26-06-2012, 03:24 PM
TERMPERATURE CONTROLLED FAN
[attachment=25608]
ABSTRACT
This project is a standalone automatic fan speed controller that controls the speed of an electric fan according to our requirement. Use of embedded technology makes this closed loop feedback control system efficient and reliable. Micro controller allows dynamic and faster control. Liquid crystal display (LCD) makes the system user-friendly. The sensed temperature and fan speed level values are simultaneously displayed on the LCD panel. Micro controller is the heart of the circuit as it controls all the functions.
The temperature sensor LM35 senses the temperature and converts it into an electrical (analog) signal, which is applied to the micro controller through ADC. The analog signal is converted into digital format by the analog-to-digital converter (ADC). The sensed and set values of the temperature are displayed on the LCD. The micro controller drives control relays to control the fan speed with the help of high wattage tagged wire wound resistor.
A buzzer is provided for audio indication of fan speed variation. Whenever the fan speed is increased / decreased, the system acknowledges by a short beep. The relays are used to operate the electrical fan or for operating any other electrical device. Normally the relays remain off. As soon as pin of the micro controller goes high, the relays operate
The system uses a compact circuitry built around 8051 microcontroller Programs are developed in Embedded C. Flash magic is used for loading programs into Microcontroller.
Software: Embedded ‘C’
Tools: Small Device C Compiler & Keil uvision.
Target Device: PHILIPS P89C51 40-pin DIP package.
Applications: industrial applications, house hold applications.
Advantages: automated operation, Low Power consumption.
[attachment=25608]
ABSTRACT
This project is a standalone automatic fan speed controller that controls the speed of an electric fan according to our requirement. Use of embedded technology makes this closed loop feedback control system efficient and reliable. Micro controller allows dynamic and faster control. Liquid crystal display (LCD) makes the system user-friendly. The sensed temperature and fan speed level values are simultaneously displayed on the LCD panel. Micro controller is the heart of the circuit as it controls all the functions.
The temperature sensor LM35 senses the temperature and converts it into an electrical (analog) signal, which is applied to the micro controller through ADC. The analog signal is converted into digital format by the analog-to-digital converter (ADC). The sensed and set values of the temperature are displayed on the LCD. The micro controller drives control relays to control the fan speed with the help of high wattage tagged wire wound resistor.
A buzzer is provided for audio indication of fan speed variation. Whenever the fan speed is increased / decreased, the system acknowledges by a short beep. The relays are used to operate the electrical fan or for operating any other electrical device. Normally the relays remain off. As soon as pin of the micro controller goes high, the relays operate
The system uses a compact circuitry built around 8051 microcontroller Programs are developed in Embedded C. Flash magic is used for loading programs into Microcontroller.
Software: Embedded ‘C’
Tools: Small Device C Compiler & Keil uvision.
Target Device: PHILIPS P89C51 40-pin DIP package.
Applications: industrial applications, house hold applications.
Advantages: automated operation, Low Power consumption.