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.

ESP8266 WiFi Smart Plug Using NodeMCU

A WiFi Smart Plug is like a power-point adapter. It fits between your power socket and the appliance you wish to plug in. Most of the smart plugs communicate (any Wi-Fi network) to a central control hub. Then, the hub uses your Wi-Fi to send information to an app on your smartphone.

High-Voltage Stun Gun Using 555 Timer

A stun gun is a device used to generate a high voltage and low current signal. It is mostly used as a weapon to stun or shock waves to the target. The shock of it gets weak or paralyses the target. For its application, some countries banned this stun gun. This is actually a weapon that can paralyze a person mentally.

Motion Sensitive Automatic Light Using 4017 & IR Sensor

In this project, we are going to build a motion-sensitive automatic light using 4017 and an IR sensor. When somebody attempts to cross the sensor, the light will automatically turn on and it will glow consistently. And after coming back to the sensor range, it will automatically turn off.

150 Watt Power Amplifier Circuit

A power amplifier is a type of amplifier that provides minimum output impedance. It can be used to drive a speaker which requires high power at low impedance. In this project, we are going to build a power amplifier using a push-pull class AB configuration to get a power of 150W to drive a load of approx 8 Ohms.

Short Range FM Transmitter – 100m, 88MHz To 108 MHz

In this project, we are going to build a Wireless FM Transmitter that uses RF communication. This RF communication helps to transmit the medium or low-power FM signals. The maximum transmission range in this project is approx 100 metres.

PWM Motor Speed Controller Using 555 Timer

Today’s project is about PWM Motor Speed Controller using just 555 timer IC. It is useful for varying the speed of a low-powered DC motor. There are many circuits on the web that can control DC motors for electronic project purposes. But when it comes to controlling the motor uniformly and smoothly, the PWM motor speed controller is the best option like using AVR, 8051 and Arduino.

Temperature And Humidity Monitoring System Using NodeMCU And Blynk

In this project, we will build a cool temperature and humidity monitoring system using the NodeMCU development board. This project contains an ESP8266 NodeMCU, DHT11 temperature and humidity sensor and an LCD display for showing real-time values of surroundings.

Program ATtiny85 Microcontroller Using USB And Digispark Bootloader

By going to shrinkify Arduino projects are not possible sometimes according to their sizes. Even Arduino Nano also failed. Then comes a little chip to fulfil our expectation i.e. ATtiny85 Microcontroller. It works like a normal Arduino without any crystal oscillator or anything.

How To Build 12V DC To 220V AC 35W Inverter Circuit

In this tutorial, we will be going to learn how to build a simple 12V to 220V 35W inverter circuit. Inverters are often needed at places where load shedding is a common problem. There are two types of inverters, sine wave inverter which is very expensive, and modified inverters which price are inexpensive.

Voltage Doubler Circuit Using 555 Timer IC

A voltage doubler circuit is an electronic circuit that charges capacitors through input voltage and switches these charges twice the voltage produced at the output as at its input.

WiFi Controlled Robot Car Using Arduino And ESP8266

The concept of the WiFi Controlled Robot Car is so simple. The ESP8266 NodeMCU Module works as a network hub for connecting to the WiFi network and acting as a server. Coming to the client, a simple webpage is created and the browser which opens this web page acts as a client.

Thunder And Lightning Effect Using Arduino And AC Bulb

Today we are going to build a cool project that is a thunder and lightning effect using Arduino. Lightning is the most spectacular part of a thunderstorm. In fact, it is how thunderstorms got their name. The lightning causes the thunderstorm. A single stroke of lightning can increase the heat of the air to around 30,000°C that can expand fast the air. This expansion then creates a shockwave which turns into an explosive sound. That is called thunder.

Automatic Plant Irrigation System Using NE555 Timer

Nowadays, watering crops are a normal problem in the agriculture field. It is happening because farmers lack ideas about the availability of technologies. They lose their precious time pumping water to spread the entire field until it gets properly watered. So we here designed an automatic plant irrigation system using 555 timer ic.

Arduino Digital Clock With/Without DS1307 RTC Module

A digital clock is a great invention in electronics science. Nowadays, digital clocks are used everywhere. The analog clocks are quite old-fashioned. So the digital clock takes its place day by day. The Arduino digital clock is looking very modern. It has many additional features also like temperature, alarm, timer, etc.

Celsius Scale Digital Thermometer Using 8051 Microcontroller

A celsius scale digital thermometer is an electronic device that can measure the temperature of its surroundings and convert its analog data into digital form through a digital display. Today we will be going to make such type of celsius scale digital thermometer using an AT89C51 microcontroller and LM35 temperature sensor.

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.

Automatic Emergency Light Using Relay And 12 Watt LED

This project will show you an inverter-type Automatic Emergency Light with 12 watts LED panel. Load shedding is a common problem in today’s developing countries. By keeping the problem in mind, I will make a simple automatic emergency light that is operated through AC mains. It can also be operated through battery backup.

1.2V-12V Variable Automatic Battery Charger Using Relay

In this project, I will be going to show you a 1.2V to 12V variable auto-cut-off battery charger using a relay. When the battery level is below the maximum threshold voltage level, the charger starts to charge. When it gets its maximum voltage which is set, then the variable battery charger circuit will automatically cut the charging from the battery.

How To Build 12V DC To 220V AC 35W Inverter Circuit

how to build a simple 12V to 220V 35W inverter circuit. Inverters are often needed at places where load shedding is a common problem. There are two types of inverters, sine wave inverter which is very expensive, and modified inverters which price are inexpensive.

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

An infrared proximity sensor by utilizing IC LM358 with a 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 in 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, the 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, and 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). The darkness Detector circuit can helpful for use in applications where the light will be going 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 Component

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 separate 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.

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 accessible in the market and they produce various kinds of music relying upon their usefulness.

Temperature Controlled DC Fan

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

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 the voltage to a fixed certain level by getting a certain amount of specified input voltage.

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

555 Timer IC Testing Circuit Working Principle

The 555 Timer IC is one of the most popular and most frequently used integrated circuits 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.