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Volume 5, Issue 10, October – 2020International Journal of Innovative Science and Research TechnologyISSN No:-2456-2165Monitoring System for Temperature and HumidityMeasurement with DHT11 Sensor Using NodeMCU1.Muhammad Syahputra NovelanScience and Technology Faculty University PembangunanPanca Budi Medan, IndonesiaAbstract:- Temperature and humidity are importantvariables to determine changes in the state of a substanceor object. By knowing the change in temperature, we canknow the direction of the physical change. Therefore, it isvery important to monitor changes in temperature andhumidity in a system. To fulfill various needs, varioussensors were developed. Therefore, it is very important tomonitor changes in temperature and humidity in asystem. To fulfill various needs, various sensors weredeveloped. In this study, the authors use the NodeMCUmicrocontroller development board as a control centerthat connects to wifi communication. DHT11 temperatureand humidity sensor which functions as a temperaturegauge of 4 objects in turn, namely the temperature of theice cubes, temperature of water heated by electric waterheater and temperature of electric solder neck.Measurements are made in contact with a maximumdistance of 0.4 cm from the object. The results of theDHT11 temperature sensor readings will be continued bysending real time information every second with units of C which can be seen using the visual basic netapplication, which is desktop-based for monitoring datawith communication via wifi that is running well andstable. Temperature and humidity measurement data canbe stored through an online database, namely firebase.Because sensor data is stored by NodeMCU to theFirebase Real-time Database, the VB Application canaccess it anytime and anywhere.Keywords;- Sensor DHT11, NodeMCU, Visual Basic Net,Firebase, Wiifi.I.INTRODUCTIONTemperature and humidity are important variables todetermine changes in the state of a substance or object. Byknowing changes in temperature and humidity, we can knowthe direction of physical change. Therefore, it is veryimportant to monitor changes in temperature and humidity ina system. Monitoring temperature and humidity is veryimportant, especially in the industrial sector, therefore thereare several ways to monitor temperature and humidity.[4]One way to monitor changes in temperature andhumidity requires a DHT11 device or sensor. By using thissensor, users can monitor the temperature and humidity of anobject remotely. So that users can monitor a dangerous objectwithout having to be close together. The advantage of thisIJISRT20OCT1422.Muhammad AminScience and Technology Faculty University PembangunanPanca Budi Medan, Indonesiasensor is that it is sensitive to changes in temperature andhumidity every second that can be seen in real time. [4]Based on this, the author wants to create a monitoringsystem for measuring temperature and humidity remotelyusing temperature and humidity sensors to make it easier forusers to monitor the temperature of an object remotely. Thistool system is based on the NodeMCU microcontrollerdevelopment board as a control center as well as a DHT11sensor as a tool for measuring temperature and humidity aswell as data. The results of DHT11 temperature and humiditysensor readings will be continued by sending real timeinformation every second with C units which can be seenusing a visual application. basic net which is desktop-basedfor monitoring data with communication via wifi that isrunning well and stable. Temperature and humiditymeasurement data can be stored through an online database,namely firebase. Because the sensor data is stored byNodeMCU to the Firebase Real-time Database, then the VBapplication can access it anytime and anywhere. [6].II.LITERATURE REVIEWA. MonitoringMonitoring (Indonesian: monitoring) is monitoringwhich can be described as awareness of what one wants toknow, high-level monitoring is undertaken in order to makemeasurements over time that indicate movement toward oraway from it. Monitoring will provide information about thestatus and the tendency that the completed measurements andevaluations are repeated over time, monitoring is generallycarried out for a specific purpose, to check against thefollowing process objects or to evaluate conditions or progresstowards management outcomes objectives for the effects ofactions of some type including actions to maintain ongoingmanagement.[2]B. Modul NodeMCU ESP8266NodeMCU is an electronic board based on the ESP8266chip with the ability to carry out microcontroller functions andalso an internet connection (WiFi). There are several I / Opins so that they can be developed into a monitoring andcontrolling application for the IOT project. The ESP8266NodeMCU can be programmed with the Arduino compiler,using the Arduino IDE. The physical form of NodeMCUESP8266, there is a USB port (mini USB) so that it will makeprogramming easier. NodeMCU ESP8266 is a developmentderivative module of the ESP8266 family of IoT (Internet ofThings) platform modules of type ESP-12. In function, thiswww.ijisrt.com123

