Electronics Mini projects

Mini Projects

CircuitsToday is listing some free engineering mini projects that can be presented and designed by students for their exams. These mini projects are applicable for B-Tech/BE engineering students from various streams like Electronics and Instrumentation (EI), Electronics and Communication (ECE), Electrical Engineering (EEE), diploma and so on. Though the electronic circuits may look complex, they are explained in detail along with a circuit diagram, and are explained with links of all devices that are used in the circuit. Please note that these projects are meant for students, hobbyists and enthusiasts. If there are any doubts regarding the circuit, feel free to comment on the post. You can also bring in any modifications you want, and ask us if you have doubts. Furthermore, please go through the existing comments to get a better idea of the electronics mini project topics. 

1.       Street Light Circuit

This minor mini project is used to design a street light that brightens up when night falls and automatically turns OFF when day light comes in. In order to detect the amount of light that is needed to decide when to cut-off the circuit and later activate it is done with the help of a sensor called Light Dependent Resistor (LDR). The main principle used behind the LDR is that, the presence of light causes the resistance of the sensor to go low. You can modify he circuit by placing LED’s instead of the 230 volt lamp. To know more about it, check out the comments given in the circuit. The circuit is comparatively easy to design, and further modifications can be made according to your choice.

2.       Battery Charger Circuit Using SCR

This is one of the most basic and best mini projects in electronics. A Silicon Controlled Rectifier (SCR) is used to rectify the AC mains voltage to charge the battery. The circuit consists of basic transistor switching methods and the components are cheap and are available in all electronics shops. A detailed description about the post is also given, which will give you a better idea.

3.       Air Flow Detector Circuit

This simple mini project is used to design an indicator to show the rate of air flow in a given space. The air flow is sensed with the help of an incandescent bulb filament. The variations due to the change of resistance in the bulb due to the air flow are given to the input of an LM339 operational amplifier. The circuit diagram and a better description of the circuit is given in the post above. Further modifications can be brought to the circuit and some of them are given in the comments section.

4.       Water Level Alarm Circuit

This circuit is used to produce an alarm output (bell or light), when the level of water rises above a certain level. This circuit uses a basic astable multivibrator made from a 555 timer IC. A resistance probe is set on a point at which the alarm is to set ON, as soon as the water rises up to that level.  A detailed circuit can be seen in the post above. The number of components needed for this circuit is very less and can be easily assembled on a PCB.

5.       Low Cost Fire Alarm Circuit

This circuit can be used for detecting a fire and producing an alarm, thus alerting the people in the building where it is installed. A transistor sensor called BC177 is used to sense the heat produced due to the fire. A preset level can be kept for the transistor. As soon as the temperature rises above the set preset level, the leakage current of the transistor rises, thus driving the other transistors in the circuit.  A relay is also used to switch the bell load as its output. The components needed for the circuit can be obtained easily and the circuit is easy to design.

6.      Single Chip FM Radio Circuit

This mini project is mainly meant for Btech EC students. An IC called TDA7000 is used for the purpose. The IC is integrated with a Frequency-Locked-Loop system with an intermediate frequency of 70 kHz. There have been many complaints that the IC is obsolete. Please check the comments to know the exact site to buy the IC. For more detailed explanation about the FM radio circuit, please check out the original post.

7.      Digital Stop Watch Circuit

The project consists of a digital watch designed with the help of a 555 timer IC and 4-bit digit counter IC called IC MM&4C926, and also a 7 segment LED display. The circuit can be easily designed and assembled on a printed circuit board. Further instructions and detailed working can be obtained from the original post.

8.      High and Low Voltage Cut-off With Delay and Alarm

This circuit can not only be presented as your mini project, but can also be applied on your home electrical equipments to protect them from over voltage fluctuations. The circuit requires very simple components like a monostable multivibrator using a 555 timer, a few transistors, and some diodes, relays ad LED.

The detailed explanation is given in the post above, and if you wish you can easily modify the circuit to make it an automatic voltage stabilizer.

