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TEMPERATURE DEPENDENT ELECTRIC FAN Temperature Sensor Speed Controller Increment Decrement Enter MCU Switch AC/DC Selector LCD Screen LIST OF MATERIALS QUANTITY DESCRIPTION 3 Push Button 1 Arduino Leonardo Board 3 330Ω Dropping Resistor 1 3k Ω Resistor 1 Relay Driver 1 LCD 16x2 1 LM35 Temperature Sensor 1 LM7805 Voltage Regulator 4 IN4001 Diode 1 1000µF Capacitor 1 Electric Fan with AC/DC Selector PROCEDURE: 1. Make a power supply for the Arduino Board using LM7805 Voltage Regulator together with a bridge type diode and filter capacitor. 2. Designate pins for the Input/Output of the Arduino Board. 3. Connect a dropping resistor for the Input Push Buttons. 4. Connect a relay driver to the designated output pin of the Arduino Board. 5. Connect the supply and the signal of the temperature sensor. 6. Use the analog pin of the Arduino Board for the signal of the temperature sensor. 7. Connect the pins of the LCD Screen to the Arduino Board: LCD Arduino Board Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 11 Pin 12 Pin 13 Pin 14 Pin 15 Pin 16 Ground +5V 2.2KΩ from the ground Pin 8 Ground Pin 9 Pin 10 Pin 11 Pin 12 Pin 13 +5V Ground 8. Cut either one of the wire coming from the selector switch of the fan and connect it to the relay driver (NC). 9. Create a program for the Temperature Dependent Electric Fan. Note: The fan will automatically turn on and off depending on the temperature reading of the sensor. The fan will turn on when the actual temperature is higher than the temperature limit and will turn off when the actual temperature is less than or equal to the temperature limit after a delay of 30 seconds.