Temperature controlled Fan speed

Temperature controlled Fan speedFree-shipping Output-guaranteed

Project Cost : 6,100

Dispatched in: 3 Days

Project Code: 1160

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Project Photographs:



Temperature controller can be done by using Electronic circuit, Microprocessor or microcontroller. Now microcontroller is advanced among all above circuits therefore we are using Microcontroller for temperature controlling.

In this project, microcontroller 89s51 forms the processing part, which firstly receives data from ADC. ADC receives data from temperature sensor through amplifier. Then microcontroller 89s51 performs the comparison of current temperature and set temperature as per the logic of program for which microcontroller has already been programmed. The result obtained from the above operation is given through output port of 89s51 to LCD display of relevant data and generated pulses as per the logic program which is further fed to the driver circuit to obtain the desired output of ceiling fan.

Block Diagram:

Temperature controlled Fan speed

You will get a CD with this project:

CD contains following things:


  1. Project Report in pdf format and in doc (word) format
  2. Circuit diagram
  3. PCB layout
  4. Microcontroller program in assembley language
  5. Hex file of the microcontroller code
  6. Datasheets of all the components / ICs used in the project

Description in detail:

Similar to other sensor based projects for final year, the “Temperature Controlled Fan” is also designed around the micro-controller. The main blocks of the system are:

Micro-controller board: It is a low-power, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash Programmable and Erasable Read Only Memory PEROM). The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the MCS-51. Instruction set and pin out. The on chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, it provides a highly flexible and cost effective solution so many embedded control applications.

Temperature Sensor Block: The temperature sensed by using LM 35. The output voltage of LM 35 varies in liner proportion with the temperature. The sensitivity of LM 35 is 10 mV/0C. For 1 0C output of LM35 is 10 mV. For 10 0C output of LM35 is 100 mV.

ADC Block: ADC means analog to digital converter. The output of signal conditioning is in the analog form. But Microprocessor requires input in digital form for this purpose we have to use ADC. In this project we are using ADC 0808. The reference voltage is +5 V. The resolution of ADC is 20 mV. Therefore for 20 mV output of ADC is (01) H. And for 100 mV output of ADC is (05) H.

Amplifier Block: Output signal from micro-controller 89C51 is weak so we have to amplify that signal. Amplifier block amplifies the signal for driving the final control element i.e. output device. For amplification Transistor BC 547 is used.

Output Block: In this project we are using FAN as output device. If temperature is above set point then Fan is ON so that temperature will start to decrease

Display Block: In this project we are using 16 X 2 intelligent LCD display to display the college name, temperature set point and very important is temperature of “Temperature Controlled Fan”.

Power Block: For our project we require + 5 Volt, – 5 Volt and +12 Volts supply. +5 Volts and. 5Volts is given to Micro-controller board, Temperature sensor, Signal conditioning, ADC etc. +12 Volts are used to drive the relay.

Applications and Advantages:

1. This project can be used in Home.

2. This project can be used in Industry.

3. This will help in saving the energy / electricity.

Future Development:

1. We can monitor more parameters like humidity, light and at the same time control them

2. We can send this data to a remote location using mobile or internet

3. We can draw graphs of variations in these parameters using computer

Video of the project: Temperature controlled Fan speed

Youtube video coming soon

Question and answers about this project:

Question: Which type of fan can be controlled using this project? AC or DC ?

Answer: We have used Triac to control speed of the fan. So you have to use AC fan. But we can provide DC fan as well if you want. Relay or transistor circuit can be provided to control speed of DC fan. Thus user can use fan operating on 12 volt (CPU fan).

Question: I want to control the Temperature using the Computer, Desktop. Can I get PC based temperature controlling ?

Answer: In the current project, Temperature monitoring on PC is possible, but it does not have facility of Controlling temperature using computer.

Question: I want to display temperature in Fahrenheit. Can you use LM34 instead of the LM35 to measure Fahrenheit instead of Celsius?

Answer: Yes, we can display temperature in Fahrenheit. We can use LM35 and can use formula to convert temperature from Fahrenheit to Celsius.


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16 comments on “Temperature controlled Fan speed

  • 20 July, 2013 at 10:22 am

    i’m a student at plateau state polytechnic Nigeria. I want 2 to how much will take me 2 get project with code number ”1160”

  • 26 August, 2013 at 3:50 pm

    plz give me the circuit diagram of this project,,,temperature controled fan speed

    • 30 August, 2013 at 2:49 pm

      Hi dipjyoti, you will get the circuit diagram after purchasing the project. You will get a CD containing all the documents and details.

  • 19 September, 2013 at 6:25 pm

    Please more information about r.p.m of fan

  • 24 September, 2013 at 2:19 pm

    can you please tell me that how we can vary the speed of the fan using PWM technique?

  • 30 October, 2013 at 3:19 pm

    how much will it cost if microprocessor will be used ?can you provide it to me?

  • 11 November, 2013 at 6:37 pm

    can you plz send me the synopsis of dc fan speed controller using temperature sensor……….

  • 16 April, 2014 at 11:14 pm

    can i still purchase this project off you and how long for postage to uk?

  • 4 August, 2014 at 7:20 am

    i want abstract for this project in that 1st control significance &theme of project

  • 12 November, 2014 at 11:32 pm

    can u tell me the working in detail of a temperature controlled fan regulator?
    at what power does it operate? pls provide me full working with values…urgently…

  • 22 January, 2015 at 11:04 am

    how graphically represent temperature with speed and how can measure speed variation with temperature

  • 27 January, 2015 at 1:04 am

    how to design microcontroller based temperature sensor

  • 6 February, 2015 at 11:20 pm

    Hey plz upload the video of this project ASAP. It would be pleasure

  • 14 February, 2015 at 11:36 am

    can U tell me what are the advantage &disadvantage of this project

  • 3 March, 2015 at 2:42 pm

    if I want to use he arduino instead of the microcontroller

  • 13 April, 2015 at 11:54 pm

    dear sir I want to 3 phase fan automatic control for room temperature


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