A prototype of a low-cost electrocardiogram (ECG) monitoring device has been designed and implemented. We used Texas Instruments TM4C123G LaunchPad as a low-cost ARM Cortex-M4 based microcontroller, ...the AD8232 board as a cost-effective single lead ECG sensor, and Nextion 3.2" touch screen Liquid Crystal Display (LCD) as a monitor. A moving average filter was designed and applied to smooth the signal and get a high-quality ECG signal. Experimental results indicated the feasibility, validity, and reliability of the design.
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Spin coaters are widely used to apply thin films of a material uniformly over a flat substrate. Despite the simplicity of this technique the entry price for such machines might be ...prohibitive, ranging from few hundreds to thousands of Euros. Here we present Maasi, an affordable alternative that is easy to build and has all functional key features to be used in a wide range of applications. Our design has a price of less than hundred Euros and an assembly time of only two hours. One of the key design principles was to use only 3D printed parts in combination with affordable Commercial Off-The-Shelf (COTS) components 1. Reducing the complexity we use an electronic speed controller (ESC) with telemetry, to eliminate the need for a rotor position sensor 2. A touchscreen further improves its usability, thus setting a perfect startpoint for the design of other affordable lab tools. The Maasi project includes different 3D printable substrate holders allowing treatment of formats up to 80 mm in diameter. We furthermore validate the Maasi spin coater by measuring its speed accuracy and performance for coating polydimethylsiloxane (PDMS) on glass coverslips for mechanobiological assays.
El uso de fermentadores es común en diversos procesos biotecnológicos. Actualmente, un fermentador o biorreactor tiene la capacidad de monitorear variables físicas y químicas las cuales son mostradas ...al operador por medio de una pantalla. Aunado a los materiales de construcción de un biorreactor, hoy en día su adquisición es costosa e inaccesible para fines educativos y de investigación. Para abordar esta problemática, se diseñó y desarrolló la interfaz Fermenta V1.0. orientada a la simulación de un bioproceso realizado por un fermentador, para realizarla se utilizó una pantalla táctil Nextion y Arduino UNO; para su programación, se implementaron los entornos de desarrollo integrados apropiados. La interfaz fue capaz de emular diferentes dispositivos electrónicos como sensores, válvulas solenoides, bombas peristálticas, iluminación y agitación. En esta primera etapa, se establece el punto de partida para facilitar el acoplamiento de la interfaz Fermenta V1.0 con diversos sensores orientados al monitoreo de un fermentador. Con la incorporación de los dispositivos electrónicos a la interfaz, se podrá adecuar al sistema (interfaz- sensores) a un proceso biotecnológico en donde se requiera el uso de un fermentador y la necesidad de monitorear temperatura, oxígeno disuelto, pH, CO.sub.2, iluminación, agitación.
The paper describes a system for automatic control of microclimatic factors based on the Arduino platform, whose work and functionalities are shown on the model of the system itself. The Arduino Uno ...is a control unit of the system that, according to the measurements read from the sensors of temperature (DHT22), humidity and soil (YL69) and light intensity (photoresistor/LDR), controls the ventilation, irrigation, lighting and indication of the need for heating. To monitor the measured values from the sensor and set the optimal limits required for higher and better plant yield, a Nextion touch screen was used, with which the user can easily change the optimal limits value according to the needs of the plant culture. The paper explains the technologies used and the necessary components for system design. The connection of each component with the Arduino platform is explained in detail, accompanied by diagrams and the necessary program code for proper operation. Also, the purpose of each sensor and executive elements in terms of the automation system is explained. Finally, the created model of the system is shown with all the associated parts connected into one ensemble and placed in the appropriate places of the system model. Also, testing of the system itself was done to show the purpose and mode of operation to create optimal microclimatic conditions in the protected area. The whole system is designed to be modular, so that it can be upgraded as needed. The very cost-effectiveness of such a system is assessed by the greenhouse user himself, ie, in this case it is valid: if the payback period is less than the specified project life, the investment is acceptable. the shorter the payback period, the more justified the investment. 9 Keywords: arduino platform; automation; Nextion display; control; sensor
In this article, a security system was developed and implemented through a mobile application in
Android Studio that allows the user to activate or deactivate the alarm system, being the main
control ...board implemented in Arduino Mega. In addition, it has a motion sensor that detects if the
bicycle has moved from its initial location. When this happens, the buzzer emits an alert tone, a
call is made and a text message is sent to the owner of the bicycle. This message contains a link
that, when entering it, a map is displayed in the mobile application with the location where the
bicycle is at that moment. For sending messages, phone calls and GPS position, a SHIELD SIM808
is used. As a second option, there is a Nextion screen in which a password is entered that allows the alarm to be activated or deactivated. In addition, a lock opens or closes when the alarm is
activated, immobilizing the rear wheel of the bicycle. By having a self-recharging system, it allows
the user to recharge the battery that feeds the prototype by moving the wheel, for which a dynamo
is used that complements the recharging system with a solar panel, thus having an autonomy of
battery life of approximately 4.59 hours. Through the different tests carried out on the prototype,
such as the accuracy of the GPS system, motion detection in different situations, validation of the
opening and closing of the lock, whether using the mobile application or the password entry and
the reception time of text message and calls, the prototype has an efficiency of 99.17%.
Neste artigo, foi desenvolvido e implementado um sistema de segurança através de um aplicativo
móvel no Android Studio que permite ao usuário ativar ou desativar o sistema de alarme, sendo a
principal placa de controle implementada no Arduino Mega. Além disso, possui um sensor de
movimento que detecta se a bicicleta se deslocou da sua localização inicial. Quando isso acontece,
a campainha emite um tom de alerta, uma ligação é feita e uma mensagem de texto é enviada ao
proprietário da bicicleta. Essa mensagem contém um link que, ao entrar nela, é exibido um mapa
no aplicativo móvel com a localização onde a bicicleta se encontra naquele momento. Para enviar
mensagens, chamadas telefônicas e posição GPS, é utilizado um SHIELD SIM808. Como segunda
opção, há uma tela Nextion na qual é inserida uma senha que permite ativar ou desativar o alarme.
