Los Angeles-based interactive agency Friendly Vengeance is putting up its dukes to “Knock Out Injustice” with the five-day social media fundraising campaign “KO Bots” to benefit L.A. Kitchen.

A pair of Rock ‘em Sock ‘em Robots are ingeniously employed for this charity boxing match, in which the action is entirely decided by Twitter. Participants tweet @KO_Bots with the hashtags #RedBot or #BlueBot to prompt the robot of that color to take a symbolic swing at issues including ageism, food waste and recidivism, then watch the impact of their post by following along in real-time online.

Punches are thrown using a set of servo motors connected to an Arduino Mega capable of reading simple inputs (such as a tweet) and generating an output (in this case, a punch). Friendly Vengeance CEO Steve Tiseo tell us:

To detect a popped up head, we attached a photoresistor below the chin and set a threshold for determining when the bot is “knocked out.” A Python script searches for #RedBot and #BlueBot, and then sends integers to the Arduino to randomize punches via USB serial communication. If a bot’s knocked out, it sends a number back to the Python script to tally a KO on the site.

After playing, users receive a thank you tweet and a link to make a donation. To learn more about the project and its cause, head over to the KO Bots page. The fight will be streaming from December 19 to December 23.

Los Angeles-based interactive agency Friendly Vengeance is putting up its dukes to “Knock Out Injustice” with the five-day social media fundraising campaign “KO Bots” to benefit L.A. Kitchen.

A pair of Rock ‘em Sock ‘em Robots are ingeniously employed for this charity boxing match, in which the action is entirely decided by Twitter. Participants tweet @KO_Bots with the hashtags #RedBot or #BlueBot to prompt the robot of that color to take a symbolic swing at issues including ageism, food waste and recidivism, then watch the impact of their post by following along in real-time online.

Punches are thrown using a set of servo motors connected to an Arduino Mega capable of reading simple inputs (such as a tweet) and generating an output (in this case, a punch). Friendly Vengeance CEO Steve Tiseo tell us:

To detect a popped up head, we attached a photoresistor below the chin and set a threshold for determining when the bot is “knocked out.” A Python script searches for #RedBot and #BlueBot, and then sends integers to the Arduino to randomize punches via USB serial communication. If a bot’s knocked out, it sends a number back to the Python script to tally a KO on the site.

After playing, users receive a thank you tweet and a link to make a donation. To learn more about the project and its cause, head over to the KO Bots page. The fight will be streaming from December 19 to December 23, though tweets can be sent to the robots at any time during the event.

Last December, to wish their clients a Merry Christmas, UK-based agency Kerve Creative decided to do something a bit different than just the traditional holiday card. Instead, they created an interactive one with Arduino that transforms into a fully-functional game controller.

The card invited recipients with a “little ditty” to play the retro-style Hacky Xmas game. After plugging it into your computer’s USB port and pressing either the Mac or PC button (PC may’ve needed to wait for the drivers to update), they could then use the controller to help Santa hack down a Christmas tree, while dodging falling decorations and collecting as many points as they could.

To make things even more merry, the highest scores also won a special prize from the Kerve team which included a lumberjack hat and a bottle of champagne.

You can read more about the awesome project here.

If you really don’t want someone messing with your valuables, a programmable box may be just what you need!

Locking mechanisms generally work using one method—a key, for example—to keep them secure, or perhaps two in certain circumstances. This box, designed as a final project for an electrical and computer engineering class at Cornell, instead makes the user go through four steps to get to the “treasures” inside.

Once the user has input the correct code, set potentiometers to the correct position, knocked on the box in the correct sequence, and finally scanned his or her fingerprint, a solenoid unlatches the box’s. It seems like a great project for an ECE class. On the other hand, the unit is wooden, so if you did forget the authentication procedure, it wouldn’t be too hard to manufacture a literal back door!

A cool idea nevertheless, and certainly something that could help protect your snacks or other items from a sneaky roommate. You can see more about this lockbox on the Cornell-hosted project page.

If you want to eliminate arguments about which toy car is fastest, we’ve got just the project for you.

When one’s kid has a birthday, most people go to the store and buy a gift. Phil Tucker instead decided to build something unique for his two-year-old, an automated Hot Wheels drag strip with an electronic start gate and timer. Like many other gravity race setups, when released, the cars roll to the bottom of a slope.

