/Temperature-Controlled-Fan

Temperature-Controlled Fan System using AVR (ATmega 32)

Primary LanguageC

Temperature-Controlled Fan

Aim

Design a temperature-controlled fan using ATmega32 microcontroller, in which the fan is automatically turned ON or OFF according to the temperature. Use ATmega32 Microcontroller with frequency 1Mhz.

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Description

  1. LM35 temperature sensor will give continuous analog output corresponding to the temperature sensed by it. This analog signal is given to the ADC, which converts the analog values to digital values.

  2. The digital output of the ADC is equivalent to sensed analog voltage.

  3. In order to get the temperature from the sensed analog voltage, we need to perform some calculations in the programming for the microcontroller.

  4. Once the calculations are done by the microcontroller according to the logic, the temperature is displayed on the LCD.

  5. The microcontroller will continuously monitor the temperature and based on the temperature value, Microcontroller will drive the fan like that:

Temperature (C) Fan State Fan Speed (Percentage from Max)
Less than 30 OFF 0 %
Greater than or equal 30 ON 25 %
Greater than or equal 60 ON 50 %
Greater than or equal 90 ON 75 %
Greater than or equal 120 ON 100 %

  1. The main principle of the circuit is to switch on/off the fan connected to DC Motor based on temperature value. The DC-Motor rotates in Clock-Wise direction or stopped based on the fan state.

  2. The LCD should display the temperature value and the fan state continuously like that:

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  1. Control the DC-Motor speed using PWM signal generated from Timer0.

Embedded Drivers Used

Software Layered Model Driver Name
Application Layer (APP) Fan_Controller.c
Hardware Abstraction Layer (HAL) LCD / LM35_Sensor / DC Motor
MicroController Abstraction Layer (MCAL) GPIO / ADC / PWM

Deployment

To deploy this project

Install the Following Software:

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