Bc 548 transistor is used as a switch to control fan. The block diagram includes power supply, rst circuit, 8051 microcontrollers, lm35 temperature sensor, 8 bit adc, l293d motor driver, dc motor, 7segment display, ip switches. The main components of this temp control fan circuit is a negative temperature coefficient thermistor ntc which detects the temperature, a comparator which is used to compare the preset temperature value and a relay circuit to drive the fan. In this project i have tried to explain how to built temperature controlled fan with an arduino basically i have used transistor in order to drive motor. Temperature controlled fan using arduino starter kit. It is to control the internal cabinet temperature, of my cnc control cabinet, by varying the speed of the dc fan, ie, the fan. Its inv input pin2 gets an adjustable voltage through. It is accomplished by the data communications between arduino, lcd, dht11 sensor module and dc fan that is controlled by using pwm. Share on tumblr speed of fan can be varied by changing the input supply, if w need to change the fan speed depends on temperature changes means we can implement the following application note with arduino and temperature sensor lm 35. It is also a part of smart home application where the fan will. Ad590 is a temperature transducer, change temperature. It is also a part of smart home application where the fan.
Temperature controlled dc fan using thermistor operational. And last part of system shows humidity and temperature on lcd and fan driver. Automatic temperature controlled fan using thermistor. Second section reads the dht11 sensor modules output and extracts temperature value into a suitable number in celsius scale and control the fan speed by using pwm. Temperature controlled fan using arduino use arduino for. Over the time, advancements in electronics have made devices faster, cheaper and smaller. Temperature controlled fan using 555 circuit diagram.
Circuit diagram construction and working this circuit constructed with arduino uno board as a main part and lm35 as a temperature. We are going to make one simple miniproject which is temperature controlled dc fan using thermistor. Temperature controlled dc fan using thermistor mini. The given project is a demonstration of such system. Fan speed control system using pic16f877a microcontroller. Here is a simple circuit based on two transistors that can be used to control the speed of a 12 v dc fan depending on the temperature.
In this circuit, the temperature sensor used is an ntc thermistor, i. In the case of heavy loads such as heater loads of temperature controllers, the opening and closing of contacts can occur at any point in the waveform of the control. This change is reflected on the fan speed by regulating the current to the fan s motor. Temperature controlled dc fan electronic circuits and. Pdf nowadays technology is running with time, it completely occupied the life style of. Temperature controlled fan with an arduino instructables. Temperature controlled dc fan simplest thermistor circuit on. The projects are good example of embedded system basically designed using closedlooped feedback control system. The 1602 display showed the current temperature and humidity and the fan working status. A temperature controlled dc fan is a system which automatically turns on a dc fan when the ambient temperature increases above a certain limit. Temperature controller project using labview and arduino. Temperature controlled dc fan using thermistor scribd. Automatic room temperature controlled fan speed controller using pt100 article pdf available in international journal of scientific and engineering research 68.
One senses the temperature by using humidity and temperature sensor namely dht11. A small dc fan increases or decreases its speed as per the temperature change. Temperature controlled fan regulator circuitautomatic fan. This thermistor variable resistance value based on the temperature, when the temperature rises then thermistor resistance gets decrease and for temperature decrease then thermistor. In this circuit, pin 3 noninverting terminal of op amp 741 is connected with the potentiometer and pin 2 inverting terminal is connected in between of r2 and rt1 thermistor. Here two thermistors are used to measure the room temperature. The needed level of air circulation is maintained in various types of buildings and enclosed spaces, thereby ensuring efficient use of energy. Ic ua 741 is used as a voltage comparator to switch on the dc fan. The microcontroller will send the pwm signal through pinrc2 in portc to the transistor which works as a control to the fan. Temperature controlled dc fan using atmega8 microcontroller.
For proper user interface visual indication we had also used lcd which indicate temperature as well as speed of fan. In these circuits the microcontroller is used to control the fan according to the temperature. According to the temperature sensor readings, the duty cycle will be automatically changed for controlling fan speed. The aim of the project dc fan is to control a 12v dc fan using a power electronic circuit works on the operation of thermistor. The basic working principle of temperature controlled dc fan is based on the thermistor. Ad590 and lm335 ptc sensing circuit using lm358 lm324b wtc3243 fan control by using thermistor lm358 lm358 temperature controlled fan lm324c circuit diagram of pi controller using. Automatic temperature controlled fan circuit using. The block diagram of the temperaturecontrolled fan using a microcontroller is shown in the above figure. Share on tumblr simple temperature controlled dc fan circuit is designed with negative temperature coefficient thermistor and an operational amplifier. Temperature controlled fan using 8051 microcontroller. Simulation of thermistor controlled fan using matlab. This is a simple automatic temperature controlled fan circuit using ntc thermistor.
