Top 38 Electronics Mini Projects

Hello friends, in this blog we will see the top 38 electronics projects. You can build these electronics circuits for your engineering projects. All these projects will include simple electronic components.

Electronics Mini Projects:

  1. To design a traffic signal that will avoid an accident at
  2. To design a system that will send an audio signal to a person when an obstacle at 1 meter
  3. A dryer system for drying wet clothes
  4. Traffic density based traffic signal
  5. Electric fencing to make an alarm on entering any animal into the field
  6. Cooler with automatic water filling
  7. Mobile charing by single socket with multiple connections
  8. Home automation
  9. Electric chair for a handicapped person
  10. The system for finding a number of passenger traveling for the same track, provide sharing of vehicle and reduce vehicle density
  11. Online registration of food dishes which are available at that time, the online app will display the status of registration and can get notify our turn in the queue
  12. Online agency giving contacts of owner and room availability  for students
  13. The system prevents car accident by sensing excess vibration, accordingly act by breaking or speeding
  14. A robotic arm or stick, with a camera to take an image of the object and pick the object
  15. Anti-breaking system when there is skid
  16. Digital code lock with Arduino LCD and keypad
  17. Monitor and control greenhouse environment
  18. Temperature monitor and display temperature on 16*2 LCD
  19. Water pump control using a level sensor
  20. A sensor-based system that detects water leakage of underground pipe
  21. The automatic barrier for railway crossing
  22. Fire detection alarm system
  23. Automatic room heater
  24. Smart card
  25. Fingerprint-based door lock using Arduino
  26. Burglar alarm
  27. DC fan control using PWM
  28. Dot graph/bar graph control using an analog voltage
  29. Rotating solar panel using Arduino
  30. Remote stepper motor control system
  31. GSM based weather reporting
  32. Advanced footstep power generation system
  33. Smoke detection using MQ-2 gas sensor
  34. Arduino based distance sensor
  35. Arduino based heart rate monitor
  36. Arduino based energy meter
  37. Arduino based battery charge


Fire Alarm Circuit using IC555 Mini-project

Hello friends, today we are going to make one simple mini project which is a fire alarm. In this mini project, we will make a fire alarm circuit using a timer IC (IC555) and thermistor. Here we are using a thermistor sensor to sense the fire. The working principle of fire alarm circuit depends upon working principle of a thermistor (i.e. thermistor changes its resistance as temperature changes). Thus when a temperature of thermistor increases because of fire its resistance also changes.

Fire Alarm Circuit using IC555 Mini-project

Circuit diagram:

The following figure shows the circuit diagram of fire alarm using IC 555 mini project:

Fire Alarm Circuit using IC555
Circuit diagram for Fire Alarm using IC555


Following components are required for making fire alarm circuit (mini project).

  • VR1 = 10Kő© Variable Resistor which is used for varying the sensitivity of the circuit.
  • R3, R7, R8 = 470ő©
  • R2 = 33 Kő©
  • R4 = 560 ő©
  • R5 = 47 Kő©
  • R6 = 2.2 Kő©
  • C1 = 10 ¬ĶF/16V
  • C2 = 0.04 ¬ĶF
  • C3 = 0.01 ¬ĶF
  • IC1 = NE555 (timer IC)
  • T1 = BC548
  • T2 = BC558
  • T3 = SL100B or (NPN transistors like 2N4922 , 2N4921,2N4238)
  • D1 = 1N4001
  • TH1 = Thermistor 10 Kő©
  • LS1 = 8 ő©, 1W speaker

Working of fire alarm circuit:

In this fire alarm mini project three components are very important i.e. thermistor, IC 555 (which is timer IC) and a third one is a transistor which is used to drive the circuit.

The timer IC used in this circuit works as an astable multivibrator oscillator which is used to oscillate in the audio frequency band. As stated earlier timer IC is driven by two transistors T1 and T2. The frequency of timer IC 555 depends upon the values of resistors R5 and R6 and capacitor C2. The loudspeaker which is used for fire alarm is connected to the pin no 3 of timer IC through transistor T3.

When the temperature of thermistor increases it causes a low resistance path for a current flowing towards the base of the transistor.

For this type of fire alarm circuit, we can use a power supply of 6V to 12V.


1) Thermistor does not have polarity.

bead type thermistor
bead type thermistor

2) The following figure shows the pinout diagram of timer IC 555:

IC 555 Pin configuration
IC 555 Pin configuration

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Temperature Controller Project using LabVIEW and Arduino

Hi friends, here we are going to build a small engineering project based on LabVIEW and Arduino. In this project, we are making Temperature controller using Arduino and LabVIEW. We will operate a cooling fan when the temperature goes above set point.