9.      Light Activated Switch Circuit

This circuit uses an LM 311 comparator IC and a light dependent resistor as its sensor. The output of the LDR is given to the inverting input of the comparator. The resistance remains high when there is no light and the resistance drops as soon as light falls on it. This lessens the voltage at the inverting input and thus the comparator produces a high output which turns a transistor and thus the relay on. A much more detailed working can be obtained from the original post.

10.  Mobile Incoming Call Indicator

This circuit can be used to escape from the nuisance of mobile phone rings when you are at home. This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated.

Latest Mini Projects:- 

1. Water Level Controller using Micro Controller – AT89S51

This is a classic mini project for electronics engineering students. Developed using AT89S51 (a version of 8051 from Atmel) with a well explained circuit diagram and program. We have tested and verified this circuits functioning in our lab. The program is written in assembly language using the MCS-51 instruction set.

2. Frequency Counter Circuit using Avr Atmega8 controller

In this project, you can make a frequency counting device/system.We have developed this using Avr Atmega8 microcontroller. We have given the complete circuit diagram, software codes and other necessary information to make this project a reality.  If you are not familiar with Avr Atmega8 controller, we have developed a complete tutorial to learn Avr from ground. 

Note:- If you have any doubts, please ask in the comments section of the corresponding post

3. Digital Voltmeter using 8051 Microcontroller – AT89S51

In this project, you can make a simple digital voltmeter application which can measure upto 5 volts (0 to 5 volts). The circuit is developed using ADC0804 and AT89S51 micro controller. The output is displayed using two 7 segment displays. The software is developed in assembly language.

Show Comments

271 thoughts on “Electronics Mini projects

  1. gayathri

    Sir,I want mini project for doing by myself and submit in project expo please sujjest any one by sending that to my mail thank you

  2. DEVI.V

    I am devi vaithilingam your projects are give more ideas. please send more mini projects details in my e-mail address.

  3. vinitha

    we are implementing water level indicator using AT89C51 and we want to use a flow sensor in the circuit can you please help us.

  4. Samarth

    Hi sir I am Samarth from diploma in E&E. I want some circuits for my mini projects. Please send me its details and specifications and applications…

  5. Harshitha K N

    Hai sir, I am 3rd year EC student I want some innovative mini project circuits on LED topic plz help me with your knowledge. Thank you

  6. fahmi p

    I am a 3rd year b tech ec student .i need some wonderful and variety mini project ideas and simple too….and it should be super…

  7. Ajith Rajan

    sir, i am ajith third year electronics and communication student i want some innovative ideas for my mini project pls help me


    hello sir,
    iam third year ECE Student. i need a simple hard work project for low cost and simple circuitry. so, please send projects topic and full details of concept.

  9. bhima

    Sir plz I want a mini project idea, the project must be based on. Uc 8051 Sir plz suggest me the names of project

    • elizabeth

      im also a 3rd year ece student,i found a mini project on electronic attendence and door access by thumb print…it was made with 8051uc, intersting.but as ma guide wanted the project to be done with discreet components,i cant do it.as u hav to do your projct based on the same uc it seemed to me to give you this suggestion…Hope you find it helpful

  10. sharath

    i am a 3rd year student
    i got a project that is i have to design a device such that it directly converts the data from usb port and send it to vga port of projector without using laptop.
    please help me if anyone have relevant info.

  11. DIVYA

    Hello sir,
    I am DIVYA of third year ENTC student.Kindly sugest me some topics for my mini project of low cost and less circuitry.

  12. bins t jose

    Hai I’m bins t jose studying instrumentation & control engg.i would like to do a mini project without using microcontrollers.i would like to do medical electronic instrumentation based circuits.so please suggest me interesting projects.budjet below RS.7000/-

  13. priyadharshni

    Gudmrg sir..i am priyadharshni.. i am studying ece third year..i want some circuits related to digital ics..i want some innovative circuit and also it should be new…plz help me with ur knowledge..thank you so much sir..

