What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Arduino Day is a chance to share what you can make with a programmable board, from a simple button-and-buzzer instrument to a connected greenhouse. Here are 20 ideas organized by what they do: the first 10 are named winners of Arduino’s 2021 Community Challenge; the other 10 are broader ideas listed in Arduino Project Hub, not Arduino Day winners.
The 2021 challenge received more than 170 entries, according to Arduino’s recap. Project Hub is a changing community catalog, so treat its listings as starting points and check each project’s current instructions and parts before building.
Sensing and monitoring
1. Project Seismon
2021 Community Challenge winner — Swara Kadam. This robot-styled concept is intended to help schools detect and respond to earthquakes, warnings, and preparedness drills. It can inspire a school safety or sensing project, but the recap does not establish that it is a certified warning system or suitable for life-safety decisions. Arduino’s 2021 winner recap
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →2. IoT High Tech Mini Greenhouse
2021 Community Challenge winner — Maciej Gala. The project pairs a greenhouse concept with IoT and a lighting system. Arduino’s recap suggests the idea can scale to gardening applications, but does not specify a sensor list or detailed automation behavior. Arduino’s 2021 winner recap
#1 Best Overall
- 35+ Guided Electronics Projects: Progress from LEDs and buttons to RFID access, real-time clocks, motion and distance sensing, environmental monitoring, motor control and interactive displays for STEM learning, coding clubs and maker projects
- More I/O and Memory for Larger Builds: The MEGA 2560 R3 provides 54 digital I/O pins, including 15 PWM outputs, 16 analog inputs, 4 hardware serial ports and 256 KB flash for projects that combine more sensors, controls and displays
- 200+ Components for Prototyping: Includes LCD1602, RC522 RFID, RTC, DHT11, HC-SR501 PIR, ultrasonic and water-level sensors, GY-521, MAX7219, keypad, joystick, rotary encoder, relay, SG90 servo, stepper motor, DC motor, breadboard and more
- Learn, Modify and Create: Follow 35+ guided lessons with example code, then adjust sensor thresholds, timing, display text, motor behavior and control logic to turn structured exercises into access systems, monitors, alarms and interactive projects
- Organized for Repeatable Learning: Pre-soldered modules, a solderless breadboard, storage case and small-parts box reduce setup time and keep sensors, LEDs, ICs, wires and other components easy to find between projects
3. Smart weather station
Broader Arduino idea. Build a station that collects and presents weather-related readings. Arduino’s beginner roundup includes a DIY weather-station project, and the Plug and Make Kit guide also lists a weather forecast station among its guided examples. The exact parts and capabilities depend on the tutorial you choose. Arduino’s beginner project roundup · Plug and Make Kit project overview
4. Ultrasonic radar display
Broader Arduino idea. Combine proximity sensing with a visual display to make nearby objects easier to observe. Project Hub lists an Arduino-and-Processing radar showcase; check its individual instructions for the sensor, wiring, software, and code before choosing parts. Arduino Project Hub
5. Parking distance detector
Broader Arduino idea. A distance detector can turn proximity readings into an alert, making this a practical way to explore sensing and feedback. Project Hub lists a parking-sensor project, but its catalog listing alone does not establish the exact parts or performance. Arduino Project Hub
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 116. Smart irrigation system
Broader Arduino idea. Use a soil-focused sensing project as a starting point for deciding when a plant needs attention or watering. Project Hub lists “Soil Knows Best: Build a Smart Irrigation System with Arduino Uno”; consult that project’s instructions for its actual components and setup. Arduino Project Hub
Rank #2
- TURN CODE INTO REAL-WORLD RESULTS — Follow 22+ guided lessons to make LEDs blink, read temperature and distance, move servo and stepper motors, control an LCD and respond to joystick or IR input; ideal for a family weekend build, homeschool unit, coding club or STEM classroom
- MORE PROJECT VARIETY IN ONE ORGANIZED KIT — Includes the UNO R3 controller, LCD1602 with pre-soldered header, breadboard power module, ultrasonic and DHT11 sensors, joystick, IR receiver and remote, SG90 servo, stepper motor, relay, DC motor, fan blade, displays, LEDs, buttons, resistors and jumper wires
- START WITHOUT SOLDERING — Plug-in modules, a solderless breadboard and the pre-soldered LCD help beginners focus on wiring, code and testing; the illustrated component list makes it easier to find each part and move from one lesson to the next
- LEARN THE LOGIC, THEN CREATE YOUR OWN — Use Arduino IDE and the included example code to understand digital input and output, analog sensing, timing, motor control and display functions, then change thresholds, speeds and sequences for alarms, environmental monitors, reaction games and motion projects
