This research is an effort to save on the use of electrical energy at home, by designing and building an automatic room light control system using a PC and an ATmega 328 microcontroller which is used as a module on the Arduino uno. The research method used is a quasi-experimental method by calculating the average time consumption required when using a control system. From the results of the analysis carried out, it was concluded that for each procedure used in the test it produced a very good average response time because it was not more than 1 second and did not cause a long delay in the execution of control commands.
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