Monthly Archives: June 2020

Arduino-based inkjet printer slowly but surely gets the job done

via Arduino Blog

As a prototype for a continuously printing art project, Norbert (AKA “HomoFaciens”) has built an inkjet printer that uses an Arduino and the mechanics of a discarded 3D printer to slowly generate black and white images. 

The hacked together assembly mounts the Uno, associated electronics, and an HP 6602 cartridge onto a piece of hardboard, which is attached to the X-axis assembly of the former 3D printer. 

Print height is set by manual manipulation of the Z-axis. The Arduino can then move the printer in the X/Y direction via the two steppers, and print by passing current to the cartridge’s nozzles in short bursts. 

“The electronics consist of a computer power supply that provides 12V DC, a boost-up converter that raises this voltage to 18V, an Arduino UNO that generates the control pulses and two ULN2803 chips that convert the 5V of the GPIOs to 18V level.”

As seen in the video below, the contraption appears to work well after some experimentation. 

Stare up at your own ceiling starscape

via Arduino Blog

Have you ever looked up at your ceiling and wondered how to make it a bit more interesting? Well, creator Centas has and decided to bring a piece of the galaxy into his room using a fiber optic star display.

The installation is powered by an Arduino Mega, and features approximately 1,200 points of light along with sound-reactive LED strips around the perimeter.

User interface is handled by a second Arduino and a pair of nRF24L01 transceivers, while PCA9685 boards are implemented to control LED brightness levels. The system can even pulse with music, thanks to an MSQ7EQ chip.

You can see it in action in the video below and find more images over on Imgur. Note that the constellation lines were added in video production for clarity.

Stuffed animal gets its own music/AV box

via Arduino Blog

Er13k was inspired to create an Arduino music box to go along with his girlfriend’s giant stuffed dog Tobias. This eventually morphed into something that not only plays songs on its own speaker, but also lights up a 3D-printed keyboard with LEDs. Perhaps its coolest feature, though, is that it includes an RCA output jack to show a cartoon representation of the plush toy on a CRT television.

When the AV output is active, the device pushes tunes through the TV’s speaker and displays 95×95 pixel drawings and simple animations. 

You can see it demonstrated in the video below, as well as some of the build process. On his “channel,” Tobias gets hungry, makes a drawing, and… becomes quite unsatisfied with his job.

This Mad-Eye relies on Arduino, not magic

via Arduino Blog

In the Harry Potter series, professor Alastor Moody is known for wearing a very distinct prosthetic eyeball that moves in a “mad” manner. When Instructables member replayreb’s son decided to go to a costume party dressed as this character, he took the opportunity to make a replica for him

The device is controlled by an Arduino Uno stored in a wearer’s pocket and transmits signals to the eyepiece via a 3.5mm stereo jack. A servo then actuates half of a ping pong ball decorated with an iris and pupil to create the Mad-Eye effect. 

A potentiometer is also hooked up to the Uno, allowing the mock Moody to complement the motion of the fake eye with the one that’s exposed.

This magnetic board emits light and sound as a marble moves

via Arduino Blog

Andrei Erdei recently designed an amazing Arduino-powered light board, which glows and plays sounds based on the movement of a magnetic marble. 

First, the magnet is placed on top and then made to roll by lifting the device’s sides. An array of 36 reed switches underneath the smoked plexiglass surface detect the magnet’s position, lighting up 36 RGB LEDs in response. There’s also a small speaker for audio effects.

Erdei has created several applications for his light board, including a tester, light chase game, paint, and even a musical sequencer. 

You can see it demonstrated in the series of videos shown below, and code is available on GitHub.

A DIY Deichkind-inspired tetrahedral LED hat

via Arduino Blog

After mechanical engineer “Kuchbert” saw the hip-hop/electropunk band Deichkind perform — wearing LED-embedded tetrahedral hats, no less — he decided he wanted his own glowing geometric headpiece. Now, nearly 10 years and several shows later, he finally got his wish by constructing one out of acrylic triangles with 156 WS2812Bs.

An Arduino Nano controls the device, which links up to an Android app via an HC-06 Bluetooth module, while a portable USB power bank keeps things running.

More info on the fun project is available in Kuchbert’s article. You can also see this brilliant head covering demonstrated in the video below.