Tag Archives: uno

Levitate water drops with RGB LEDs and Arduino

via Arduino Blog

Water normally falls from the sky to the ground, the time fountain from hacker isaac879 appears to work much differently. As shown in the video below, water droplets somehow levitate from a circular orange apparatus to a blue one on top.

The trick here is that the water isn’t actually falling up, but appears that way by carefully controlling the flashing of RGB lights using an Arduino Uno. If the lights flash at the same rate as the water drops, they appear to stand still, while if the light is flashed more slowly, they appear to rise.

This is the prototype RGB LED Time Fountain I designed and built. It uses RGB LED strip lights to strobe a stream of water drops to make them appear as if they are levitating. By strobing the different colors out of phase with each other some incredible effects can be created.

An Arduino Uno controls the timing of the RGB strobe and the PWM of the pump. Bluetooth communication was achieved using an HC-05 Bluetooth module and the “Arduino bluetooth controller” app by “Giumig Apps.”

Be sure to check out the video to see it in action, especially the bit around 3:40 where drops appear to rise out of a cup while it’s getting filled with water.

Video game head tracking with Wii Remote camera

via Arduino Blog

While the Nintendo Wii has been on the market for well over 10 years, its controllers continue to provide a variety of tools for hacking. One component you may want to consider for your next hack is the camera from the Wii Remote, which senses the position of nearby infrared light spots and outputs them as X/Y coordinates via I²C.

While that may instantly set off multiple use ideas, if you need inspiration, be sure to check out this setup by Jack Carter. He mounted one of these cameras to the top of a computer screen, and uses it to track an IR LED mounted to the top of his headset.

From there, an Arduino Uno translates this information as joystick inputs to the computer, which is then configured to control an in-game camera as seen in the video here.

Automatic guitar strumming with Arduino Uno and chopsticks

via Arduino Blog

If you like to make music, but don’t consider yourself particularly talented, YouTuber Make It And Fake It has come up with an innovative solution.

Her device uses an Arduino Uno, along with a hobby servo motor to move a pair of chopsticks that holds the pick. This means that the guitar can literally strum itself, and thanks to a small control box, she can even select from one of three rhythm patterns.

If you’re wondering what this could be used for, the answer comes at 1:40 in the demonstration video, where Make It And Fake It is shown drinking tea, playing another instrument, and even texting her mom while still producing music from the guitar. Code for the build can be found on GitHub.

Dotter is an Arduino-powered dot matrix printer

via Arduino Blog

While largely supplanted by more modern forms of printing, dot matrix printers still have their fans. Few, however, are more dedicated than Nikodem Bartnik, who constructed his own model that pulls paper up to 55cm wide and as long as he needs under a gantry that stamps each pixel with a marker.

The device is controlled via an Arduino Uno, which takes input from a Processing sketch running on a computer to obtain the image to be printed.

It uses a pair of stepper motors to advance the paper, as well as a third to position the marker to be stamped. A servo motor pushes the marker down as needed, producing a print that, as seen at 5:15 in the video below, is accurate and stylishly pixellated.

This Arduino infinity mirror lights up to music

via Arduino Blog

Infinity mirrors, which make light appear to stretch to infinity by bouncing light between two mirrors, are incredible to observe. Hacker “Evocate” decided to go the extra mile and not only illuminate the inside of his mirror arrangement, but used an Arduino Uno and a sound sensor to enable it to react to sound.

In addition to this sound sensitivity, a Bluetooth app controls color and brightness, allowing him to customize the device on the fly.

The mirror also has a built-in microphone which detects sound/music and reacts accordingly by generating eye-catching light strobes on the beat of the music! Simply start up the app, connect to Bluetooth and see the magic happen!

If you’d like to build your own, full instructions along with Arduino and app code are available here. Or you can simply check it out in action below!

Robotic playing card dealer made with cardboard

via Arduino Blog

Ruben, aka “Ruubz0r,” a mechanical engineering student, was tasked with building a smart object. As he enjoys card games, he decided to make a playing card distributor.

The resulting device uses a single servo to slide cards off of a deck, along with a stepper motor and ultrasonic sensor to aim it at the human recipient. An Arduino Uno provides the brains of the operation.

The system is made out of wood and cardboard, and while it may not be ready for casino use, it’s a great example of what can be done with readily available materials. Check it out in action in the video seen here!