Before you start this project make sure that you have installed LabVIEW Interface For Arduino (LIFA) on your system. If not follow this article for installing LIFA: How to Interface Arduino with LabVIEW

Components required:

  • Arduino Uno (or Freeduino)
  • 10K ohm resistor
  • Thermistor
  • RGB LED (or separate LEDS can also be used)
  • DC fan (5V)


In this temperature controller project, we will use thermistor for measuring the temperature of a liquid or any other material. We are using three LEDs to indicate temperature range. Red LED is used to indicate the temperature is the above set point. Blue LED will indicate temperature lies between upper and lower set point. Green LED will indicate temperature below set point.

Front Panel of Temperature Controller
Front Panel of Temperature Controller

When the RED LED glows the cooling fan will turn on. Due to cool air (or you can also use a cooler water pump with relay circuitry), your object (liquid) will get cooled. When the temperature falls down DC cooling fan will get turned off.

Construction of Temperature Controller Project:

Interfacing thermistor with Arduino
Interfacing thermistor with Arduino

Temperature controller using LabVIEW and Arduino
Fig 2: Temperature controller using LabVIEW and Arduino
  • Connect thermistor and Resistor with the analog port of Arduino as shown in the first image.
  • Now connect three LEDs with positive terminals of each led to pin number 8,9 and 10. Connect negative terminal of LED with common (ground of Arduino).
  • Now depends on your application i.e. if you are using the small 5V dc fan you can connect it directly to the Arduino (pin number 3 and ground) using motor driver IC L293D (In the figure we have connected the motor directly but it should be not so. You should use a motor driver IC). If you are using 230V AC appliance you need a relay circuit. You can buy it from here.

Download LabVIEW Program: Click Here

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How to Make 10V DC Power Supply (PCB included)

Hi friends, in this short tutorial we are going to learn how to make 10V DC power supply using LM350 IC. You can use this circuit as your first or second year engineering electronics mini project. This circuit is capable of producing 10V DC output at a current rating of maximum 3A. It uses LM350, a three terminal positive voltage regulator. It can produce an output voltage ranging from 1.2V to 33V for the input voltage of 14V to 24 V obtained from the AC mains through a step-down transformer. The capacitor C2 ensures the stability of the output from the regulator. To get different levels of the output voltage, the values of R2 and C3 can be varied accordingly.

Components required

  • C1 = 0.1uF
  • C2 = 1uF
  • C3 = 10uF
  • D1,D2,D3,D4 = IN5001
  • F1 = 3A
  • J1,J2 are screw terminals
  • R1 = 240O
  • R2 = 1.65K
  • U1 = LM350

Circuit diagram

10V DC Power Supply
10V DC Power Supply


You can download PCB Scematics here: 10V DC power supply

Features of 10V DC Power Supply

Input(V): 14VAC to 24VAC
Output(V): 10 VDC
Output load: 3A

Note: Use a ccl with 2oz Cu thickness for PCB fabrication.

This article is written by Heknath B Vicky. You can also submit your article and can earn 1$ per article. For more details click here.

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Interfacing 433MHz RF Modules with 8051 Microcontroller

Hello Friends Today I am going to show you how to use a 433MHz RF module in your 8051 Projects. The 433MHz RF module is one of the cheapest ways of wireless communication other than IR that you can use in your 8051 projects.There is receiving and Transmitting module that we will needed. You can easily find them online for3-4$(150-200 Indian Rs).

Components required

  • Microcontroller (P89V51RD2) (2)
  • Resistor 10K (1)
  • Capacitor 33pF (2)
  • Capacitor 10uF (1)
  • 11.0592MHz Crystal (1)
  • 433MHz RF Transmitter (1)
  • 433MHz RF Receiver (1)
  • Buzzer(optional) (1)

Circuit Diagram and Description

RF Transmitter-receiver

Receiving circuit
Receiving circuit

Transmitting Circuit
Transmitting Circuit

Connections of the Transmitter Module

The smaller module of the two with a crystal on it is the Transmitter module. The Pin connections for the module are as below

Pin on Module            Connection

GND               GND on 8051 Board

DATA             P3.1 on 8051 Board

Vcc                  Vcc on 8051 Board

ANT                Connected to 17.25cm long wire

Connections for the Receiver Module

The Larger module of the two is the Receiver module.The Module has multiple GND and Vcc pins which need to be connected externally. The Pin connections for the module are as below

Pin on Module            Connection

GND              GND on 8051 Board

DATA            P3.0 on 8051 Board

Vcc                 Vcc on 8051 Board

ANT               Connected to 17.25cm long wire

About the Program

In this particular program, we are using UART to transmit 8-bit data over the RF module. The data pin of the transmit module is connected to the transmit pin of the 8051. When the Switch 4 is pressed on the 8051 Board then the ASCII value of character t is sent over the RFmodule.If this is received at the receiving 8051 then the Buzzer will turn on for 5 Seconds.


