100+ Best Electronics Mini Projects for Engineering Students

We would like to provide you with a huge list of electronics mini project ideas for your engineering project work, along with the components list, circuit diagram, code, working principle, and applications. This list has a combination of our own making DIY projects and a few other projects done by some other websites.

Password Based Door Lock System using 8051 Microcontroller

This mini project demonstrates a password-based door lock system wherein once the correct code or password is entered, the door is opened and the concerned person is allowed access to the secured area.

IR (InfraRed) Proximity Sensor / Obstacle Detector Circuit Using LM358

An infrared proximity sensor by utilizing IC LM358 with simple step by step process. The activity of this sensor is so basic when an object is before the sensor, the alarm or LED will glow up. We have two IR LEDs, a transmitter and a receiver.

Simple Fire Alarm Circuit

This mini project demonstrates a fire alarm circuit that detects nearby fire in a small radius and the sensor activates the op-amp LM358 to produce the output Sound through a buzzer. 

Adjustable Voltage Power Supply

An adjustable voltage power supply with LM317 regulator ic which inputs AC supplies (220V-230V AC) and outputs DC voltage. It is commonly used for voltage regulation in today’s circuit industry. This ic has the ability to control over-voltage protection, internal current controlling, overload protection, and many more.

LED Chaser Using 555 Timer & 4017 Counter

This mini project demonstrates a led chaser circuit can be made using 555 timers and CD4017 IC with some simple steps. This mini project can be used in blinking lighting, chaser lighting, and many decorative items.

Ultrasonic Sound Generator Using 555 Timer

A simple Ultrasonic Sound Generator that can be used for various purposes such as a sound generator, mosquito repeller, and like this. This project uses an astable mode multivibrator with IC 555 which produces the desired frequency by altering the variable resistance.

Infrared Proximity Sensor Using 555 Timer

The operation of this sensor is so simple when an object is in front of the sensor, led will light up. We have two IR LEDs, a transmitter and a receiver. When the current passes through the transmitter led, it will emit IR rays.

Simple Burglar Security Alarm Circuit

We can use a burglar alarm system in residential buildings, commercial buildings, offices, industries, and military bases. In most cases, these security systems are too much costly but this inexpensive project can overcome such problems.

How To Make A Metal Detector Circuit

This mini project demonstrates a simple metal detector circuit that is very useful for checking the person in shopping malls, hotels, cinema halls to ensure that person is not carrying any explosive metals or illegal things like guns, bombs, etc.

Darkness Detector Circuit Using 555 Timer

This mini project demonstrates a darkness detector that detects darkness using the cheapest light sensor that is LDR (Light Dependent Resistor). Darkness Detector circuit can helpful for use in applications where the light will be going to off. 

Low-Cost Audio Amplifier Using LM386

This mini project demonstrates a low power audio frequency amplifier that is helpful in a small audio amplifier project. The IC consumes very little power and a 9V battery can operate it easily. It can easily drive an 8 Ω speaker or two 4 Ω speakers.

TDA2030 Amplifier Circuit With Basic Components

I will show you a cheap class AB audio amplifier using a few components. If you need to build the amplifier circuit in your home. The TDA2030 Amplifier circuit is a nice choice. Because it’s miles a reasonably-priced IC and easy to use.

Simple Mobile Phone Detector Using LM358

This mini project demonstrates a cell phone detector that can detect the nearness of an active cell phone from a separated distance of four to five meters. So it can come helpful in an assessment lobby or gatherings.

Smoke Detector Alarm Using LM358

A Smoke detector is a smoke detecting gadget that shows fire. Smoke alarms are exceptionally normal in homes, workplaces, schools, and industries. Smoke alarms are extremely helpful gadgets as the harm brought about by fire mishaps is disastrous.

Water Level Indicator Alarm With Transistor & 555 Timer IC

Water tank flow is a typical issue that prompts the wastage of water. In spite of the fact that there are numerous answers for it like ball valves which consequently stop the water stream once the tank gets full.

12V Battery Charger Circuit With Auto Cut Off

This mini project demonstrates a 12V battery charger circuit with auto cut off when the battery level is below the maximum threshold voltage. When the battery gets its maximum voltage then the circuit will automatically cut-off the charging of the battery. Thus it prevents by overcharging of the battery.

