The model discussed here is a bidirectional visitor counter .The key features described in the model are i) counting number of people entering and exiting a room using an embedded system ii) using the concept of Infra Red sensor modules (TSOP sensor) and servo motors.[1]The embedded system used here is an Arduino Uno board. It is a microcontroller (Atmega328) based board having 14 digital pins (out of which some are PWM pins) and 6 analog pins. The Arduino have been programmed using EMBEDDED C. The detection of people entering or leaving is done by the IR modules. The concept of servo motor has been used for the opening and closing of the gates at the entrance and exit. Finally the entire counting process is done by the arduino and the final number of people inside the room at a particular instant of time is displayed in the serial monitor of the Arduino IDE (Arduino programming Interface) and can be seen using a laptop or personal computer.

Arduino UNO; TSOP IR sensor module; Servo motors; Embedded C Programming

[1] Kadam Shah, Prakash Savaliya and Mitesh Patel, “Automated roomlight controller with bidirectional visitor counter”, IJICTRD – International Journal of ICT Research and Development | Vol-1 Issue-4 | ISSN: 2395-4841
[2] Bader M. O. Al-thobaiti, Iman I. M. Abosolaiman, Mahdi H. M. Alzahrani, Sami H. A. Almalki, Mohamed S. Soliman, “Design and Implementation of a Reliable Wireless Real-Time Home Automation System Based on Arduino Uno Single-Board Microcontroller”, international journal of control, automation and systems vol.3 no.3 july 2014 issn 2165-8277 (print) issn 2165-8285 (online)
[3] Alicia M. Gibb, “New Media art, Design, and The Arduino Microcontroller a Malleable Tool”, A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, February 2010, unpublished.
[4] Chinmay Kulkarni, Suhas Grama, Pramod Gubbi Suresh, Chaitanya Krishna, Joseph Antony, “Surveillance Robot Using Arduino Microcontroller, Android apis and the Internet”, 2014 First International Conference on Systems Informatics, Modelling and Simulation.
[5] Drew Newell “Method for Powering Arduino Microcontroller and Shield using a Battery”, unpublished.
[6] Pavel Vařacha , Nicos Mastorakis , Roman Jašek , Martin Pospíšilík, Bronislav Chramcov , David Sámek, “Technical Devices for Supervising of a Household via Interned Based on Arduino Microcontroller”, unpublished.
[7] Mejdl Safran and Steven Haar, “Arduino and Android Powered Object Tracking Robot”, unpublished
[8] Deepti Malviya, Suman Sharma, “Design And Development Of Walking Bipedal Robot With The Help Of Arduino Controller”, Issn: 2277-9655 (I2or), Publication Impact Factor: 3.785 (ISRA), Impact Factor: 2.114
[9] Rodriguez, K., Crespo, J, Barber, R.,“An android interface for an arduino based robot for teaching in robotics”, The 6th international conference of education, research and innovation, at sevilla.
[10] Justus Beyer, Richard Varbelow, Jan-Niklas Antons , Steffen Zander ,“A Method For Feedback Delay Measurement Using a Low-cost Arduino Microcontroller”, unpublished.