Abstract. One of the important aspect in creating a comfortable and safety working or living
environment is when all supporting electronic equipment can be controlled according
to user desires and needs. Home, room or building can be a pleasant environment for doing
activities by providing the comfort of the work environment beforehand. Therefore, a reliable
IoT-based smart home system was designed to help users or managers to control the room
or office so that the comfort and safety aspects was maintained. The IoT system built using a
MCU Node Microcontroller allowed the room electronic equipment to be controlled.
While the control interface was embedded in the smartphone. The research design used
Research and Development (R&D) with Waterfall model. Meanwhile, the testing system used
functionality testing and performance testing. The test results showed that all the functions of
the system designed could run well. Meanwhile, the performance testing showed very effective
result. Based on the test results, it can be concluded that the smart room system can be
applied.
Key Words: Comfortable and Safe Work Environment, Smart Room, IoT System, Node MCU
