AUTOMATIC TEMPERATURE CONTROLLED FAN USING 8051

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AUTOMATIC TEMPERATURE CONTROLLED FAN USING 8051 ©Copyright 2016 : make it or take it.in

Contents: ©Copyright 2016 : make it or take it.in Project overview. Block diagram. Components used Microcontroller. Power supply BLDC fan Potentiometer NTC Software used. Circuit diagram. Working. Applications. Future scope. Conclusion. ©Copyright 2016 : make it or take it.in

Project overview: The fans are generally available with speed control; depending on the requirement the speed is set. Usually, when the temperature is high the fan set at high speed and at lower temperatures the fan is operated with lower speed. This is done manually using human. In this project, an automatic control solution is suggested to control the fan speed. ©Copyright 2016 : make it or take it.in

Block diagram: ©Copyright 2016 : make it or take it.in

Components used - Power supply: 7805 ©Copyright 2016 : make it or take it.in

Microcontroller – 8051: Features of 8051 microcontroller 4 KB on chip program memory. 128 bytes on chip data memory(RAM). 128 user defined software flags. 8-bit data bus. 16-bit address bus. 32 general purpose registers each of 8 bits. 16 bit timers (usually 2, but may have more, or less). 3 internal and 2 external interrupts. ©Copyright 2016 : make it or take it.in

MICROCONTROLLER USED AT89S51 The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of In-System Programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. ©Copyright 2016 : make it or take it.in

BLDC Fan Brushless DC electric motor (BLDC motors, BL motors) also known as electronically commutated motors . Brushless DC fans are usually available at three nominal voltages: 12V, 24V and 48V. If the system has regulated power supply in one of these, then a brushless DC fan may be selected which will give the exact performance required, regardless of the AC input variables which plague AC fans. ©Copyright 2016 : make it or take it.in

It is used to control the brightness of the LCD by connecting it at V0 Potentiometer A potentiometer, informally a pot, is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. Potentiometers consist of a resistive element, a sliding contact (wiper) that moves along the element, making good electrical contact with one part of it, electrical terminals at each end of the element, a mechanism that moves the wiper from one end to the other, and a housing containing the element and wiper. The potentiometer available are of multiple ranges, in this project the potentiometer used is an 10KΩ It is used to control the brightness of the LCD by connecting it at V0 ©Copyright 2016 : make it or take it.in

NTC Thermistor Thermistors are temperature-sensing elements made of semiconductor material that has been sintered in order to display large changes in resistance in proportion to small changes in temperature. This resistance can be measured by using a small and measured direct current, or dc, passed through the thermistor in order to measure the voltage drop produced. ©Copyright 2016 : make it or take it.in

We used keil uVision5 IDE software for concern project. Software used: Microcontrollers mostly use different software's from compiling code or to creating a ‘hex file’ till making its PCB( Printed Circuit Board ). Integrated Development Environment (IDE) - contains a text editor for writing code, a graphic window (Serial Monitor), a text console, a toolbar with buttons for compiling the code. We used keil uVision5 IDE software for concern project. ©Copyright 2016 : make it or take it.in

Working: A circuit with NTC temperature sensor, AT89S51 microcontroller, brush less DC motor and few of electronic components is designed and implemented to control the fan speed automatically. ©Copyright 2016 : make it or take it.in

Conclusion: The temperature is high the fan set at high speed and at lower temperatures the fan is operated with lower speed. This is done automatically. ©Copyright 2016 : make it or take it.in

Thanking You ©Copyright 2016 : make it or take it.in