Click here to download the C, Assembly and Hex file.

This article is written by Aditya Wani.

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How to Make 1 Amp Power Supply – Electronics Mini Project

Hi friends, today we are going to build a 1A power supply, which will power your projects and save money on batteries. It is suitable as an adjustable power supply for your projects. you can use this current supply for driving DC motors, low voltage bulbs, etc. So let’s start.

Specifications of 1A power supply:

We are going to build a 1A power supply such that it will have maximum benefits and specifications to the user. Our 1A power supply circuit will have following specifications:

  1. Preset voltage range: 1.5V to 35V
  2. Maximum input voltage: 28V AC or 40V DC
  3. Maximum dissipation: 15W
  4. Short circuit protection
  5. Thermal and overload protection

For different output voltage, we need to choose a specific transformer. Following table shows how to select right transformer.

Choose right transformer
Choose right transformer

Components required:

  1. Diodes: D1, D2, D3, D4 = 1N4007
  2. Resistor: R1=120O
  3. Potentiometer: RV1=4.7KO
  4. Capacitors: C1=0.1¬ĶF (104)
  5. Electrolytic capacitors: C2=1¬ĶF, C3=10¬ĶF, C4=2200¬ĶF
  6. Voltage regulator: VR1= LM317
  7. SK1 and SK2 are terminal box.

Circuit Diagram:

1A Power Supply Circuit Diagram
1A Power Supply Circuit Diagram


Build the circuit as shown in circuit diagram. Connect the AC signal of the transformer (output of transformer) at SK1. Set the desired output voltage by the use of RV1 potentiometer. Mount voltage regulator LM317 along with heat sink if you are using high power application.

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How to Make Metal Detector – Final Year Project

Hi friends, today we are going to build a very useful circuit which is Metal Detector. We all know about Metal Detector equipment which is widely used at security points. Same kind of Metal Detector we are going to build today. Our circuit is more powerful which can detect the presence of metal inside walls. If you want to drill a hole in walls, we can use this Metal Detector to check if there is any metal pipe like gas pipeline or water pipes, etc.

Features of Metal Detector

  1. Detection Range: 8 cm (3″ approx.)
  2. Power supply: 9V Battery
  3. Power consumption: 30mA max.
  4. Output form: LED or/and Buzzer

Components required

  1. Coils: It consists of two windings around the ferrite core. Winding L1 has 120 turns and winding L2 has 43 turns. We are using copper wire having 0.3mm thickness.

    Metal detector coil
    Metal detector coil
  2. Diode (D1): 1N4148
  3. Zener diode (ZD1): 3V9
  4. Resistors: R1=330O, R2=R3=470O, R4=2.7KO, R5=10KO
  5. Capacitors: C1=1200pF or 3300pF, C2=47nF
  6. Transistors: T1=T2=T3=BC547B
  7. LED (LD1): 5mm red
  8. Trim potentiometers: RV1= 2.5KO, RV2=100O
  9. Push button SW1

Circuit Diagram of Metal Detector:

Metal detector circuit diagram
Metal detector circuit diagram

Test and Adjustments:

  1. Connect a 9V battery to the circuit.
  2. Keep the circuit where there is no metal in the vicinity.
  3. Turn preset RV1 fully clockwise.
  4. Turn RV2 fully anti-clockwise.
  5. Depress the push button and hold it during the final adjustments.
  6. Now turn RV1 anti-clockwise till red LED goes out.
  7. Now turn RV2 clockwise until the red LED weakly lit.
  8. Now when metal comes in the vicinity of circuit red LED will be more brightly lit.

You can observe that we have one buzzer in the circuit. This buzzer is optional. If you want the output of the circuit in the form of a buzzer, you can connect the buzzer as shown in the diagram.

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Sound Activated LED Kit – Electronics Mini Project

Hi friends, today we are going to build another interesting electronic circuit which is sound activated LED kit. We can use this circuit for sound indicator applications or sound to the light unit in the music application. This project is also useful for hearing-impaired people. By use of this circuit, doorbell sound or phone ring sound produces light indications and thus hearing-impaired people can also perform a particular action.

Sound Activated LEDs

This circuit requires simple electronic components which you can easily find in any electronic components shop. There are no any expensive components in its circuitry, hence it’s a low-cost mini project. You can build this project for your second or third year engineering submissions. Let us build sound activated LED circuit step by step.