Tucker’s design, however, releases the cars automatically using a servo and hinge at the press of a button. It then detects the winner using infrared LEDs and light dependent resistors, displaying the results on a miniature marquee. The entire system is controlled by an Arduino Uno.

You can find more on this DIY drag strip here, and see it in action below!

If you’d like to observe certain celestial elements, you could do research and search the sky manually. Or just create a system to do it for you!

This is exactly what Subham Paul has done using an Arduino Mega, a GPS module, and 3.5-turn-pan and 180-degree-tilt servos. The real-time tracking device can predict the position of planets, calculated using Kepler’s Laws.

Data about the celestial body is input into his setup and then precisely pointed it out in the sky with a laser. All of this, of course, is dependent on where the user currently resides, which is taken care of via the GPS module as well as an optional MPU-9250.

As you could imagine, this is naturally an involved project in concept and implementation. You can find an introduction and links to further build steps here.

There’s nothing like a dazzling display of lights to help get you into the holiday spirit. Every year, enthusiasts share the magic of the season by decorating their homes with artfully strung, animated bulbs, while some Makers take their projects to the next level using open-source hardware.

2016 did not disappoint. A quick Google search revealed a bunch of Arduino-controlled LED shows that you’ll want to see!

Did you deck out your house? Share it below! Also, don’t forget to enter your Internet of Holiday Things projects in our latest contest here.

We’ve seen plenty of Arduino-equipped holiday sweaters over the years, but none as teched-out as this one. Last Christmas, UK-based Makerspace fizzPOP and electronics retailer Maplin teamed up to create quite the fun and festive jumper.

The aptly named “Ultimate Christmas Jumper” features an Uno, a Mega, an Adafruit FLORA, four 8×8 LED panels, some NeoPixels, a portable 10,000mAh power bank, as well as a pair of electret microphone amplifiers that enable it to react to sounds.

A sewn-on, 3D-printed fireplace holds the display, which as you can see in the video below, flashes a series of holiday images ranging from Santa, to Rudolph, to season’s greetings.

Want to wear one to your next party? Lucky for you, fizzPOP and Maplin have put together a video tutorial to help get you started!

Air hockey is a classic arcade game consisting of two players, two paddles, a puck, and a low-friction table. But what happens if you don’t have an opponent? If you’re Jose Julio, you build a robotic one out of 3D printer parts.

An updated version of his earlier design from 2014, Julio upgraded the Air Hockey Robot’s original camera and vision system to a smartphone for its eyes and brain. Other components include an Arduino, an ESP8266-based shield, NEMA 17 stepper motors, stepper motor drivers, as well as some belts, bearings, rods, and a few more 3D-printed pieces.

As you can see in Julio’s video below, the robot moves along two different axes with a paddle to cover its half of the table. An Android phone running the Air Hockey Robot EVO app monitors the playing surface, and makes real-time decisions by tracking the puck’s location and predicting its trajectories.

The smartphone’s camera is looking at the playing court. The camera’s captured data is processed in real-time by the smartphone. Detecting the position of the puck and the “pusher robot” (and according to the current location of all the elements on the court), your smartphone makes decisions and commands the robot what to do via Wi-Fi.

Your smartphone will become an augmented reality device, showing predicted trajectories and position of all the objects involved in this game.

Want your own? Julio has made both the instructions and code available to everyone.

Manuel Lukas, a student at the University of Applied Science Mainz, and Sascha Lukas, a student at Cologne University of Music, together make up the German pop band Wyoming. As part of an interdisciplinary project, the duo decided to combine their love for both design and music into one live MIDI controller that’s bigger than commonly available commercial devices, but due to its size, more comprehensible for the audience.

The result? A DJ table, dubbed “Stage Bench,” that doubles as an instrument.

Stage Bench is based on an Arduino Uno which interacts with two matrices, a 128-LED matrix and a 128-button matrix, via a pair of shields. The connection to the computer is managed by serial communication and corresponds with a self-programmed patch in Max/MSP, which also sends MIDI data to any preferred DAW to play instruments or samplers.

Check out Stage Bench in Wyoming’s music video below!