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One of the benefits in using the trendy Internet of Things is an online monitoring and control system. This system is able to integrate all needs between electrical equipment and its users remotely and wirelessly. One of the uses of this system is for the residential sector. Where in this sector, the optimum environmental conditions are very needed for the human convenient when they are doing activities. This article discusses the design of an environmental condition monitoring system in a room of a house or office building. This system measures several parameters of environmental condition such as temperature, humidity, lighting level and noise level. The measurements use many sensors for each parameter and Analog to Digital Converter (ADC) ADS1115. The measurement data then being processed by The NodeMCU ESP8266. In this system, The NodeMCU Board is used as a server, and the processed data will be sent to server on a real-time web page. The client can be a computer, smartphone, or mini-computer (such as Raspberyy Pi) device that display the monitoring interface in the browser. The connection between these devices is a wireless network. The monitoring system showed successfully operated with a web-based and attractive interface. The results of reading the room parameters had accuracy of more than 94%. In addition, the measured parameters will be stored by the client device in the form of a file. Saved files can be used for further analysis of the condition of the room.