Nicolai Sawilla's OSIRIS is an ATmega328PB-based device that can be used as a standalone Geiger counter or dosimeter, a data logger, or even a true random number generator when connected to a PC via USB.

Emanuele Martorelli turned a classic Commodore 64 into an ATmega32U4-powered USB keyboard for modern computers.

For those looking to once again experience the nostalgic sound of chiptunes, Denjhang Liu's PIC18-RESPFM is a RE:birth bus-compatible, four-slot SPFM host implemented on a PIC18F25K22.

DODcircuits' BT110 packages up everything you need to create bytebeat synthesis into an easy-to-use standalone module.

Orbigtech's CosmoX AR1 is an Arduino UNO-inspired development board with an ATmega168PB‑AU at its core.

Antoine Dubreuil's project recreates an Arduino UNO on a breadboard, while exploring ADC and UART and demonstrating how to program a bare ATmega328P using AVR C.

Adam Taylor often turns to Microchip SAM processors for his space developments. In this @hacksterio.bsky.social project, he walks through how to get a simple application up and running on the SAM V21.

ALTco's CALCUTRAC is a custom calculator with a vintage CRT display.

PajoPCB designed an electronic die from scratch using an ATtiny85 and some RGB LEDs — complete with a realistic rolling animation.

The OriRing is an origami-inspired haptic feedback ring that lets wearers realistically 'feel' what they are experiencing in a virtual world.

Wish you could play your MIDI controller more like a guitar? Don't fret. Marcus Stephen Edwards' device lets you do just that!

YouTuber diorama111 added a tiny LCD destination sign to a 1:150 scale N-gauge train using an ATmega328P and an IR remote (with a PIC79603-controlled receiver).

Joren Heit's ATmega328P-powered analog wall clock rotates its entire face to freeze one hand while keeping perfect time.

Markus Bindhammer built an ATmega4809-powered controller to safely activate and launch model rockets.

Francesco Comi created a fully custom 24-quadrant kinetic clock inspired by Humans since 1982's ClockClock 24.

Makers Making Change's Chatterbox is an ATmega328-powered switch scanning AAC device for users with visual impairment: github.com/makersmaking...

Controlled by an ATtiny1614, TomatoCube's I2C IR line sensor module provides a simple and reliable way for detecting a visible path for your robot to follow: github.com/TomatoCube18/i2c_5chLineSensor

Machina Speculatrix designed a 48-pin DIP breakout board for the ATmega4809-A microcontroller: github.com/mspeculatrix...

YouTuber UncleStem constructed an ATmega328-powered Arduino UNO that's 7x the size of the original — and it's fully functional!

This ATmega328-driven microdosing automatic fish feeder uses a screw conveyor mechanism to push out food with precision.

Manual do Mundo built a simple, ATmega328-powered alarm system to protect your drawers, doors, windows, or anything else when someone gets too close.

Mads Chr. Olesen created an ATmega328-powered remote for kids that uses floppy disks to select which show is played on the TV: blog.smartere.dk/2026/01/flop...

Do you hate not knowing when to water your houseplants? Then you'll really dig this ATmega328-powered soil moisture meter!

The UV Paper Printer is an ATmega2560-driven XY plotter for high-wattage UV LEDs to expose cyanotype and other printing methods.

Airrr17's Nano BMP280 shrinks a weather station down to just 13x15x5mm — using an ATtiny85, a BMP280 sensor, and a 0.66″ SSD1306 OLED display: github.com/Airrr17/Nano...

PirBox is an ATtiny3216-equipped device that uses LoRa to extend your smart home far beyond its walls, monitoring gates and sheds where Wi-Fi fails.

This ATmega328P-driven PWM controller turns simple on/off heated socks into the temperature of your choosing.

Designed for primary school education, Robert Sedak's Catch me BCL-1 is an ATtiny85-based module that shows students the advantages of charlieplexing with seven bicolor LEDs.

"My open-source efforts are often focused on bringing functions and features to MCUs that people assume can’t be done." Arduino recently caught up with Larry Bank to talk about his approach to code optimization and why efficiency still matters in a world of increasingly powerful hardware.

YouTuber OVER TUNING gave his Civic G9's dashboard an upgrade with a Formula 1-inspired, ATmega328-controlled shift light.

Mayur Pagote upcycled a Pringles-like container into an ATmega328-powered plant pot, which shows facial expressions on an OLED display depending on moisture level.

David Johnson-Davies' AVR128DB28-controlled Light Lab allows you to experiment with different patterns on NeoPixel or DotStar strips: technoblogy.com/show?5DCO

Beko Pharm's Primary Buffer Panel v2 is an ATmega2560-driven DIY joystick controller with an LCD display and lots of RGB LEDs — designed to be part of a low-cost, full-featured simulated cockpit for playing games like Elite Dangerous, Star Citizen, X4: Foundations, and more.

Patchouli is an open source electromagnetic drawing tablet built from scratch.

Salvatore La Bua designed a custom tail light for his Kawasaki ZR-7 around an ATtiny85: github.com/slabua/zr7-t...

SparkTheImagination's ATmega328-controlled, wheels-free robot can inch its way across the floor.

MAUS is an open source, ATtiny85-based USB mouse jiggler with a customizable RGB personality: www.makersun.net/maus

The PirBox-LITE is a custom, ATtiny3216-equipped LoRa sensor designed for long-range, ultra-low-power smart home applications.

"This isn’t the first ATtiny graphics library to blow our minds."

Colin Pate built a PIC16F1765-powered, handlebar-mounted light for nighttime mountain bike riding.

Max Kendall's Tiny4FSK is a SAM D21G-controlled high-altitude balloon flight computer with built-in tracking using the Horus Binary v2 protocol.

Rick Gessner restored the function of a '60s-era Saab oil monitoring relay with the help of an ATmega328-based Arduino Nano.

Shashwath Sundar turned a telephone into an ATmega328-powered analog drum machine.

Vishal Soni designed a pair of ATtiny85-controlled PCB earrings with animated LEDs as a unique gift for his girlfriend.

Researchers have developed a lightweight, self-powered eye-tracking system that runs off the energy generated from blinking.

Antonin Fourneau’s Waterlight Graffiti is an interactive exhibit that combines two classic childhood toys: the Etch A Sketch and Lite Brite.

Zachary Murtishi's ATtiny3224-controlled project reimagines the ancient Mancala board game with modern electronics.

Víctor Aguilar's GBLink is an ATtiny412-controlled adapter that enables you to communicate with your Game Boy's link port using UART: www.tindie.com/products/vag...

ToSStudio's TinyTFT_LT7683 library enables you to drive a 10″ 1024×600 TFT display using an ATtiny85 over I2C: github.com/ToSStudio/Ti...

YouTuber Marb's lab needed an autosampler for his spectrometer project, so he built his own ATmega2560-controlled setup with a sample carousel.