Abstract: In this paper we present the design and construction of a Automatic room lights controller with visitor Counter . This a reliable circuit that takes over the task of counting number of persons / visitors in the room very accurately and displays the actual number of people on the LCD and beeps a warning alarm when the number of visitors exceeds the capacity limit of the auditorium/hall and displays a warning message on the LCD. This avoids the congestion of people in a room/hall/auditorium which is a need in the present pandemic situation due to COVID-19. We have also implemented the circuit to control and monitor all electrical equipment's or appliances in the room/hall automatically based on the presence of the people present by the use of the Arduino has a main controller .The fan’s speed is regulated according to the temperature in the room .If no one is present in the room the fans and lights are switched off automatically. By this we avoid the intervention of human/person to control electrical appliances like light bulbs, fans etc. manually. Here IR sensors are used to identify entry and exist of the people. This automation will save lots of electricity and economically cost effective to implement it.

Keywords: Arduino Uno, IR Sensors, Fan, LCD, light bulbs.

| DOI: 10.17148/IARJSET.2021.8726