Volume 5, Issue 10, October – 2020International Journal of Innovative Science and Research TechnologyISSN No:-2456-2165module is almost similar to the Arduino platform module, butwhat makes it different is that it is devoted to “Connected tothe Internet “.[6]provides hosting for static files with CND and SNLfacilities.[8]III.C. SensorSensor is a tool for detecting / measuring something,which is used to change mechanical, magnetic, and thermalvariations, rays and chemistry become voltage and electriccurrent. In the environment of control systems and robotics,sensors provide similarities that resemble eyes, hearing, nose,tongue which will then be processed by the controller as thebrain.[5]A. Research StagesIn general, the stages of the entire study are as follows:Describing the ProblemAnalyzing ProblemsD. Sensor DHT11Sensor DHT11 is a sensor with digital signal calibrationthat is able to provide temperature and humidity information.This sensor is classified as a component that has a very goodlevel of stability, especially when coupled with the ATmega8microcontroller capability. Highest quality product, fastreading response, and anti-interference capability, at anaffordable price. DHT11 has a very accurate calibrationfeature. This calibration coefficient is stored in the OTPprogram memory, so that when the internal sensor detectssomething temperature or humidity, this module reads thesensor coefficient. Small size, with signal transmission up to20 meters, making this product suitable for manyapplications. Air humidity describes the moisture content inthe air which can be expressed as absolute humidity, relativehumidity and water vapor pressure deficit. Relative humidityis the comparison between the actual water vapor content orpressure with the saturation state or the air capacity toaccommodate water vapor. Electronic equipment can alsorust easily if the air around it is high enough humidity.Therefore, Information about the humidity in a certain areabecomes something important to know because of the effectsit causes. Information about the humidity value obtainedfrom the measurement process. The tool usually used tomeasure air humidity is a hygrometer. DHT11 is a digitalsensor that can measure the temperature and humidity of thesurrounding air. This sensor is very easy to use withRaspberries. Has a very good level of stability and features avery accurate calibration. The calibration coefficient is storedin the OTP program memory, so that when the internal sensordetects something, then this module balances the coefficientsin its calculations.[4]E. FirebaseFirebase is a realtime database service provider andbackend as a service. An application that allows developersto create APIs to be synced for different clients and stored inthe Firebase cloud. Firebase has many libraries that make itpossible to integrate this service with Android, Ios, Javacript,Java, Objective-C and Node.JS. Firebase databases are alsoaccessible via the REST API. The REST API uses theServer-Sent Event protocol by establishing an HTTPconnection to receive push notifications from the server.Developers use the REST API for subsequent data postsFirebase client library that has been implemented in anapplication that is built which will retrieve data in realtime.Developers can also use this database to secure data using theFirebase server with existing rules. For hosting files, FirebaseIJISRT20OCT142METHODOLOGYSetting GoalsStudying the literature related to the titleData collectionSystem planningProgram StructureSystem AnalysisProgram ResultsFig 1:- Research Stages Describe the ProblemDescribing the problem clearly will help in designingand making a temperature and humidity monitoring systemtool that will be studied must be described in advance,because without being able to describe the problem, determineand define the boundaries of the problem to be studied, thenthere will never be a single best solution of the problem. Sothis step is the most important first step in this research. Problem AnalysisThe problem analysis step is a step to understand aproblem whose scope or boundaries have been determined.By analyzing the predetermined problem, it is hoped that theproblem can be understood well.www.ijisrt.com124