Automatic fan controller circuit//Automatic fan on off Temperature sensor
This is a project on an automatic fan which changes its speed with change in temperature. The temperature of the room is displayed on the LCD.
Arduino-1
Motor(with fan)-1
16,2 lcd display-1. (I have used a development board)
L293d(motor driver)-1(I have used a development board)
Bread board-1
LM 35 (temperature sensor)-1
Card board or any platform
Few jumper wires
Potentiometer-1
Tools
- computer with Arduino software
- cable to connect Arduino to computer
Connecting the LCD display to Arduino
-RW to ground
- RS to 12
- Enable to 11
- D7 to 2
- D6 to 3
- D5 to 4
- D4 to 5
- wiper to VO
- pin A of potentiometer to ground
- pin B of potentiometer to Vcc
Connecting l293D to Arduino
- Pin 1 of l293D to enable (5v)
- pin 2 of l293D to pin 7 Arduino
- pin 3 of l 293D to pin motor
- pin 6 of l293D to pin motor
- pin 4 of l293D to ground
- pin 7 of l293D to pin 8 Arduino
- pin 8 of l293D to 5v
- pin 16 of l293D to 5v
Connecting LM35 to Arduino
- Vcc (1st pin) to 5v
- Output (2nd pin) to Ao of Arduino
-Ground(3rd pin) to ground
Hello Friends! Today we're talking about the Automatic Fan Controller Circuit, How does it work? We are going to explain you complete circuit working step by step with reference to voltages appears in the each point of electronic components.
The project Automatic Fan speed Controller as its name suggests it will automatically On/OFF the Fan according to the set point of the room temperature. It is a standalone automatic fan speed controller that controls the electric fan according to our requirement or you can say according to the set temperature. It is very compact, small size circuit designed using few components and can be implemented for several applications including air-conditioners, water heaters, ovens, heat-exchangers, mixers, furnaces, incubators, thermal baths.
Working:
This project uses IC LM35 as a sensor for detecting accurate centigrade temperature and LM 358 comparator IC. Output voltage of this sensor is linearly proportional to the Celsius (Centigrade) temperature. This sensor uses the fact that, as temperature increases, the voltage across the output increases at a known rate. Output of IC is 10mv/degree centigrade for example if temperature is 27 degrees then the output of sensor will be 270mv or 0.27V. Output of the sensor is feed to the Pin 3 i.e non inverting terminal of Op-Amp(Comparator IC) LM358. This IC compares the Sensor voltage with the reference voltage which is already set at the inverting terminal of the LM358.
If temperature increases the output of the Sensor also increases, LM358 compares the output and if temperature is greater than the set point, then it will generate high signal to pin 1 of it. At the output of LM358 we have connected one resistor through which we operate the Transistor BC548(NPN). NPN transistor is used to activate the Relay. Relay finally operates the Fan.
If temperature goes down then comparator IC generates 0 Signal at the output of it, through which relay gets switched OFF and ultimately the Fan also turns OFF.
Automatic fan controller circuit//Automatic fan on off Temperature sensor
This is a project on an automatic fan which changes its speed with change in temperature. The temperature of the room is displayed on the LCD.
Arduino-1
Motor(with fan)-1
16,2 lcd display-1. (I have used a development board)
L293d(motor driver)-1(I have used a development board)
Bread board-1
LM 35 (temperature sensor)-1
Card board or any platform
Few jumper wires
Potentiometer-1
Tools
- computer with Arduino software
- cable to connect Arduino to computer
Connecting the LCD display to Arduino
-RW to ground
- RS to 12
- Enable to 11
- D7 to 2
- D6 to 3
- D5 to 4
- D4 to 5
- wiper to VO
- pin A of potentiometer to ground
- pin B of potentiometer to Vcc
Connecting l293D to Arduino
- Pin 1 of l293D to enable (5v)
- pin 2 of l293D to pin 7 Arduino
- pin 3 of l 293D to pin motor
- pin 6 of l293D to pin motor
- pin 4 of l293D to ground
- pin 7 of l293D to pin 8 Arduino
- pin 8 of l293D to 5v
- pin 16 of l293D to 5v
Connecting LM35 to Arduino
- Vcc (1st pin) to 5v
- Output (2nd pin) to Ao of Arduino
-Ground(3rd pin) to ground
Hello Friends! Today we're talking about the Automatic Fan Controller Circuit, How does it work? We are going to explain you complete circuit working step by step with reference to voltages appears in the each point of electronic components.
The project Automatic Fan speed Controller as its name suggests it will automatically On/OFF the Fan according to the set point of the room temperature. It is a standalone automatic fan speed controller that controls the electric fan according to our requirement or you can say according to the set temperature. It is very compact, small size circuit designed using few components and can be implemented for several applications including air-conditioners, water heaters, ovens, heat-exchangers, mixers, furnaces, incubators, thermal baths.
Working:
This project uses IC LM35 as a sensor for detecting accurate centigrade temperature and LM 358 comparator IC. Output voltage of this sensor is linearly proportional to the Celsius (Centigrade) temperature. This sensor uses the fact that, as temperature increases, the voltage across the output increases at a known rate. Output of IC is 10mv/degree centigrade for example if temperature is 27 degrees then the output of sensor will be 270mv or 0.27V. Output of the sensor is feed to the Pin 3 i.e non inverting terminal of Op-Amp(Comparator IC) LM358. This IC compares the Sensor voltage with the reference voltage which is already set at the inverting terminal of the LM358.
If temperature increases the output of the Sensor also increases, LM358 compares the output and if temperature is greater than the set point, then it will generate high signal to pin 1 of it. At the output of LM358 we have connected one resistor through which we operate the Transistor BC548(NPN). NPN transistor is used to activate the Relay. Relay finally operates the Fan.
If temperature goes down then comparator IC generates 0 Signal at the output of it, through which relay gets switched OFF and ultimately the Fan also turns OFF.
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