TEMPERATURE BASED FAN SPEED CONTROLLER
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Existing Model

At present we use voltage regulators which are used manually to alter the speed of a fan .

MICROCONTROLLER

-The AT89S52 is a 40 pin microcontroller.

-Mainly microcontroller is based on single task.

-Microcontroller is famous because of

Interrupts

Timers/counters

Serial communication

ADC 0808


-The ADC0808 data acquisition component is a monolithic CMOS device with an 8-bit analog-to-digital converter, 8-channel multiplexer and microprocessor compatible control logic.

-The ADC0808 offers high speed, high accuracy, minimal temperature dependence, excellent long-term accuracy and repeatability, and consumes minimal power


LM 35 TEMPERATURE SENSOR


The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is
linearly proportional to the Celsius
(Centigrade) temperature.

Features

Calibrated directly in ° Celsius
(Centigrade)

Linear + 10.0 mV/°C scale factor

Rated for full −55° to +150°C range

Suitable for remote applications

Low cost

Operates from 4 to 30 volts