- CLEAR SETUP SUPPORT FOR FIRST-TIME BUILDERS — Download the latest tutorial and code, select the UNO board and correct computer port, check component polarity and breadboard rows, and keep power-module input at 9V or below; younger learners should work with an experienced adult
Motion, robotics, and mechanisms
7. Gear Machine Project
2021 Community Challenge winner — James Clarke. An Arduino Micro powers a modular gear machine, combining mechanical design with electronic control. It is a good choice if you want the visible movement of gears to be part of the project rather than hiding the mechanism inside an enclosure. Arduino’s 2021 winner recap
8. Orguino
2021 Community Challenge winner — Johan Halmen. An Arduino MKR1010 and 61 servos automate an organ built in 1902. The project connects modern control electronics to a historic musical instrument; its unusually large actuator count makes it an ambitious example, not a small starter build. Arduino’s 2021 winner recap
9. Interactive robot desk buddy
Broader Arduino idea. Make a small robot that responds to its surroundings or to user input, then give it a personality through its movement or interaction. Project Hub lists a robot desk-buddy idea; the listing does not by itself establish a parts list or difficulty. For a separate beginner robot reference, Arduino describes Otto the dancing robot as using a Nano Every, micro servo, and buzzer. Arduino Project Hub · Arduino’s beginner project roundup
Recommended Free Tools
10. Joystick-controlled football goalkeeper
Broader Arduino idea. Build a game in which a joystick controls a goalkeeper’s movement. It offers a way to explore how physical input can control motion, with the scale and mechanism determined by the project instructions you follow. Arduino Project Hub
Rank #3
- 30+ Guided Electronics Projects: Start with LEDs and build toward LCD1602 displays, RFID access, motion detection, distance sensing, motor control and environmental monitoring for STEM learning, coding clubs, classrooms and hobby projects
- 200+ Components Across 63 Types: Includes an ELEGOO UNO R3 controller, LCD1602, RC522 RFID, RTC, HC-SR501 PIR sensor, ultrasonic sensor, DHT11, GY-521, MAX7219, keypad, joystick, relay, SG90 servo, stepper motor, breadboard and more
- Begin Without Soldering: Pre-soldered modules, a solderless breadboard, organized storage case and small-parts box reduce setup time and help beginners move from lesson to lesson while keeping LEDs, ICs, wires and sensors easy to find
- Learn, Modify and Create: Program the ELEGOO UNO R3 board with Arduino IDE using the included PDF tutorial and example code, then adjust sensor thresholds, timing, display text and motor behavior to turn guided lessons into original projects
- Flexible Power and Project Setup: Includes a 9 V, 1 A power supply, breadboard power module, 9 V battery and USB cable to support controller, breadboard and module experiments without sourcing basic setup accessories separately
11. Smart Pull-Up Bar
2021 Community Challenge winner — Nikolas Babetas. Arduino’s recap describes a laser trigger that detects when someone grips the bar and starts a motivational dispenser or music response. The recap does not provide enough detail to infer additional features or validate it as exercise equipment, so treat it as an interactive prototype concept. Arduino’s 2021 winner recap
Music and interaction
12. Fidget Muse
2021 Community Challenge winner — Indigo Knecht. This fidget-cube-inspired device uses Arduino Nano controls to explore multiple inputs and outputs. It is a useful prompt for designing a compact object where each control produces a different response. Arduino’s 2021 winner recap
13. DIY synthesizer
Broader Arduino idea. A synthesizer turns electronic inputs and control logic into sound, making it a natural project for experimenting with music and interaction. Project Hub lists a DIY synthesizer; check the specific tutorial for its components, code, and audio output method. Arduino Project Hub
14. Retro-style MP3 player
Broader Arduino idea. Build a music player with a retro-inspired interface. Project Hub lists an MP3-player build, but media support, storage, controls, and exact parts are tutorial-specific; verify those details before sourcing components. Arduino Project Hub
Rank #4
- All-in-One Starter Kit for Beginners: Part of the Powered by Arduino program, this kit includes an original Arduino UNO R4 WiFi, 300+ high-quality components, 50+ hands-on projects (30 basic, 13 fun, and 8 IoT), and 100+ free video lessons co-created with renowned educator Paul McWhorter. Designed for beginners ages 8+, it provides a complete, step-by-step path to learn Arduino, electronics, coding, and IoT. RoHS compliant for added safety and quality, it also makes a thoughtful gift for tech enthusiasts, students, and aspiring makers for birthdays, holidays, and special occasions
- Powerful Arduino Uno R4 WiFi Board: Upgraded from the Arduino Uno R3, the Arduino Uno R4 WiFi features a 32-bit processor, more memory, and built-in WiFi and Bluetooth, enabling connection to third-party apps for more interactive and practical projects.
