scholarly journals RANCANG BANGUN PEREKAM DATA KELEMBABAN RELATIF DAN SUHU UDARA BERBASIS MIKROKONTROLER

2017 ◽  
Vol 1 (1) ◽  
pp. 73-79
Author(s):  
Acta Withamana ◽  
Indra Jaya ◽  
Ayi Rachmat

Kelembaban relatif (RH) dan suhu udara merupakan salah satu parameter yang penting dalam pengukuran meteorologi. Pengukuran kedua parameter secara kontinyu diperlukan dalam bidang perikanan dan kelautan. Sebuah perekam data untuk keperluan ini perlu dikembangkan. Perekam data disusun atas mikrokontroler ATmega32 dengan clock 8Mhz, Real-time clock (RTC) DS1307, Sensor kelembaban relatif dan suhu udara Sensirion SHT11, soket SD card, Low-dropout (LDO) Linear Regulator LP2950 dan AIC1734. Selain itu dibutuhkan LED dan beberapa komponen pasif seperti resistor serta kapasitor. Perangkat lunak atau biasa disebut firmware pada alat perekam data ini ditulis dengan menggunakan bahasa BASIC. Program yang digunakan adalah BASCOM-AVR versi 1.11.9.0. Hasil uji coba skala lapangan menunjukan selisih terbesar RH sebesar -20,4% dan suhu udara sebesar 7,3ºC yang disebabkan oleh masuknya kontaminan dan desain PCB dan casing yang tidak melepas panas dengan baik

Irriga ◽  
2017 ◽  
Vol 1 (1) ◽  
pp. 11-20
Author(s):  
Luiz Eduardo Vieira de Arruda ◽  
VLADIMIR BATISTA FIGUEIRÊDO ◽  
SÉRGIO LUIZ AGUILAR LEVIEN ◽  
JOSÉ FRANCISMAR DE MEDEIROS

DESENVOLVIMENTO DE UM TENSIÔMETRO DIGITAL COM SISTEMA DE AQUISIÇÃO E ARMAZENAMENTO DE DADOS LUIZ EDUARDO VIEIRA DE ARRUDA1; VLADIMIR BATISTA FIGUEIRÊDO2; SÉRGIO LUIZ AGUILAR LEVIEN3 E JOSÉ FRANCISMAR DE MEDEIROS4 1Mestre, Doutorando do Programa de Pós Graduação em Manejo de Solo e Água (PPGMSA), bolsista da CAPES; Universidade Federal Rural do Semi-Árido (UFERSA); Av. Francisco Mota, 572; Bairro Costa e Silva; 59.625-900, Mossoró/RN; e-mail: [email protected] de Ciências Ambientais e Tecnológicas (DCAT), UFERSA, Av. Francisco Mota, 572; Bairro Costa e Silva; 59.625-900, Mossoró, RN; e-mail: [email protected]; [email protected]; [email protected]  1 RESUMO Para um bom manejo da água na agricultura faz-se necessário a utilização de instrumentos que auxiliem o agricultor na tomada de decisão, indicando quanto e quando se deve aplicar água às culturas. Em face do exposto, notou-se a necessidade do desenvolvimento de um tensiômetro com sistema de aquisição e armazenamento de dados de forma contínua a baixo custo. O modelo proposto é composto por: cápsula porosa (25 x 11 mm), hastes de acrílico transparente com diâmetros de 12 e 15 mm, tampa de borracha siliconada, mangueira plástica transparente, mangueira de borracha e transdutores de tensão modelo Motorola® MPX 5100AP. Para a construção do sistema de aquisição dos dados foi utilizado uma placa Arduino® modelo MEGA 2560, três capacitores, placa fenolítica, bornes, jumpers, cabo quatro vias, RTC (Real Time Clock) modelo DS1307, display de cristal líquido (16 x 2), módulo de cartão de memória SD card, fonte de computador bivolt para alimentação de todo sistema com tensão de 12 Vcc e caixa plástica para acondicionamento dos circuitos. Como resultado da calibração do transdutor de tensão obteve-se uma equação com R2 igual a 0,9996, apresentando ótimo ajuste de acordo com o valor obtido. Palavras-chave: Arduino, transdutor de tensão, tensão de água no solo  ARRUDA, L. E. V.; FIGUEIRÊDO, V. B.; LEVIEN, S. L. A.; MEDEIROS, J. F.DEVELOPMENT OF A DIGITAL SOIL TENSIOMETER WITH A SYSTEM FOR INPUTTING AND STORING DATA  2 ABSTRACT In order to have a good water management in agricultural processes, it is necessary to use instruments that will assist the farmer in the decision-making processes, indicating how much and when to apply water to the crops. Considering the aforementioned, it was noted the demand of development of a tensiometer in conjunction with a data storage and input system, inputting and storing data continuously and at low cost. The proposed model consists of a porous capsule (25 x 11 mm), clear acrylic tube with diameters of 12 and 15 mm, a silicone rubber cap, a clear plastic hose, a rubber hose and voltage transducers Motorola® MPX5100AP model. In order to create the data system used an Arduino® platform model MEGA 2560, three capacitors, a phenolic sheet, terminals, jumpers, a four-way cable, a Real Time Clock (RTC) model DS1307, a liquid crystal display (16 x 2), a Micro SD memory card module, a dual voltage computer to supply power to the whole system using 12 Vcc voltage and plastic housing to store the circuit. The voltage transducer calibration resulted in an equation meaning that R2 is equal to 0.9996, thus presenting an optimal adjustment according to the obtained value. Keywords: Arduino, voltage transducer, soil water tension


