Monthly Archives: July 2020

Juuke is an Arduino-powered RFID music player for the elderly

via Arduino Blog

While many of us take playing tunes for granted, whether via MP3s, CDs, or streaming services, for others — such as many that are very young or old — actually figuring out the interface can be a challenge. To make it easier for the elderly (and children) to enjoy music, Ananords and his girlfriend created the Juuke box.

The Juuke features an RC522 RFID reader to trigger specific songs stored on an SD card via a DFPlayer Mini, using a stereo jack and external powered speakers. The device is controlled by an Arduino Uno, and includes a volume potentiometer along with two light-up buttons — red to play/pause tracks, green for random playback.

Code for the project can be found on GitHub, with 3D print files, and the actual Fusion 360 files are also available if you’d like to build your own.

The PongMate CyberCannon Mark III is a surefire way to never lose at beer pong

via Arduino Blog

If you participate in beer pong, and your skills aren’t up to the challenge, you might be in for a rough time. While “practice makes perfect,” if you’d rather shortcut this process then engineers Nils Opgenorth and Grant Galloway have just the solution with their Arduino-powered PongMate CyberCannon Mark III.

This wrist-mounted launcher uses a time-of-flight sensor, along with an inertial measurement unit to calculate the vertical and horizontal distance to the red Solo cup, marked with a small laser. Bubble levels help users fix the device in the horizontal direction and five programmable RGB LEDs indicate when it’s ready to shoot.

To fire, it pushes a ball forward using a small servo, which is then flung out using a pair of spinning wheels. Distance is set by varying the speed of driving motors, in order create the appropriate shot velocity.

Dave Darko designs a 16-button keep-alive switch with a Nano Every

via Arduino Blog

It’s generally not advisable to leave equipment running when unattended. As a safeguard against this possibility at hackerspaces and elsewhere, element14 Presents’ Dave Darko built a custom switch that requires users to intermittently push a button in order to produce additional ‘on’ time.

The trick here is that instead of having one keep-alive button, the unit has a matrix of 16 buttons that light up randomly to be pressed. The idea is to prevent someone from setting up a second device to simply poke the same key over and over.

The ‘unhackable’ switch, which resembles a MIDI sequencer input, runs on an Arduino Nano Every and uses a relay to directly control the power state. It’s demonstrated toward the end of the video below, where Darko plays a sort of simple button-based game to keep an LED fixture on.

PULSE: A pendant to warn you when you touch your face

via Pololu Blog

PULSE pendant by JPL.

PULSE is a 3D-printed wearable device designed by JPL that vibrates when a person’s hand is nearing their face. It’s based around our 38 kHz IR Proximity Sensor, and was designed to be relatively easy to reproduce (it doesn’t require a microcontroller or programming, but you do need access to a 3D printer to make the case). The project is open-source hardware, with complete instructions, design files, and a full parts list available on GitHub.

These are the parts that can be purchased from Pololu:

Here’s a short demo of our intern Curtis using a PULSE pendant he made himself:

You can find more information about the PULSE pendant on the PULSE website.

Mechanical 7-segment display made using electromagnets

via Arduino Blog

When you think of a “7-segment” display, your mind naturally goes to something involving LCD or LED technology. As seen here, however, this 0-9 pattern can also be duplicated mechanically using a series of electromagnets.

Neeraj Rane’s 3D-printed device is controlled by an Arduino Nano, along with a shift register. These activate seven hand-wound coils that push the magnet-embedded segments in and out, via a series of IRF540N MOSFETs.

As of now, the display simply cycles through numbers. If a few more digits were added, and perhaps a user interface and/or an RTC module, it could form the basis of an even more interesting project. Check it out in action below!

This Arduino-powered machine folds your shirts at the push of a button

via Arduino Blog

Inspired by an old FlipFold TV ad, YouTuber Ty Palowski decided to make his own automated shirt folding machine.

Palowski’s device is made in four folding sections, which lie flat to accept the unfolded piece of laundry. When the shirt is properly placed, a capacitive touch sensor starts the process, which is controlled via an Arduino and motor drivers.

Two motors bring in the sides sequentially, then a third motor flips the bottom up. Activation is based simply on timing, with no sensor feedback. As seen at the end of the video, the project does save folding time and it works even better once Palowski gets some practice with it!