- 300+ Components for Endless Possibilities: With 300+ components and sensors, this kit is perfect for portable projects. It features step-by-step tutorials, open-source code, and compatibility with other Arduino boards like Uno R3 and Nano, offering endless customization and learning opportunities.
- Engaging Projects for Every Skill Level: Featuring 50 projects (30 basic, 13 fun, 8 IoT) with IoT app integration like Arduino IoT Cloud , this kit supports Arduino C++ programming, making it perfect for students, teachers, and engineers to learn, code, and create at any skill level.
- Dedicated Support for Beginners: Alongside online resources and video tutorials, SunFounder provides technical support and troubleshooting forums to help beginners solve programming challenges with ease.
15. Arduino button piano
Broader Arduino idea. A beginner-style piano uses push buttons, a buzzer, and LED indicators to connect physical controls with sound and visual feedback. Project Hub lists this kind of build; use its project page to confirm wiring and code. Arduino Project Hub
16. Elevator Project
2021 Community Challenge winner — Federico Magnelli. This project sends remote commands through Telegram to an Arduino and demonstrates controlling connected lights, motors, or audio. It is an example of connecting a messaging interface to physical outputs; the recap does not specify a complete build recipe. Arduino’s 2021 winner recap
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Home automation, access, and puzzles
17. Fingerprint Door-Lock
2021 Community Challenge winner — Anvesh Pathak. The demonstration uses an Arduino Uno, fingerprint sensor, and a servo in a model house to create a keyless-lock concept. It is a prototype, not evidence of security performance for a real door. Arduino’s 2021 winner recap
18. Smart Trash Can
2021 Community Challenge winner — Carmen Cheung. A contactless lid makes this a straightforward example of automating a small everyday task. Arduino’s recap identifies the project but does not give a detailed parts list. Arduino’s 2021 winner recap
Best Value
- The most economical kit comes with everything compatible with Arduino to starting programming for beginners .
- This is the upgraded starter kits come with a 9V 1A Power Adapter (At least $5.99 on amazon) to replace a 9V Battery , and the Lcd1602 module come with pin header(not need to be soldered by yourself).
- Include High Quality Base Board base on Arduino UNO R3 compatible with Arduino IED and Sensors, Servo, Motor, ULN2003 driver board, lcds, etc.
- Free PDF Tutorial and Datasheet are available to download from our official website or you can contact our customer service.
- All of the Components and Integrated Circuits are individually packaged and labeled, and packing in a plastic box which is bigger enough for you.
19. Chess Board Puzzle
2021 Community Challenge winner — Anastasis Malakozis. A lock opens when chess pieces are placed in the right arrangement. The idea joins a familiar board game with a physical puzzle mechanism; consult the project information before assuming how the board detects the pieces. Arduino’s 2021 winner recap
20. Plug-and-play timer or game controller
Broader Arduino idea. If you want a guided route rather than sourcing each component independently, Arduino’s Plug and Make Kit includes an UNO R4 WiFi, seven Modulino sensors and actuators, and seven step-by-step project guides, including a timer and game controller. Arduino says the kit’s connections avoid breadboards, jumper wires, and soldering; that convenience applies to this kit’s setup, not to every Arduino build. The kit’s listed Modulino components are Knob, Pixels, Distance (time-of-flight proximity sensor), Movement, Buzzer, Thermo (temperature and humidity), and Buttons. Arduino’s Plug and Make Kit overview
How to choose a project
- Pick the outcome first. Choose sensing for a weather or parking display, movement for a robot or gear machine, sound for an instrument, or a physical interaction for a lock or puzzle.
- Check the build instructions, not just the title. Project Hub is community-contributed and its live catalog does not guarantee consistent difficulty, completeness, or current parts availability. Open the individual project page and confirm its creator, components, code, and steps before buying anything.
- Match the board and components. Projects in this roundup mention boards including Uno, Nano, Micro, and MKR1010. Compatibility depends on the specific board, voltage, connector, library, and power needs; do not assume a part used in one build will work with every Arduino board.
- Choose a guided kit only if it suits your goal. Arduino’s Plug and Make Kit is one documented guided option, with seven projects and seven Modulino components. Its simplified connections do not mean it is the best fit for every project or that every idea here can be reproduced with that kit alone.
- Keep prototypes in their lane. The lock, earthquake-response, and exercise-related concepts are inspiration projects; the available descriptions do not establish security, emergency-warning, or equipment safety certification.
Arduino’s official event page describes Arduino Days as a free online event and invites community participation. It listed March 27–28, 2026, dates that have passed; check the Arduino Days page for current event information rather than relying on those dates for a future celebration.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