Rain Alarm Circuit Using Two Transistors

This is very useful for home use because it alerts us whenever the rainwater falls on the two probes which will turn on and the buzzer will start to beep.

Ding Dong Doorbell Circuit Using 555 Timer

Doorbells are basic in each house. We, every day watch various sorts of doorbells are accessible in the market and they produce various kinds of music relying upon their usefulness.

DC to DC Boost Converter Circuit

This mini project demonstrates a simple and modest DC to DC boost converter circuit with 555 Timer IC. A boost converter is a DC to DC power converter that increases up the voltage to a fixed certain level by getting a certain amount of specified input voltage.

Car Parking Guard Circuit Using Infrared Sensor

This circuit helps the person in the driving seat in such a way that it gives an alarm if there is any obstacle or a wall while parking or while driving in reverse. This mini project is very useful in real life.

Battery Charger Circuit Using SCR

Here is the circuit diagram of battery charger circuit using Silicon Controlled Rectifier. SCR can be used in half wave rectifier, full wave rectifier, inverter circuits, power control circuits, etc.

Interfacing GPS with 8051 Microcontroller

In this interfacing of GPS with 8051 circuit, GPS module calculates the position by reading the signals that are transmitted by satellites.

Speed Control of DC Motor Using Pulse Width Modulation

This pulse width modulation technique is the more efficient way to proceed to manage the speed of our DC motor manually.

FM Remote Encoder/Decoder Circuit

This is a simple post that shows you how to design FM remote encoder and decoder circuit using RF600E and RF600D ICs. This pair of encoder and decoder ICs establishes communication with high-level security. The operating voltage of these ICs is from 2V to 6.6V DC.

Wireless Mobile Battery Charger Circuit

This mini project mainly works on the principle of mutual inductance. This circuit may be used as a wireless power transfer circuit, wireless mobile charger circuit, wireless battery charger circuit, etc.

Simple 100W Inverter Circuit

This mini project demonstrates a small Inverter circuit which converts the direct current (DC) to alternating current (AC).

Battery Level Indicator

This mini project explains to you how to design a battery level indicator. You can use this circuit to check the car battery or inverter. So by using this circuit, we can increase the lifetime of the battery.

FM Radio Circuit

This mini project demonstrates an FM Radio circuit is the simple circuit that can be tuned to the required frequency locally. This mini project describes the circuit of the FM radio circuit. This is a pocket-sized radio circuit.

LED Lamp Circuit using USB Port

This mini project demonstrates a simple USB LED Light circuit which produces an output of 5v. It may be used as an emergency light and also as a reading lamp.

Digital Voltmeter using 8051 Microcontroller

This mini project demonstrates a simple digital voltmeter circuit designed using 8051 microcontrollers. This circuit measures the input voltage from 0V to 5V. Here, the input voltage should be DC voltage to get the accurate output on LCD.

Wireless Switch Circuit using CD4027

This mini project demonstrates a simple circuit that needs no physical contact with the appliance. In this circuit, all you need is to pass your hand above LDR to ON or OFF the switch.

Water Level Alarm Using 555 Timer

This is a simple and low-cost hardware project using a 555 timer circuit. The aim of this mini project is to design a water level detecting alarm with simple and low-cost hardware without compromising on the performance of the device

USB Mobile Charger Circuit

This mini project demonstrates a circuit is useful in charging the mobiles through USB outlet present in our laptops and PCs. For the charging of your mobile phone, this circuit provides you a regulated voltage of 4.7 volts.

UP/DOWN Fading LED Lights

This mini project demonstrates a simple up/down fading LED light circuit that can be used in shopping malls, homes, and security applications.

7805 IC Voltage Regulator

This is a circuit diagram of 7805 IC which is a 5v DC regulation IC. It is very flexible and simple to use in many circuits like a voltage regulator.

Unbiased Digital Dice with LEDs

This mini project demonstrates a circuit diagram of digital dice. By using this circuit, there is no chance to cheat as the circuit operates at such a high speed. The circuit is almost imperceptible to the human eye.