  1. Resistors:
    10KO: (R1)
    330KO: (R2)
    100KO: (R3, R4, R5)
    47O: (R6, R7, R8, R9)
    1.5MO: (R10, R11, R12)
    47KO: (R13, R14)
  2. LED: 5mm (LD1, LD2, LD3, LD4)
  3. Transistors: BC547 (T1, T2, T3) and BC557 (T4)
  4. Capacitor: 100nF (C1, C2, C3) and 100¬ĶF (C4)
  5. Potentiometer: 220K (RV1)
  6. MIC1

Circuit Diagram

Sound Activated LED
Sound Activated LED


As shown in the circuit diagram of sound activated LEDs, we have used a 220K potentiometer. The sensitivity of this circuit can be varied by using this potentiometer. We have used a built-in microphone (M300) for sensing the sound waves.

Power consumption for this circuit is near around 0.5mA min./12mA max. It requires a 8 to 15V DC power supply. You can also use a 9V DC battery.

Features of Sound activated LED kit

  1. Intermediate level
  2. Power consumption: 0.5mA min./12mA max.
  3. It has adjustable sensitivity
  4. Require small area for installation
  5. low cast and effective circuitry

I hope you liked this sound activated LED Kit. Try to build your own and let me know if you found any difficulties in it. Please share your comments below. Like our facebook page and subscribe to our newsletter for future updates. Have a nice day!

How To Build Home Made Electric Fan Regulator – Mini Project

Hi friends, in this article we will see one simple mini project for electronics and electrical engineering students. We all are familiar with electric fan regulator which we use for varying the fan speed. The basic principle behind regulator is a change of resistance.

This article is written by Mohamed Maricar & Modified by Mayuresh Joshi

Cheap and Best Electrical Fan Regulator

Electric Fan Regulator

Fig (A): shows the full view of connection diagram of the product
Fig (B): shows full view of the product and external side
Fig (C): shows the PCB without resistance


Components required:

  1. One Resistance = Rs. 0.15
  2. 28 Resistances = Rs.4.20
  3. One PCB = Rs.5.00
  4. One Rotator Switch = Rs. 8.00
  5. One Plastics Cabinet = Rs.5.00
    Total Cost = Rs. 22.20 Rupees Only

Steps to build electric fan regulator:

  1. First, we have to take PCB as shown in Fig (C)
  2. Then we put the Resistance and solder in PCB holes as shown in fig(A)
  3. Now we connect PCB ends with rotator switch as in fig (A)
  4. We connect rotator switch with AC supply
  5. Now if we vary the rotator switch we can get the different speed of motor
    1. The Resistance network is used to drop the voltages in five steps that are level
    2. The first step 13 volts dropped second steps 26 v third step 39v fourth step 53v
    3. By dropping the five level used to vary the speed of motor
    4. By dropping voltages we can vary the speed of electrical fan motor
  • What is my idea?
    My idea is to design a new circuit to reduce the cost and increase the performance of the product
  • What does it do?
    It regulates the speed of electric fan motor by dropping a.c. voltage in different level
  • How does it work?
    It is working by Ohms law and circuit theory principles
  • What makes my idea Unique?
    Cheap and best

Advantages of my product

  1. Cheap cost
  2. Low care
  3. Low power loss
  4. Low heat loss
  5. Good performance

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Accidental Vehicle Lifting Robot – Electronics Mini Project

Nowadays the number of road accidents increasing frequently. Whenever vehicle accident occurs on the road there may be a high possibility of traffic. In such cases, if we could able to move that accidental vehicle from the road, we can easily avoid the traffic. To make this possible we can build an accidental vehicle lifting robot using the embedded system. You can build its prototype using a small vehicle which you can easily found in the toy store.

Accidental Vehicle Lifting Robot

Accidental Vehicle Lifting Robot
Accidental Vehicle Lifting Robot


Working of Accidental Vehicle Lifting Robot

The working of this project is based on the microcontroller which is connected to a motor to move the accidental vehicle. Also, the microcontroller is connected to a chain based rod to lift the vehicle.

The complete circuitry of this project contains microcontroller board which has a robotic platform, keypad, electric motors to move the vehicles and lifting the chain based rod. These motors will be moved accordingly to the instruction given through keys connected to the microcontroller.

Components required


  • AT89c52
  • Robot platform
  • Driver circuit
  • Motor for lifting
  • Controlling keys
  • 12 v battery


  • Embedded ‚ÄėC‚Äô
  • RIDE/KEIL to write code
  • ISP to burn the chip

Advantages Accidental Vehicle Lifting Robot:

  • Low cost
  • automated operation
  • Low Power consumption

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