Além disso, uma trava abre ou fecha quando o alarme é acionado, imobilizando a roda traseira da
bicicleta. Por possuir um sistema de auto-recarga, permite ao usuário recarregar a bateria que
alimenta o protótipo movendo a roda, para a qual é utilizado um dínamo que complementa o
sistema de recarga com painel solar, tendo assim uma autonomia de vida útil da bateria de
aproximadamente 4,59 horas. Através dos diferentes testes realizados no protótipo, como a
precisão do sistema GPS, detecção de movimento em diferentes situações, validação da abertura e
fechamento da fechadura, seja usando o aplicativo móvel ou a entrada de senha e o tempo de
recepção de texto mensagens e ligações, o protótipo tem uma eficiência de 99,17%.
En el presente artículo se desarrolló e implementó un sistema de seguridad a través de una aplicación móvil en Android Studio que permite al usuario activar o desactivar el sistema de alarma, siendo la placa de control principal implementada en Arduino Mega. Además, posee un sensor de movimiento que detecta si la bicicleta se ha movido de su ubicación inicial. Cuando esto ocurre, el buzzer emite un tono de alerta, se realiza una llamada y se envía un mensaje de texto al dueño de la bicicleta. Este mensaje contiene un enlace que, al momento de ingresar al mismo, se visualiza un mapa en la aplicación móvil con la ubicación en donde se encuentra la bicicleta en ese momento. Para el envío de mensajes, llamadas telefónicas y la posición del GPS se utiliza un SHIELD SIM808. Como segunda opción se tiene una pantalla Nextion en la cual se digita una contraseña que permite activar o desactivar la alarma. Además, una cerradura se abre o cierra al activarse la alarma, inmovilizando la rueda posterior de la bicicleta. Al poseer un sistema de auto recarga, permite al usuario re-cargar la batería que alimenta al prototipo mediante el movimiento de la rueda, para lo cual se utiliza un dinamo que complementa al sistema de recarga con un panel solar, teniendo así una autonomía de batería de aproximadamente 4,59 horas. A través de las diferentes pruebas realizadas al prototipo como la exactitud del sistema GPS, detección de movimiento ante distintas situaciones, validación de la apertura y cierre de la cerradura, ya se utilizando la aplicación móvil o el ingreso de contraseña y el tiempo de recepción de mensaje de texto y llamadas, el prototipo tiene una eficiencia del 99,17%.
This study was developed on an Internet of Things application, in which experiments were created and applied in a prototype for tests, being this part of a project that includes the validation of ...data during the transmission by sensors, when performing a collection of information in patients. During the research, different types of experiments were performed considering some types of lcd monitors for use with Arduino, in this way the display tft Nextion was selected, because it presented some interesting characteristics that were supported for the project. The results presented the possibility of developing solutions that could contribute to different types of studies, which involve the internet of things.
The main objective of this work is to present the results of an experimental study using the NodeMCU12e devices with Shield, together with the Tft Nextion and the heart rate sensor MAX30102, normally ...these devices are used for projects that involve the Internet of Things (IoT), commonly used to create residential and electronic automation solutions, this project demonstrate how to build a solution for heart rate and pulse monitoring. The use of these resources allows the adequacy and control of patients, as well as for monitoring people who need special care. The results present a solution applicable in prototype format, which can be evolved to more complex models, serving as the basis for the development of more robust solutions and studies.
Wireless monitoring system for photovoltaic (PV) application system was conducted in 1 kWp of a solar power plant in the Electrical Engineering Laboratory, Universitas Jenderal Achmad Yani. ...Photovoltaic performance needs to be monitored per day, month, even yearly, so that the data generated can be used for evaluation and other diagnostic purposes. Online monitoring is widely used for certain needs, in this paper we will discuss real-time monitoring of PV performance based on 3DRobotics Radio 915 MHz monopole antennas to send data actually. The antenna was tested based on 3.5dB gain, resulting in path loss 57.65 dB and the receiver antenna power measurement results were -45.87 dBm. Current and voltage sensors are used to obtain PV power and are processed using a microcontroller, while to measure losses due to environmental factors temperature sensors and light sensors are also used in this system. The current, voltage, power, temperature and level of sunlight displayed by nextion LCD touch screen 4.3 in, this system is equipped with a memory card as a back-up if offline monitoring is more desirable.
The growing development of projects involving studies on the internet of things is the main motivating factor for the creation of studies and research on solutions that allow the improvement of the ...quality of life of the people, as an emerging technology still lacks the scientific materials that can collaborate with new studies. The results of this manuscript contribute to the development of new solutions that serve as the basis of studies for future projects, allowing the understanding of the different types of devices and their applications in more complex projects. The prototype presents an innovation in the use and application of the devices used in IoT projects.
This manuscript presents the results obtained while conducting experiments using projects for the Internet of Things, the NodeMCU12e microcontrollers, were used to perform data transmission with the ...NRF24L01 + device, these devices are commonly used in projects traditional for the Internet of Things, the results are presented in a Nextion touchscreen type display. The results of this study intend to contribute to the construction of more robust projects, which require a data connection in small environments, such as in small hospitals, residences or even in nursing homes, facilitating communication between sensor type devices, providing a better quality of life for the general population. The results demonstrated the ease and capacity of the devices in the data transmission, as well as their low cost of acquisition, allowing the access to the development of different types of projects.
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