  14. srujana

    Hai, I am srujana studying diploma final year in E.C.E. branch. I would like to do a project work related to “SOLAR SYSTEMS”. ls my choice is right ? I am totally confused. please suggest me some good,new and interesting projects quickly.

  15. Komathi

    Hai sir i am studying in 3rd yr ece dept .i want one simple mini project low cost&circuit diagram&components are plz sent me
    thank u sir

  16. Akash kumar

    sir.I studied 4th year in ece dept.i want 1 easy
    & miniproject in low cost.ideals and circuit sent me
    sir.thanku sir.


    Hai sir.I studied 3rd year in ece dept.i want 1 easy & miniproject in low cost.ideals and circuit sent me sir.thanku sir.

  18. jyothirlatha

    sir im a student of 2nd ece.i want a simple,new and mini project on electronics so plz suggest me a best topic.

  19. vinothini

    i want exciting and important project. its very important to world now a days . but its very simple to make even 2nd yr students


    Dear Sir,

    I need the circuit diagram of dancing LED with 20 to 50 LEDS the dancing of the LED must be based on the output of dvd player

    Kindly provide the circuit diagram……..

  21. Tanmayi

    Sir, we want to make a wireless charger.. please give us a simple circuit, to start with. I am a first year BTech ECE student.

  22. sree

    ask 433mhz transmitter and reciever is not available, at that situation what i will choose instad of ask 433mhz

    • Seetharaman

      UJTs are just triggering pulse generators can be used with thyristor devices. It is normally used in thyristor inverters see GE Application drawings.

    • ann

      i have mini project done with avr and zigbee.
      having report and product with me
      will give you for around 12000rs only.
      street light system using zigbee and microcontroller.
      it is latest topic.many functions are done with it.
      i am in trivandrum.if u want any details contact me

    • Seetharaman

      You can construct an LM317 based variable power supply which will be useful for day to day use and for powering mini projects, which you are planning in the future.

  23. kabir

    sir i like to make current by using wifi or fm frequency . here i saw mobile incoming call indicator so i think it will be easy to make current/ (12v atleast ) .so please help me to do this .i jus got a circuit but i couldnt make current as i wanted

    • Seetharaman

      You will get current in the range of micro ampere by transmitting high power signal consuming lots of power??!!!. The project may look very interesting but not practically viable please. Please note the mobile call indicator uses it’s own power supply not taking the radiated power to show direct indication.

  24. Ramesh

    i want block diagram for embedded system control using lpg leak detection and prevention on or before 11-3-2014

  25. sri gayathri

    sir i need an mini project in electronic side.i am not intrested to do the above projects.so plz send the detais about the new projects.

  26. devendra

    hello sir: i am 2nd year student of bio-medical engineering
    i want to do a mini project on bio-sensor,please tell me some inovative idea,

  27. Gugu

    Hello. I am currently busy with my in-service training(final year) in Electronic engineering and I would like you to give me an idea of an electronic project that will benefit a company that manufactures electronic fuzes.


    sir I am 3rd year degree student. I want to need a simple mini project and the material cost is minimum charge. related to electrical or electronics with circuit diagram but it should be effective and innovative.please send me a good one.

  29. vino

    i need a simple and low cost project but it should be effective.please send me a good one . i am doing second year eee.

  30. deepa

    sir I am 2nd year EEE student. I want to need a simple mini project and the material cost is minimum charge. please send any mini project with related to electrical or electronics with circuit diagram.

  31. priyanka

    as this mini projects has already done if i select this project and do whether it will b considered as my mini project or else it will b rejected??but i am not submiting tis as my main project just for gaining some knowledge i am working on tis mini project..

    • kishore

      hai priyanka this is kishore designing engg in RND.
      what are the projects currently you are working?
      what is your mini project?

  32. Arpu

    HEllo sir m looking for a project related to lED m a btech 1st year student please suggest me some helpfull mini projects list with related links of description how to make those projects.