2018 ◽  
Vol 18 (1) ◽  
pp. 75-82
Author(s):  
Subandi Saputra ◽  
Aswardi Aswardi

This paper aims to update the conventional attendance system. The focus of this final assignment is: (1) Creating an electronic attendance machine with biometric sensor based on Microcontroller Atmega328, (2) Renewing conventional attendance method into digital absence, and (3) Determining employee performance based on absenteeism. In making of this final task, the writer uses microcontroller atmega328 as main control center, fingerprint reader as main input, LCD as time information viewer on real time clock circuit, and series of SD card module as database system used to store information at the time of absences. Based on the results of the testing of the design of electronic attendance based on atmega328 microcontroller is as follows, the first can be used as a substitute for conventional absorption taking system. This is because the tool is equipped with fingerprint reader sensor so that in absenteeism cannot be represented. In addition, this tool also has been equipped with RTC as a timer system that will record the delay of each user on this tool. the second process of taking attendance (reviewer) can only be done after the user perform the registration process.  


2020 ◽  
Vol 14 (2) ◽  
pp. 14
Author(s):  
Muhammad Sahri ◽  
Misbah Misbah ◽  
Hendra Ari Winarno

Gas merupakan suatu besaran yang mudah berubah-ubah. Oleh karena itu pengukuran dan pengamatan yang berulang-ulang yang hasilnya disimpan untuk dikaji lebih lanjut perlu dilakukan. Pendataan dan pengamatan tersebut masih banyak yang dilakukan secara manual yang kenyataannya memiliki kelemahan-kelemahan diantaranya adalah banyaknya waktu yang diperlukan untuk melakukan pendataan dan pengamatan, kepresisian hasil pendataan, dan teknik pengambilan data masih bisa diragukan.Sebagai jalan keluar dari permasalahan tersebut maka dibuat data logger Gas CO dan NO yang dapat menyimpan data secara otomatis agar dapat mengetahui perkembangan polutan udara. Sistem data logger Gas CO dan NO ini menggunakan sensor Gas TGS 2201 yang akan aktif bila terdapat gas CO dan NO di lingkungan tertentu. RTC (Real Time Clock) untuk menentukan waktu terdeteksinya gas CO dan NO. Memori SD/MMC (Multimedia Card) untuk menyimpan data yang di hasilkan oleh sensor Gas. Data yang tersimpan didalam SD Card dapat dibaca pada komputer menggunakan card reder dengan output excel.Berdasarkan penelitian yang dilakukan sistem data logger berguna menyimpan data RTC dan gas CO,NO. Dimana kapasitas memori SD Card 8GB, sebagai penyimpan data 70KB perhari, interval pengambilan data 1 menit sekali yang dapat digunakan selama 120 hari.


When transporting the goods from one place to another place the components should work perfectly according to our application. This project shows you how to get temperature and humidity values for particular components which are kept in a certain room or area or during the shifting process along with the real time clock. Sometimes due to room temperatures also we can observe a change in the component readings. So in that cases, data logger systems will be helpful. Here we are measuring various weather parameters like temperature, humidity, time and date. For this we require sensors for getting temperature and humidity values and a real time clock is used to get real time. We can retain previous values also by using previous records. Finally, we can display these parameters on the LCD display and save the records so that we can access the previous records. For this storage we can use controller memory or else externally we can connect the memory called SD-card.


2011 ◽  
Vol 103 ◽  
pp. 583-586
Author(s):  
Feng Ling Li ◽  
Jian Hua Rong ◽  
Yu Ping Zhang

Measuring rock stratum displacement in dam grouting process is very important. A new displacement system is designed, comprising a programmable microcontroller Atmega16, a new grating capacitive displacement sensor(GCDS), DS1302 real time clock chip and announciator etc. The system has high sampling rate of 9600 baud rate and can trap the displacement equal to 0.001 millimeter in one second. Equipped with mechanical conveyance system, the system can be applied to the civil engineer. The experiment results show the instrument can measure accurately the displacement value and alarm geologic disaster in time, which can conduct continuous and accurate monitoring and provide operation decisions for dam engineers.


2014 ◽  
pp. 329-347
Author(s):  
Warren W. Gay
Keyword(s):  

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