Prototype Monitoring Temperature and Humidity Sensor Room Server-Based Internet of Things (IOT) Mohammad Ridwan 1 , Djamaludin 2 , Muhammad Roqib 3 {mridwan@unis.ac.id 1 , djamaludin@unis.ac.id 2 , tofikguntoro@gmail.com 3 } Informatics Engineering Study Program, Islamic University of Sheikh Yusuf Tangerang, St. Maulana Yusuf Tangerang 15118, Indonesia 1,2,3 Abstract, Computer servers are very important to provide resources to be used for computer users in a network. Temperature and humidity in the server room are things that must be addressed to remain in normal, so as to minimize damage to server computer hardware, a system consisting of secure devices and hard devices using a microcontroller consisting of NodeMCU, DHT11 temperature sensor, LCD I2C, temperature & humidity data will be displayed in real-time on the website and also get notifications via e-mail and telegram if the temperature and humidity exceed the normal limit. Keywords: Server, Temperature, Humidity, Microcontroller. 1. Introduction The server is the center for storing data, in which there is a lot of data and information such as databases or other data that can be accessed through the internet network. In this case, the server computer must be considered and maintained the health of the hardware that is in it, because this device continues to be used for a long time and often performs a process that is so heavy that it requires futures maintenance, one of the things that become a parameter that affects the health of a hardware device on a server computer that is temperature and humidity. General temperature and humidity standards for maintaining room temperature According to the American Society of Heating Refrigerating and Air-Conditioning Engineers (ASHRAE) in the Thermal Guidelines (2015), to recommend server room temperatures should not be less than 15 ° C (59 ° F) or more than 32 ° C (89.6 ° F). so the server room temperature is recommended to be at a temperature between 18 ° - 27 ° C (64.4 ° -80.6 ° F) and also humidity ranging from 45% - 55% this can vary under certain conditions. To be able to monitor temperature and humidity on a server that is operating, therefore a system that will be able to provide information directly or often we call it in real-time if there is an instability of temperature and humidity on the server when there is a process that is not going well the system it will send notifications via the internet. Admin can access anywhere the temperature and humidity monitoring system by utilizing the Internet of Things (IoT). 2. Research Methods 2.1. Method of Collecting Data Observation Method, Knowing the temperature and humidity in the server room, and overcome by building a system to be able to increase the temperature and comfort and control the computer server if abnormal temperatures occur with the remote server, Target is observing in the Server Room of the Task Unit of the Management Information System of Islamic University of Sheikh Yusuf. Interview Method, conducted through face to face and question and answer directly with interested parties. Library Study Method, conducted through the collection of literature, journals, articles, and readings that are related to the title of the study as a reference in the preparation of this report. 2.2. System Planning The process of building this system is divided into two parts, namely hardware design and software design user interface. A. Tool Design a. DHT11 Sensor Circuit to NodeMCU ICSET 2019, November 23, Jakarta, Indonesia Copyright © 2020 EAI DOI 10.4108/eai.23-11-2019.2301576