Custom Dog Door Prevents Culinary Atrocities

Riley, an 8 lb pug, has more beauty than brains, and a palate as unrefined as crude oil. While we hate criticizing others’ interests and tastes, his penchant for eating cat poop needed to sto…

Arduino Turned Into Something Kinda Like A Pager

Video may have killed the radio star, but cell phones and smart phones all but killed the pager. They still exist, of course, but only in very niche applications. [João Santos] wanted a pager-like …

Tetris Goes Round And Round

You’ve probably played some version of Tetris, but [the Center for Creative Learning] has a different take on it. Their latest version features a cylindrical playing field. While it wouldn&#8…

Change The Jingle In Your Makita Charger Because You Can

Lots of things beep these days. Washing machines, microwaves, fridge — even drill battery chargers. If you’re on Team Makita, it turns out you can actually change the melody of your cha…

Arduino Provides No Fuss SNES-To-USB Conversion

Even for those of us who are fans of retrocomputing, it’s fair to say that not everyone plays their old-school games on real old-school hardware. The originals are now fragile and expensive, …

Don’t Panic: A Cooperative Bomb Defusing Game

[Heath Paddock] wanted to confound his friends with a game that mimics an escape room in a box. About six months after starting, he had this glorious thing completed. It’s a hardware version …

Arduino, Virtually

While simulating an Arduino isn’t a new idea, a recent project by [LRusso] provides an open source JavaScript simulator that runs in your browser. You can try it out live or host it yourself …

Remote-Control Kinetic Sand Table Uses A Single Arduino

There’s nothing fun about a Sisyphean task unless you’re watching one being carried out by someone or something else. In that case, it can be mesmerizing like this Arduino-driven kineti…

The ScottoKatana Keyboard Is Cutting-Edge

The lovely thing about a hobby like keyboard building is that the melting pot of designs manages to never turn into a nasty porridge. Rather, it remains a tasty chili that keeps getting more flavor…

CH32 RISC-V MCUs Get Official Arduino Support

Like many of you, we’ve been keeping a close eye on the CH32 family of RISC-V microcontrollers from WCH Electronics. You can get the CH32V003, featuring 2 kB RAM and 16 kB of flash for under …

Flashlight Door Lock Is A Bright Idea

There are many ways to lock a door. You could use a keypad, an RFID card, a fingerprint or retina scan, Wi-Fi, Bluetooth, the list goes on. You could even use a regular old metal key. But none of t…

A High-End Studio Multiplexer Surrenders To An Arduino

The equipment used in professional radio and TV studios is both extremely high quality and very expensive indeed, and thus out of the reach of an experimenter. Happily as studios are refurbished th…

Ultra-Basic Thermal Camera Built Using Arduino Uno

Thermal cameras can cost well into the five-figure range if you’re buying high-resolution models with good feature sets. New models can be so advanced that their export and use is heavily con…

VU Meter Built With Neat Graphical VFD Display

VFD displays are beloved for their eerie glow that sits somewhere just off what you’d call blue. [mircemk] used one of these displays to create an old-school VU meter that looks straight out …

Arduino Measures Remaining Battery Power With Zero Components, No I/O Pin

[Trent M. Wyatt]’s CPUVolt library provides a fast way to measure voltage using no external components, and no I/O pin. It only applies to certain microcontrollers, but he provides example Ar…

Robotic Rose Of Enchantment Drops Petals On Command

In Disney’s 1991 film Beauty and the Beast, an enchantress curses the young (10 or 11-year-old) prince to beast-hood for spurning her based solely on her appearance. She gives him a special r…

1D LED PONG, Arduino-Style

Maybe it’s just us, but isn’t it kind of amazing that in a world of pretty darn realistic games, PONG is still thrilling to play? This 1D implementation by [newsonator] is about as exci…

Capacitive Rainmeter Measures The Sky Water Just Fine

If you’ve got a smart home, or you just want to know how soaked your garden is getting in the winter, you might want to measure rainfall. There are a bunch of ways to go about it, and this ca…

Watch Time Roll By On This Strange, Spiral Clock

[Build Some Stuff] created an unusual spiral clock that’s almost entirely made from laser-cut wood, even the curved and bendy parts. The clock works by using a stepper motor and gear to rotat…

Arduino Sticker Dispenser Saves Time

What’s the worst part about packaging up a whole lot of the same basic thing? It might just be applying the various warning stickers to the outside of the shipping box. Luckily, [Mr Innovativ…