This paper presents the design and development of a RFID based Room Automation using microcontroller. This paper has shown the concept of an automatic Door Access System with Automatic Room Light Controller and Visitor Counter. The concept of access control is brought about using a card, a corresponding card reader and a control panel. The card is a proximity card with a unique identification number integrated in it. The reader reads the data and sends it to the control panel. This controller checks whether he/she is allowed to enter the particular door or not. If the employee is authentic, then he/she is allowed access in the particular entrance. Automatic Room Light Controller with Visitor Counter using Microcontroller is a reliable circuit that takes over the task of controlling the room lights as well as counting number of persons/ visitors in the room very accurately.