www.iaard.net IAARD Journals eISSN: 2455-3204 International Journal of Computer Science and Information Technology International Journal of Computer Science and Information Technology, 2016, 2(1),8-11 T.Chockalingam et al., Page No.8 Temperature based dc fan speed control system using microcontroller and pulse width modulation technique using PIC16F877A T.Chockalingam 1, Melese Yemane 1 and A.Agasthian 2 1 Ambo University, Ambo, Ethiopia 2 Network Administrator, Annauniversity, Thoothukudi Campus, India [email protected]……………………………………………………………………………………………………………………………………………………… ABSTARCT: Temperature based dc fan speed control system using microcontroller and pulse width modulation technique using PIC16F877A is to control the speed of dc fan speed based on room temperature using pulse width modulation technique with microcontroller. The temperature is read from the temperature feeler and the situation is checked depending on temperature rate. The aim of developing this project is to control the speed of DC fan motor. The main advantage in using a DC fan motor is that the s p e e d -Torque relationship can be varied to almost any useful form. To achieve the speed control an electronic technique called Pulse Width Modulation is used which generates High and Low pulses. These pulses vary the speed in the motor. For the generation of these pulses a microcontroller (PIC 16F877A) is used. As a microcontroller is used setting the speed ranges as per the condition is easy which is done by changing the duty cycles time period in the program. This project is practical and highly feasible in economic point of view, and has an advantage of running motors of higher ratings. This project gives a reliable, strong, exact and efficient way of speed control of a DC fan motor. The simulation of the system has been done on Proteus Professional Software v 8.1. Hardware implementation has been also done. The results of the research and Output waveforms have been investigated. Keywords: Microcontroller, temperature sensor, analog to digital converter, DC Fan, pulse width modulation and speed control. …………………………………………………………………………………………………………………………………… 1. Introduction The aim of this project is to control the speed of dc fan speed based on temperature using pulse width modulation technique with microcontroller. To get rid of the problem of Obscurity to control temperature in industries, public building, apartment house and private house a microcontroller based controller has been proposed. A temperature sensor has been used to measure the temperature of the room and the speed of the fan is varied according to the room temperature using pulse width modulation technique. Controller is used to control the speed of DC Fan and temperature is varied through the Temperature sensor and data is sent to PIC 16F877A microcontroller using analog to digital converter. The duty cycle has been varied from 0 to 100% to control the fan speed depending up on the room temperature, which is displayed on liquid crystal display. Duty cycle values between 20% and 90% allow smooth control of the fan. Out of various control techniques available only two of them can be used to control DC motor. They are sensor control and sensor less control. With the improvement in machinery, smart systems are being introduced every day. In the present time microcontrollers play a vital role in the development of the smart systems. It is to be noted that dc motor is not directly connected with microcontroller because a micro controller can’t supply the current for the working of DC motor. An independent control system which responses on the ambience conditions. The idea behind this project is to control the speed of DC fan using microcontroller based on variation in temperature. Temperature controlled fan is an alternative way to deal with the speed of the motor. Temperature control is a process in which the temperature of an object is measured and the passage of heat energy into or out of the object is adjusted to achieve a desired temperature. This project presents the interfacing of temperature sensor with microcontroller by means of analog to digital convertor, to display the temperature on a 16x2 LCD and to rotate a DC motor at different speeds at various temperatures. The pulse width modulation speed control function is a function that externally controls the rotation speed of the fan by changing the duty cycle of the input pulse signal between the control terminal and GND. Figure1.1 block diagram
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www.iaard.net IAARD Journals eISSN: 2455-3204
International Journal of Computer
Science and Information Technology International Journal of Computer Science and Information Technology, 2016, 2(1),8-11
T.Chockalingam et al., Page No.8
Temperature based dc fan speed control system using microcontroller and pulse
width modulation technique using PIC16F877A
T.Chockalingam 1,
Melese Yemane1and A.Agasthian
2
1Ambo University, Ambo, Ethiopia
2Network Administrator, Annauniversity, Thoothukudi Campus, India