This fan regulator circuit will automatically control the speed of your fan according to the temperature. Temperature sensor takes a very low current of order 60. Lm 358 compares the voltage across the ntc thermistor and voltage across the 4. Construction of a temperature controlled fan using a. The key component of this temperature controlled fan circuit is thermistor, which has been used to detect the rise in temperature. In this temperature controller project, we will use thermistor for measuring the temperature of a liquid or any other material.
This project is about how the speed of a fan can be controlled, based on temperature sensor. Temperature controlled dc fan using thermistor free download as word doc. Then we will check if the temperature value is greater than 35 or not, if the temperature will be greater than 35, then the relay will be activated and the fan. Circuit diagram of automatic temperature controlled fan using thermistor. Working of temperature controlled dc fan using thermistor it works on the principle of thermistor. Doc temperature controlled dc fan using thermistor. Simplest 12v cooling fan controller with temperature status using thermistor temperature sensor ntc mf52103 thermistor, nec d882 tp. So this heat should be reduced in order to protect the device. Automatic fan speed control system using arduino 1kunal singh, 2moloy dhar, 3pritam roy.
Temperature controlled dc fan using thermistor slideshare. Temperature controlled fan using arduino engineering. It uses lm35 as temperature sensor and dc motor as a fan as a temperature. Automatic room temperature controlled fan speed controller using pt100. The circuit will control the speed of the fan automatically according to the temperature.
Alternatively, the same circuit can be used for automatic temperature controlled ac power control. The project temperature controlled fan using arduino is simply fabricated around arduino uno board and temperature sensor lm35. Design and development of arduino based automatic fan. In this electronic project, we are going to make temperature controlled dc fan using thermistor. In this mini project, we are going to control the speed of the dc fan automatically as the surrounding temperature changes. Texas instruments incorporated ti has been published an article about intelligent. If you want to use it in a household fan, just add a relay control. The sensor circuitry is sealed and not subject to oxidation. How to make a temperaturecontrolled fan using arduino. A thorough check of the controlled equipment should be made to determine true operation condition.
The thermistor is a component which changes its resistance as its temperature changes. Over the last decade, advances in electronics have made devices smaller, cheaper and faster. In this mini project we are going to control the speed of. This project report on control of dc fan is about the dc fan and its control, the report provides the detailed explanation of dc fan, its use and how dc fan work. A rectified 12v dc input is given to the circuit which contains an arrangement of thermistor. Hi does anyone have a simple sketch and schematic for the above, or at least point me in the right direction. The circuit of automatic temperature controlled fan is build around temperature transducer ad590 followed by operational amplifier lm324. Sushma verma designed an automatic temperature controlled fan using thermistor which can. It cools the devices by operating a dc fan when the temperature in its surrounding area increases above the preset level. Two thermistors r1 and r2 are used to sense the temperature. It can also be used in home application where the speed of fan.
At room temperature the voltage across the ntc will be greater than or equals to the voltage across the 4. We will use the dht22 sensor to get the temperature value and we will print this temperature value on the lcd. We are using three leds to indicate temperature range. Temperature controlled dc fan using thermistor mini project. The temperature controlled fan is an alternative way to control the speed of the motor in that modulates the speed of the fan in response to changes in ambient temperature. Automatic temperature controlled fan electronics project. So all these are basic building blocks of temperature controller system. Temperature controlled dc fan using microcontroller. This project is to control the speed of the motor, based on the temperature sensor. Temperature controlled dc fan is basically a temperature based fan.
Automatic fan speed control using pic16f877a microcontroller. Simplest 12v cooling fan controller with temperature status using thermistor temperature sensor ntc mf52103 thermistor, nec d882. Pdf automatic room temperature controlled fan speed. In this circuit, pin 3 noninverting terminal of op amp 741 is connected with the potentiometer and pin 2 inverting terminal is connected in between of r2 and rt1 thermistor which is making a voltage divider circuit. It can measure temperature more accurately than a using a thermistor. Make fan control temperature sensor circuit using thermistor duration. It cools the devices by operating a dc fan when the temperature.
The figure below shows a circuit of an automatic temperature controlled fan using 555. Temperature controlled fan report linkedin slideshare. Temperature controlled dc fan simplest thermistor circuit on youtube duration. Resistors that are not thermistors are designed to have a as close to 0 as possible, so that their resistance remains nearly constant over a wide temperature range. The basic working principle of temperature controlled dc fan is based on the working principle of the thermistor.