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.
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.
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.
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.
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 push-pull class AB configuration to get a power of 150W to drive a load of approx 8 Ohms.
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.
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 projects 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.
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.
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.
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 the common problem. There are two types of inverters, sine wave inverter which is very expensive, and modified inverters which price are inexpensive.
A voltage doubler circuit is a type of electronic circuit that charges capacitors through input voltage and switches these charges twice of the voltage is produced at the output as at its input.
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.
Today we are going to build a cool project that is thunder and lightning effect using Arduino. Lightning is the most spectacular part of a thunderstorm. In fact, it is how thunderstorm got its 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 in the air. This expansion then creates a shockwave which turns into an explosive sound. That is called thunder.
Nowadays, watering crops are a normal problem in the agriculture field. It is happening because farmers have 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 a automatic plant irrigation system using 555 timer ic.
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.
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 digital display. Today we will be going to make such type of celsius scale digital thermometer using AT89C51 microcontroller and LM35 temperature sensor.
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.
This project will show you an inverter type Automatic Emergency Light with 12 watt 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 operated through battery backup.
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 a simple 12V to 220V 35W inverter circuit. Inverters are often needed at places where load shedding is the common problem. There are two types of inverters, sine wave inverter which is very expensive, and modified inverters which price are inexpensive.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 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.
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.
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.
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.
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.
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.
Here is the circuit diagram of battery charger circuit using Silicon Controlled Rectifier. SCR can be used in half-wave rectifiers, full-wave rectifiers, inverter circuits, power control circuits, etc.
In this interfacing of GPS with the 8051 circuits, the GPS module calculates the position by reading the signals that are transmitted by satellites.
This pulse width modulation technique is the more efficient way to proceed to manage the speed of our DC motor manually.
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.
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.
This mini-project demonstrates a small Inverter circuit that converts the direct current (DC) to alternating current (AC).
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.
This mini-project demonstrates an FM Radio circuit is a 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.
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.
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.
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.
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
This mini-project demonstrates a circuit is useful in charging the mobiles through USB outlets present in our laptops and PCs. For the charging of your mobile phone, this circuit provides you with a regulated voltage of 4.7 volts.
This mini-project demonstrates a simple up/down fading LED light circuit that can be used in shopping malls, homes, and security applications.
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.
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.
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.
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 to the antenna.
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.
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.
This transistor intercom circuit is a simple two-way intercom circuit that is used for the dual purpose of sending as well as receiving signals.
This is the circuit diagram of simple Toy Piano using 555 Timer IC. It produces different tones or sounds depending on the frequency range.
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.
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.
This article describes a circuit that rotates solar panels. This Sun tracking solar panel consists of two LDRs, a solar panel, a stepper motor, and a microcontroller.
This stun gun circuit is mainly used as a weapon to stun or send shock waves to the target with the intention to weaken or paralyze it.
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.
Here is a mobile controlled garage door opening system. This system uses DTMF technology for controlling the door.
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.
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 signalling purposes.
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.
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.
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.
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.
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.
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.