20 Awesome Arduino Projects That You Must Try 2021!

Just got your Arduino but don’t know what to do with it? No worries as today, we have compiled 20 cool Arduino projects to get you started! These 20 projects are carefully handpicked and are some of my personal favourites!

Have no idea what’s an Arduino? You can check out our guide on What is Arduino for an introduction on the Arduino!

What is an Arduino UNO ($24.95)?

For those who do not know what is an Arduino UNO, it is basically the perfect tool to get started with coding, electronics or the Arduino!

Why so?

That is because this board has everything you need to get started and nothing you don’t. It has 14 digital input/output pins (where 6 can be used as PWM outputs), 6 analog inputs, a USB connection, a power jack, a reset button and more. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started.

Not to mention, the Arduino UNO Rev3 is also one of the most commonly used Arduino board within makers and are well documented with a variety of tutorials available online which makes it very suitable for beginners. This also means more projects!

However, if you feel that the Arduino UNO price is on the higher side and considering other cheaper and better alternatives, we highly recommend our:

Seeeduino V4.2 ($6.90) – Alternative of Arduino UNO

Seeeduino V4.2 is an Arduino-compatible board, which is based on ATmga328P MCU that is based on the Arduino UNO bootloader. Not only is it better than the UNO with more features, but it is also much cheaper at $6.90!

  • There’s a switch to choose the system supply voltage, 3.3V or 5V, which is very useful if you want to set the system to 3.3V to save power.
  • In addition, the Seeeduino V4.2 has three onboard Grove interface that can make your board connect to Grove modules easily.
    • For those who do not know what is Grove, Grove is Seeed’s very own modular electronic platform for quick prototyping. Every module has one function, such as touch sensing, creating an audio effect, etc.
    • Many configurations can be assembled without the need for soldering or breadboarding. Just plug in the modules, and you are ready to go!
    • Our standardized Grove connector allows users to assemble Grove units with a building block approach, compared to the jumper or solder based system, it is much easier to assemble or disassemble, which simplifies the learning system for experimenting, building, and prototyping.
  • Compared to the Arduino Uno, the Seeeduino V4.2:
    • Uses a micro USB to power and program the board instead of a regular USB
    • 3 onboard Grove connectors
    • 3.3 / 5 V system power switch
    • DCDC circuit instead of LDO which improves efficiency
    • Improved Circuit
    • Cheaper!

Without further ado, let us jump right into the 20 Best Arduino UNO R3 projects 2020!

20 Awesome Arduino UNO Projects That You Must Try 2020!

1. Arduino Music Instrument

Ref: LanmiLab

Want to use gesture control and handwaves to control your Arduino UNO R3? With this project, you can make that come true! Through this project, you will be using a board called Flick which is a PCB that is able to detect your gestures from up to 15cm away in 3D space. Draw a circle, swipe your hand – Flick will track it.

With Flick, the possibilities are endless! You can now control your computer, TV, music system, and many more with a Flick of the Wrist! In this project, we will be using Flick with the Arduino UNO to create a musical instrument!

What do you need? (Other than Arduino UNO)

Interested? You can check out the full tutorial by LanmiLabs on Arduino Project Hub!

2. Arduino UNO Fingerprint Door Lock

Ref: 卢伟聪

Always losing your keys but do not wish to install a fingerprint door lock due to its high price? What if I told you that you can build your own fingerprint security door lock with only $70! With this project, you do not need to worry about losing your keys anymore as this door opens at the tap of your fingerprints.

What do you need? (Other than Arduino UNO)

If you are interested, you can find the full tutorial by loovee at Seeed Project Hub!

3. Arduino Robot Car

The combination of DC motors and Arduino is always fun. And when it comes to DC motors, one of the many things we can do with them is of course to make a motor car! Through this tutorial, you will learn how to make your own robot car from scratch and control it with the Arduino UNO together with an L298N Motor Driver!

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial on HowtoMechatronics!