Ultrasonic Rangefinder using 8051

This circuit explains to you how to measure the distance using 8051 microcontrollers. This ultrasonic range finder system measures the distance up to 2.5 meters at an accuracy of 1 cm.

TV Transmitter Circuit

The main principle of this circuit is to transmit audio and video signals. Here audio signals are modulation frequency and video signals are modulation PAL. These modulated signals are applied for the antenna.

Wailing Siren Circuit

The main principle of this circuit is to produce a wailing siren. The 555 timer IC is operated in astable mode. When the switch is ON, the speaker produces high pitch siren, and when it is OFF, its pitch decreases, and then switch it off after 30 seconds.

TV Remote Control Jamer

This proposed TV jammer circuit confuses the infrared receiver in a TV by producing the constant signal that interferes with the remote control signal. If you switch on the circuit once, the TV will not receive any command from the remote.

Transistor Intercom Circuit

This transistor intercom circuit is a simple two-way intercom circuit which is used for the dual purpose of sending as well as receiving signals.

Piano Using 555 Timer Circuit

This is the circuit diagram of simple Toy Piano using 555 Timer IC. It produces different tones or sounds depending on the frequency range.

Touch ON and OFF Switch Circuit

This Touch ON/OFF Switch circuit is more useful in such a way that we can automatically ON or OFF any switch by touching a device without moving from our place.

Temperature Controlled DC Fan

The main principle of the circuit is to switch on the fan connected to DC motor when the temperature is greater than a threshold value. This can be used in home applications and in CPU to reduce heat.

Super Sensitive Intruder Alarm

This circuit alerts the user when an intruder enters the home. If there is any obstacle in front of the IR sensor, it generates an interrupt signal. This interrupt signal is given to the speaker to alert the user.

Sun Tracking Solar Panel

This article describes a circuit that rotates solar panels. This Sun tracking solar panel consists of two LDRs, solar panel, stepper motor, and a microcontroller.

Stun Gun Circuit

This stun gun circuit mainly uses as a weapon to stun or send shock waves to the target with the intention to weaken or paralyze it.

SR Flip Flop with NAND and NOR Gates

SR Flip Flop, also known as SR latch is the most vital as well as broadly used Flip Flop. Get an idea about the design of SR Flip Flop with NAND and NOR Gates.

Cell Phone Based DTMF Controlled Garage Door Opening System

Here is a mobile controlled garage door opening system. This system uses DTMF technology for controlling the door.

Solar Battery Charger Circuit

Here is the simple circuit to charge 6V, 4.5Ah rechargeable Lead-acid battery from the solar panel. This solar charger has current and voltage regulation and also has over voltage cut off facilities.

Simple LED Blinking Lights Circuit

Here is the best example for simple LED blinking lights i.e. LED Flasher which blinks the LEDs in a regular time period. This circuit can use for decoration purposes or can be used for a signaling purpose.

Simple FM Radio Jammer Circuit

This is a Jammer circuit that can block the signals. Jammer circuit produces the high-frequency signal which will confuse the receiver of the particular system from receiving the signal, even though the circuit is working properly, the user of the system feels that circuit is not working properly.

Audio Tone Control Circuit

This article explains to you how to design an audio tone control circuit with a gain of around 25. This design needs less number of components and it is cost-effective.

Security Alarm Circuit

This circuit helps you to guard your precious documents as well as jewelry from intruders or theft. All you need is to just place this circuit in front of the locker or below the mat so when any unknown person comes and walks over the switch, the circuit will trigger and the sound of alarm comes.

Remote Control Circuit through RF without microcontroller

Here we use RF434 MHz modules to make wireless remote. Using this remote, we can control the appliances within a range of 100 meters. Applications of this remote are burglar alarm, car door alarm, calling bell, security systems, etc.

RFID based Attendance System

This simple RFID based attendance system is designed using an atmega328 microcontroller and is mainly used in educational institutions, industries, etc. where authentication is needed.

555 Timer IC Testing Circuit Working Principle

The 555 Timer IC is one of the most popular and most frequently used integrated circuit in mini project. It performs an array of timing tasks in the electronic circuits and there is a huge list of experiments which can be performed with 555 IC.