules drafted for driving and for higher safe and security, the License is scanned by means of NFC tag. When it is read by the NFC reader, Node MCU provides two-way authentication facility by sending an SMS to both the owner for authorization and the authorized current user would be able to control our vehicle by means of switching on and off the engine. The owner authorizes the user for a particular time period by using real time clock module. Without authorizing the license, the engine cannot have turned on. So, in this case license become mandatory to drive the vehicle. The features of the application to control the vehicle through the attached device. This will help a person to control the vehicle from anywhere. If a robber tries to snip the vehicle, immediately the Micro-Electromechanical System sends a signal to the controller and will be notified by a text message. Any violation to unlock the vehicle, emergency alert will send to owner as well as the current user and alarm blows out to seek the attention. This device can setup both in two-wheeler and four-wheeler.

Design and Application of Modular Transportation Status Monitoring System

In this paper, combined with the actual engineering, a modular transportation status monitoring system is designed, which can be used to measure environmental conditions such as vibration, inclination, temperature and humidity during the process of transportation. The system consists of a main control module, a storage module, a data acquisition module, a real-time clock module, a power management module and an alarm module. The design scheme has high development efficiency and strong practicability. The measurement device used in the experiment for environmental monitoring during transportation process performs well, and can be a typical application case of innovative practice teaching

DEVELOPING AN AUTOMATED CONTROLLER FOR A SOLAR HEATING SYSTEM

The paper discusses the development of an automated controller for a Mojo v3-based solar heating system. The developed system operates using 6 sensors (DS18B20 Dallas) expanding the platform's applicability. An in-tegrated system allows controlling temperature and heat using Dallas sensors. The control and monitoring system is implemented in the VHDL and VERILOG languages. A control algorithm has been developed that activates libraries and constants, a real-time clock module, temperature sensors, and server connection. When the server connection is established, the temperature sensor readings are recorded and saved in the XML file in the Ethernet module. XML facilitates data processing by automatically or manually interpreting spreadsheet programs.

Diseño y construcción de un sistema automatizado de control de bombas de agua en un cultivo hidropónico en el entorno Arduino, UNSCH – Ayacucho

The objective of the work to develop an automated irrigation system about Arduino for hydroponic crops The system uses an Arduino ATmega328P board to connect different components, such as a real-time clock module, LCD I2c screen, two one-channel relay modules and electrical resistors; For the purpose to obtain a micro programmable controller that turns on and off the water pump of a greenhouse in times determined according to the development of the crop, particularly in lettuce crops with different varieties .For this, it’s necessary to use different control techniques and to carry out several experimental tests in order to adjust certain control parameters, especially humidity and temperature. This system was installed in the greenhouse of the Community of Mollepata in Ayacucho, within the three-year agreement "Inti, the energy that feeds the Earth" between the National University of San Cristóbal de Huamanga (UNSCH) and the Regional Committee of Education for Development Lanaudière International (CREDIL – JOLIETTE) - Canada.

Alat Monitoring Radiasi Matahari di Pulau Batam

Photovoltaics (PV) cell adalah sebuah elemen yang dapat melakukan konversi energi dari radiasi akibat panas matahari menjadi energi listrik dengan prinsip semikonduktor. Tegangan dan arus listrik yang dihasilkan sel surya dipengaruhi oleh tingkat intensitas radiasi cahaya matahari dan temperatur udara lingkungan. Alat yang dibuat dalam penelitian ini didesain dengan menggunakan metode lookup table yang dibuat dengan memakai 2 motor sebagai penggerak sumbu x dan y dalam menentukan koordinat dari posisi matahari yang digunakan sebagai penentu intensitas radiasi matahari di Pulau Batam. Perangkat ini juga terintegrasi dengan waktu menggunakan real time clock module.

Wearable smart device incorporating real-time clock module and alcohol sensor

<p>In this work, we designed and built a wearable device with battery-saving and alcohol-sensing functions. The motivation for this device was to deliver a proof-of-concept wearable and functional device which alerts the user of possible alcohol breath level above a threshold limit and can be worn for an extended time due to battery saving features. It was built using a combination of Arduino electronics and sensors, and encased in 3D-printed ABS bracelet. A 4-digit 7-segment LED display on board is used to display time which is tracked using a real-time clock module. A 3-axis accelerometer determines the orientation of the device and activates the display only when it is held in a specific orientation by the user. An example is when two axes are normal to the gravitational pull while a single axis is in line with gravity to simulate users raising their arm parallel to the ground. A slight tolerance in the setting ensures that the threshold for activation is not overly strict. This will ensure that the LED display is activated over a narrow range of orientations. The alcohol sensor is sensitive to alcohol content in the air. The threshold for detection can be changed and calibrated to the user specific needs. The alcohol sensor is slightly sensitive to humidity and very sensitive to alcohol. It has been tested with ethanol, wine and beer with 95%, 12.5% and 4.55% alcohol content, respectively. Because the alcohol sensor works by using a resistor that continuously pulls current and detects changes in resistivity due to adsorption of alcohol molecules, it consumes a lot of power when turned on continuously. In order to conserve power, the sensor can be activated only when the device is oriented in a specific position or when the user pushes a button. An Arduino Nano board is used to reduce the overall size of the device. It is powered using an external 5V battery via a mini-USB connector. In order to reduce the number of IO pins used, the RTC, LED and accelerometer were configured to use I2C interface connections. A default SCL clock speed of 100 kHz is used and the component IOs are connected to a common SDA line which terminates at one analog pin. In normal operation, the RTC is configured to read time continuously at one second interval. It is preprogramed with the correct date and time prior to operation of the device.</p>