4. Arduino UNO Handheld Game Console

Ref: DIYTech

Smartphone & iPad gaming is great and all but nothing can beat the charm of making your own game console and playing with it. Using the UNO you can easily make a game console and develop your own game and play it. In this project, we will learn how to upload and develop the popular “Snake Game” as a demo.

What do you need? (Other than Arduino UNO)

  • Li-Ion Battery
  • ATmega328P Microcontroller
  • 2 x MAX7219CNG
  • Bi-color Dot Matrix Display
  • 6 x Push Buttons / Tactile Switch
  • Grove – Buzzer
  • 5 x 5mm LED
  • 15 x Resistor 10k Ohm
  • 4 x Capacitor 10 pF
  • 2 x Capacitor 1 µF
  • 3 x IC Base
  • 165mm x 73mm PCB Board

If you require basic components like the resistors, LED and capacitor, you can consider our 20 in 1! Basic components mixed pack which contains all the basic components!

Interested in this project? You can check out the full tutorial by Md. Khairul Alam on our project hub!

5. UNO Home Automation

Want to automate your house appliances and make your house smarter? With the help of a simple Android app, the Arduino UNO and few modules, you can control electrical appliances with clicks or voice commands using Bluetooth! Now, you can leisurely sit on your sofa and switch on or off any device without getting up!

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial on electronicsforu!

6. Arduino UNO Car/ Truck Simulator

Inspired by Silas Parker

Do you know there is a technology called CAN (Controller Area Network) can be used to allow microcontrollers and devices like the Arduino to communicate with each other within a vehicle without a host computer that allows for control and data acquisition? Want to find out more? You can check out our guide for an Introduction to CAN-BUS and How to use it with Arduino!

Through this project, we are going to make use of CAN technology and create a car/truck simulator with a real dashboard on your PC with the UNO and a CAN-BUS Shield!

What do you need? (Other than Arduino UNO)

Interested? You can check out the full tutorial at SeeedStudio Community!

7. UNO Universal Remote Control

Do you have multiple remote controls lying around? Want to get rid of them and replace them with just one universal remote? With this project, you can!

Through this project, you will convert an ordinary Keyes infra-red (IR) remote into a programmable universal remote.

What do you need? (Other than Arduino UNO)

Interested in finding out more? You can check out the full tutorial by ScottC on Hackster.io!

8. Laser Tripwire Alarm Security System

Ref: SurtrTech

Security systems are often expensive to set up and also expensive to maintain. Why not create yourself with an Arduino together with a few other modules for less than $30!

Through this project, you will create a laser tripwire alarm system where once the laser beams are cut, the alarm will go off and will not stop until a button is pressed. In addition, you can also set up a passcode to make it even more secure where it now requires a passcode entered into it to stop the alarm.

What do you need? (Other than Arduino UNO)

Interested? You can check out the full tutorial by SurtrTech on Hackster.io!

9. Arduino Weather Station with Nextion Display

Ref: Educ8s

With a Nextion Display, you can build your own weather information system where you can tell the temperature and humidity of the weather easily! If you do not know what is a Nextion display, you can check out our guide on Introduction to Human Machine Interface With Nextion.

With an easy to use the software, you can also easily add more functions and features to your display!

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial by educ8s on Instructables!

10. OLED RTC Clock

Do not want to buy a new clock? Why not build one with the addition of an RTC (Real Time Clock) module to easily make yourself an OLED digital clock with the UNO to show the date, time and day!

Curious about why you need a separate module to keep track of the time when your Arduino already has a built-in timekeeper? Find out the answer in our guide on RTC!

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial on Simple Projects!

11. HX711 and Load Cell Arduino Punching Bag

Ever wonder how much power is in that punch of yours? Why not try making a punching bag with a force gauge to measure the amount of force of your punch in newtons! Through this project, you will learn how to measure your fist power using a load cell and HX711 together with the Arduino.

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial by Electropeak on Arduino Project Hub!

12. DIY Arduino RC Hovercraft

Want to step up your robot car game? Why not build a floating Hovercraft that can be controlled using a remote control!

Find out the science of how a hovercraft is able to be lifted in the air and many more through this project!