  33. tripurari pandey

    in mobile incoming call indicator..
    the coil is used
    can i change dis nd attch another coil of some value..
    tell me values of coil

  34. Asha

    Thank you so much for providing this list of projects. It saved my time a lot. All the above mentioned projects are very interesting and useful for me. I have seen some more good electronics mini projects ideas in another page along with circuit diagram and detailed explanation. So, anybody interested to read, visit http://bit.ly/1ioHuHZ

  35. sindi

    Good day

    I’m a b-tech student Electronic Engineering ,pls assist Im looking for a Project for my design project 4 pls gv me suggestions.

  36. Akbar

    Sir I want to make an automatic alarm device which is used in some colleges.so,please give information about circuit design and which apparatus is required for that and how to set timings in that alarm………….

  37. arulselvi.s

    i am a 2nd yr EEE student and i have to do mini projects related to electrical tell me some recent technologies…

  38. Joseph jude

    I m 2nd yr cse student . I need some mini projects with latest innovation .can any send me to my email address with circuit diagram

  39. deeksha

    hello i am a final year student of B.Tech i have to make a mini project this year but i’m quite clueless about my project topic .can u help me with this.plz inform me about project topics which are easy and innovative as well.help me as i don’t know from where to start with.

  40. tejaswini

    I m 2nd yr student nd I m so excited to do any new fast , cheap and effective mini project. Plz send me suggestions

  41. mini transistor

    i want simple electronic project with diagram and procedure that how its working.
    please give me information in brief to submit the project.
    and it is not compulsory to give me info about only these only you will also provide me any type of simple electronic project.
    please provide me mail to how to make a electronic project

  42. rahul

    hello sir i want brif information and manual for electonic moskito ripelant
    circuit diagram and required material list

  43. kiran

    i m final year b.tech student.so i required ckt. digram of function generator with its full detail and proper working of that circuit

  44. Bert

    I am looking for a simple inexpensive kit/module/project for an elapsed time counter that starts counting UP from zero in hours and minutes when I give it a high or low and stops counting and displays the elapsed time in hrs and mins when I remove the high/low or give it another pulse. The elapsed time could be as much as 4 or 5 hours.

    Can you steer me to something that can be made to do this? My grandson (age 12) could build it but I do not speak any microcontroller software languages so can only go that route if it is pre-programed. Thanx.

    Bert Blanton

    • Shaukat ali

      Here you can any kind of mini project as your need with circuit diagram component and all info to complete your mini project:-)

  45. Manthen LR

    I am second year Electronics student.i feeling so happy to visit this website i fully understood by this information thank you so much

  46. yash

    i want to do unique mini project; and i want to see list of new project.so plz help me for that. i am final year diploma student of e&tc branch.

  47. johnson

    sir ,iam third year EEE,and its time for me to do mini projects ,need a variety and little complex design ….i would like to hear your suggestion please

  48. christo paul

    i am a 2nd year ec student. i need some mini electronic circuits which is interesting and inspiring at low cost materials

  49. rani

    I want to know about “low level serial flash spi[serial peripheral interface] driver” this is about embedded systems ., i want some information or abstract about that. help me to get through, thank u.

  50. esha

    Hi, sir can u give me the code either in assembly or C language for “Light Following/sensing Robot” and “wireless power transfer” using At89c51 microcontroller or tell me any other source plz i shall be greatful.

  51. neeha

    Hi,sir can u give me the code either in assembly language or in C for “Light following Robot” and “wireless power transfer” using At89c51 microcontroller or tell me any other source of finding this.

  52. K.Nandiniramana

    Im student cmpld my 3rd year eee .im interested in dng a mini project in the area of electronics .wht area i have 2 do my project

  53. calvin Azo.

    gooday,i’m an Electrical/electronics student and i am told to construct a 15volt input voltage amplifier using 555 timer interfaced with op-amp for my mini project. Can some one help me with the circuit diagram for such a combination?

  54. sachin

    we want some electronics mini projects with circuit diagram(latest),if u have some then plz send us…

  55. junaid ahmed

    this website is my most favorite… I had ever seen…..

