International Journal of Science and Research (IJSR), India Online ISSN: 2319-7064 Volume 2 Issue 9, September 2013 www.ijsr.net Design an Automatic Temperature Control System for Smart Electric Fan Using PIC Zairi Ismael Rizman 1 , Kim Ho Yeap 2 , Nuraiza Ismail 3 , Norizan Mohamad 4 , Nur Hafizah Rabi’ah Husin 5 1 Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM) Terengganu, 23000 Dungun, Terengganu, Malaysia 2 Faculty of Engineering and Green Technology, Tunku Abdul Rahman University, Jln. Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia 3 Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM) Terengganu, 23000 Dungun, Terengganu, Malaysia 4 Faculty of Computer and Mathematical Sciences, Universiti Teknologi MARA (UiTM) Terengganu, 23000 Dungun, Terengganu, Malaysia 5 Academy of Language Studies, Universiti Teknologi MARA (UiTM) Terengganu, 23000 Dungun, Terengganu, Malaysia Abstract: This paper presents an innovative prototype design of electric fan with smart characteristics. This electric fan uses a microcontroller to produce an automation function. It also has a unique double feature designs, such as using 2 fans, 2 Light Emitting Diodes (LED) and 2 sensors. This is to ensure the cooling process operates more efficiently and effectively, especially for a large space application and in hot weather due to global warming. By applying the circuit, it offers a better life for human. It is really practical for senior citizens to make their life simpler. The circuit is also suitable for disabled people who have difficulty to switch on the fan manually. Lastly, the circuit can be manipulated by diversifying its function as a detector, where it can produce an alarm signal when emergency case occurs such as the house or premise is on fire. Keywords: Automatic, Temperature, Fan, PIC. 1. Introduction Electric fan is one of the most popular electrical appliances due to its cost effectiveness and low power consumption advantages [1]. It is a common circuit and widely used in many applications [2]. It is also one of the most sensible solutions to offer a comfortable and energy efficient. In fact, the fan has been long used and still available in the market. Nowadays, the usage of fan is controlled manually by pressing on the switch button. This non-innovative feature makes it unable to turn on automatically according to temperature changes. So, an automatic temperature control system technology is applied for the switching purpose in this circuit. Due to its advantages, many researches focusing on automatic temperature control system application in different fields will gain the benefits. For examples, an automatic temperature controller for multielement array hyperthermia systems [3], multi-loop automatic temperature control system design for fluid dynamics [4], automatic temperature control for transport airplanes [5], design of automatic temperature control system on laser diode of erbium-doped fiber source [6], design of automatic- temperature-control circuit module in tunnel microwave heating system [7], development of automatic temperature control system in blast furnace [8], the automatic temperature system with Fuzzy self-adaptive Proportional- Integral-Derivative (PID) control in semiconductor laser [9], the constant temperature automatic control system design of 3G base station without man' s guard [10], automatic body temperature control system for small animal studies using dual mode Proportional-Integral (PI) control [11], automatic temperature and humidity control system using air- conditioning in transformer substation [12] and so forth. There is also a case study of automatic temperature control system on diagnosable discrete event system design [13]. This paper proposes an invention of Smart Electric Fan for various applications. It has an automation operation by using a microcontroller. It uses a unique design such as 2 fans, 2 LEDs and 2 temperature sensors. This is to enhance its functionality to become more efficient and effective for large space and hot weather condition. The circuit provides a comfort for human’s life, especially for senior citizens. It really helps to solve the problem of handicapped person when to switch on the fan. Finally, the circuit can also detect when fire occurs by alarming the buzzer. 2. Methodology The circuit presents the design, construction, development and control of automatic switching electric fan. The idea is based on the problem occurs in human’s life nowadays by improving the existing technology. The Peripheral Interface Controller (PIC) based automatic fan system is applied to upgrade the functionality to embed automation feature. The electric fan will automatically switch on according to the environmental temperature changes. The circuit is using a microcontroller to control the fan according to the temperature variation. The system measures the temperature from the Integrated Circuit (IC) LM35, where it will control the fan according to the setting values in the programming. Paper ID: 21081301 1