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial with complete instructions from 3D printing, circuit diagram to codes on HowToMechatronics.

13. Arduino Ping Pong Game

Related image

Remember this popular retro Ping Pong game? Well, you can build and control it easily with the UNO and a few common components.

What do you need? (Other than Arduino UNO)

Interested? You can check out the full tutorial on Electronicsforu!

14. Wristwatch Walkie-Talkie

Ref: Ric2011A

Want to communicate with your friends in a fun and cool manner? Why not try out this wearable walkie-talkie inspired by the Mighty Morphin Power Rangers!

What do you need? (Other than 2 Arduino UNO)

Interested? You can find the full tutorial for this project by ohoilett on Instructables!

15. Arduino RFID Door Lock

There are many ways to make your traditional door lock go smart from fingerprint, passcode, etc. and also this RFID door lock!

How it works is that if a tag/card is near the scanner, the door will automatically open and after you close it, it will automatically lock. A convenient way! No more fumbling with keys anymore, just tap your card and your door is now opened. Not to mention, its cheap to build as well!

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial for this RFID project on Howtomechatronics!

16. Automated Plant Watering System

Set It and Forget It!
Ref: rbates4

Are you tired of your plants dying and want something to babysit your plants? Going somewhere and unable to take care of your precious plants?

If your answers are yes, this Arduino project will be just for you! With this automated watering system, it will automatically deliver an adjustable volume of water of up to 4 plants every day or once every “x” day whichever you specify (up to seven days). It even comes with artificial sunlight for your plants to grow healthily.

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial by rbates4 on Instructables!

17. Raspberry Pi Arduino Intelligent Tea Sensor

Do you ever find yourself opening up a teabag/coffee container with no tea or coffee beans? This is one of the saddest moments that one could experience so we’ve got a solution to solve it! With this project, we will be building an intelligent tea bag container sensor to estimate the number of tea bags left which will inform us if we start to run out.

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial on All About Circuits!

18. Lightweight Arduino GSM Mobile Phone

Feel like your mobile phone is too heavy for your liking or too costly? Why not try making one yourself that is lightweight and capable of national and international features!

This Arduino mobile phone is able to make calls, receive calls and also send and receive SMS as well. It uses a GSM module to connect to the mobile network and Nextion display to visualize GUI interfaces.

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial by Avishek at Hackster.io!

19. DIY Low-Cost Air Hockey Table

Ref: Technovation Projects

As a professional air hockey setup is usually only available in arcades due to its sophisticated system, it is hard to actually enjoy the gaming experience in the comfort of your own home.

But what if I told you, you can build it yourself easily and at a low cost too! This project is customized and easily scalable where if you want your air hockey table to be of a bigger size, you can!

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial for this project done by Technovation at Instructables!

20. Automated Cocktail Drink Machine

To end it off, we have a cocktail drink machine! This automated cocktail machine is not your everyday alcohol dispensing machine. It consists of 4 different stations to make sure your cocktail tastes as good as what you get in the bar. The stations are:

  • Automated Mint, Sugar, and Lime Muddle for releasing all the flavours
  • Automated Lime Slicer and Dispenser
  • Automated Mint and Sugar Dispenser
  • Automated Liquid Dispenser

With this project, it will definitely satisfy all your alcohol needs 🙂

What do you need? (Other than Arduino UNO)

Interested? You can find the full tutorial for this project done by CamdenS5 on Instructables!


Those are just some Arduino UNO R3 projects to get your brain juices flowing and get started on the Arduino UNO.

If thsee projects aren’t what you are looking for, you can check out Seeed Project Hub, Hackster.io, Instructables or Arduino Project Hub which features over 200+ Arduino UNO projects with source codes, schematics and also DIY instructions!

Here at Seeed, we also offer various Arduino boards like the Nano, MKR1000, Mega, Micro, Pro Mini and many more! Not to mention, we also have our own line of compatible boards called Seeeduino that is very cost-effective.

Looking for Arduino Shields or modules and sensors? We have them too!

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January 2020
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