    1.I want to build a solar charging mobile phones but with a moderate solar panel(equal to size of mobile phone panels) & EFFECTIVE as well …please send me some idea’s and circuits to my email ID..?????????

  56. syed.s

    iam working in pvt company,i want one simple circuit.i using 24volt sensor. i sensing one object, after 3 counting(24volt) one output 24volt go to on coil.Pls revert me if any clarifications my mail : ss_baboo@yahoo.co.in

  57. supriya hangargekar

    will u please send me the list of mini projects based on 8086 microprocessor…. we have the assignment consists of small project related to 8086 microprocessor.


    Those mini projects which are related to electronics are very useful in doing many projects……………….

  59. idris

    will you suggest any signal booster circuit which will boost signals coming to the antenna ,bcoz i am not getting good picture quality on tv screen

  60. idris

    i am not getting the signals to tv antenna properly,
    many times i am not getting good picture quality on my tv screen,
    so please will you suggest any simple circuit for the signal booster which will boots the signals coming to antenna and i will get a better signals

  61. shefna

    kindly provide the appications, advantages of batterry bank protector with multiple featurs, which was included in EFY magazine,hope you do the needful

  62. saranya

    i am doin ma thrd year b.tech engg. would u mind helping me with some topics for ma mini proj so that i could carry dat forward for ma final year main proj

  63. sandhya

    sir i want a totally different socially usefull miniproject….pls provide me neccesary topics with the necessary matter circuits and block diagrams

  64. pratik mote

    sir,am 2nd year entc engineering student…….and i wanted to do the mini project….i had choose fm transmitter…..soo plz do me some help for this project….send me information about fm transmitter on my id……thanku…

  65. rupesh

    I am in 3rd engineering. I want to make miniproject which i can carry forward for 4th year main project.
    And also useful in electronic n tele com industry
    pls suggest topics regarding this.
    Can i do on vlsi..?

  66. ubaid

    sir,i’m working on the avr project “gsm based home security system”.my coding is not very well i need help in programming of avr related to the project

  67. Shubham sharma

    Any one give me a working,theoretical background,principle used,block diagram & description of block,objectives,observation table,observation,etc.
    its my project name
    plzzz… replyyy…fasttt…

    • vanya

      pls change ur topic yaaaaaaaaaarrrrrrrrrrrrrrrrrrrrrr………………….
      otherwise u ll regret……………………..

  68. mohammedali

    sir iam studying diploma 3rd sem & we have a convergence in our college ie., i want to do any thing that can impress every one wit my skills so pls help me im frm ece department… eagerly waiting ur reply ie., for ur project help…

  69. aditya

    sir.. Last time when i was in 4th sem i had used ur inverter circuit for my mni project, it was …. NOw i want some low budget project for final year foe deploma in electrical and electronics…plz let me know if you have

  70. sudheer kumar

    i need the titles for the mini projects and i wish to do some mini projects in the microcontroller and to use the led to display something

  71. gowtham

    i need the titles for the mini projects and i wish to do some mini projects in the microcontroller and to use the led to display something

  72. sathya

    Myself sathya,frm IT…2nd year..i ‘ve a mini project in digital…i dono wt to do… i need ur help …looking forward ur reply…pls do some help for me..tq.

  73. Rathi

    Whether it is possible to implement bluetooth in digital cameras? Is this an easy task? Could someone help me out?

  74. bhavya

    i am in 5th sem ….i want to present hardware model in fest,,,so plz advise what mini projectregarding electroniccircuits relating i have to choose(some what simple)

  75. sangami

    i am looking for basic projects which related to current affairs with easy circuits.so will u pls send some more mini projects.

  76. bl@ckjack

    iam looking at project that involves coding i.e., a project that does not involve hardware
    pls help

  77. emmanuel gyampo

    Most of the people who are big time engineers rely mostly from circuits-today since they have used it before and after their engineering course.I was introduced to this site by Engineer Professor.

  78. Christy ann mathews

    I found this place very useful…still i would like to get the detailed circuit and components required of each of the above project.Really looking forward to your help.ty


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