Posts with «nano» label

Make your own MIDI keyboard matrix (or just buy one?)

If you’ve ever seen a MIDI pad with dozens of light-up buttons producing electronic music, you may have considered building one using an Arduino. As shown in GreatScott!’s latest write-up, you can indeed create your own Novation Launchpad-like device using a Nano for control, but the real question is should you?

In the video below, GreatScott! shares how made a 6×6 pad, using a 3D-printed body and buttons arranged in a matrix to save I/O, along with WS2812B LEDs. He also goes over the MIDI protocol, which he was able to implement using loopMIDI and Hairless MIDI to serial bridge for Arduino interface. 

While the DIY option may or may not be right for you, the concepts presented could be applied to a wide range of electronic musical interface projects.

In this episode of DIY or Buy I will be showing you how I created my own Launchpad. That means I will show you how I combined a design idea with 3D prints, WS2812 LEDs, tactile switches and an Arduino to create a proper MIDI instrument. While building I will also tell you a bit about a keyboard matrix and in the end determine what advantages the DIY Launchpad offers. 

Mechanical tulip is a glowing work of Valentine’s Day art

Tulips come in all shapes and sizes, but Jirí Praus has created a mechanical version like nothing you’ve ever seen. It’s masterfully crafted as a gift for his wife, using bent wire to form its six petals and stem. 

In order to make this present truly amazing, however, a servo-driven linkage system opens up the tulip when touched, exposing seven programmable LEDs in the center, along with 30 bright white SMD LEDs on the petals themselves.

Control for the freeform flower is accomplished via an Arduino Nano, hidden inside its wooden base. It’s a truly spectacular build, shown below illuminating the surrounding area with a brilliant light and shadow pattern.

It’s done! Mechanical tulip as a present for my wife. When caressed it blooms into various colors. And will never fade. #freeform #jewelry #arduino pic.twitter.com/yDePeURXXd

— Ji?í Praus (@jipraus) February 12, 2019


Versatile multimeter made with Arduino Nano

If you ever wondered about building your own multimeter, YouTuber Electronoobs shows us just how to do so with an Arduino Nano.

Aside from the Nano, he’s using a 128×64 OLED screen to display stats and battery level, and a 16-bit ADC for precise measurements. Power is provided by a small onboard LiPo battery, and he’s even included a charging module to help keep things topped off. Everything is housed inside a custom 3D-printed case. 

The device doesn’t just measure voltage, resistance, and current, but is capable of reading capacitance and inductance as well—measurements that you wouldn’t necessarily expect on a commercial meter. If you’d like to create your own, the schematic and code are available on Electronoobs’ site.


Arduino Nano turned into universal IR translator

After purchasing a new television, maker Andreas Spiess’ remote no longer worked seamlessly with the controller his family had been using. While a universal remote could have solved the problem, in order to keep things simple to use, he instead came up with an infrared “babel fish” signal translator—named after the language translation animal Hitchhiker’s Guide to the Galaxy’s.

The device receives infrared signals from the original remote, then uses an Arduino Nano to pass the properly translated pulses on to his TV and receiver. A 3W IR diode transmits these new signals with the help of an N-channel MOSFET, giving it enough power to control each component, even without the proper line-of-sight orientation. 

It’s a hack that could be useful in many situations, and Speiss goes over how it was made, along with design requirements in the video below.

Automatic eye protection triggered by sound

Görkem Bozkurt has a bit of a problem. When he gets going with a build, sometimes safety glasses are forgotten in the excitement of making something new. While understandable, this doesn’t make things any less dangerous, so he came up with a novel idea to put on his safety specs on automatically.

His wearable creation attaches an Arduino Nano and a MAX4466 electret mic amplifier to the top of a previously normal hat, along with a small servo connected to a pair of lens below the bill. If a loud sound is heard, the goggles are lowered by the servo in response. They’re then retracted when the noise, and hopefully the danger, is gone. 

While the system is still very much a work-in-progress, it’s an entertaining concept that Bozkurt hopes to develop further.

Custom Jig Makes Short Work of Product Testing

When you build one-off projects for yourself, if it doesn’t work right the first time, it’s a nuisance. You go back to the bench, rework it, and move on with life. The equation changes considerably when you’re building things to sell to someone. Once you take money for your thing, you have to support it, and anything that goes out the door busted is money out of your pocket.

[Brian Lough] ran into this fact of life recently when the widget he sells on Tindie became popular enough that he landed an order for 100 units. Not willing to cut corners on testing but also not interested in spending days on the task, he built this automated test jig to handle the job for him. The widget in question is the “Power BLough-R”, a USB pass-through device that strips the 5-volt from the line while letting the data come through; it’s useful for preventing 3D-printers from being backfed when connected to Octoprint. The tester is very much a tactical build, with a Nano in a breakout board wired to a couple of USB connectors. When the widget is connected to the tester, a complete series of checks make sure that there are no wiring errors, and the results are logged to the serial console. [Brian] now has complete confidence that each unit works before going out the door, and what’s more, the tester shaved almost a minute off each manual test. Check in out in action in the video below.

We’ve featured quite a few of [Brian]’s projects before. You may remember his Tetris-themed YouTube subscriber counter, or his seven-segment shoelace display.

[via r/Arduino]

Hack a Day 02 Feb 09:00

Three voltmeters combined into one clock any engineer would love

Apparently not satisfied with available timekeeping devices, ElegantAlchemist crafted a unique clock using an Arduino Nano, an RTC module, and three formerly 1000VAC analog meters. 

The first order of business for the build was converting the meters into something that could traverse its range with only 5V, accomplished by replacing the stock resistor, diode, and capacitor with a 2.2kohm resistor.

Now controllable via Arduino, new faceplate labels were designed in CorelDraw for a very professional look. Everything was encased in an aluminum stomp box enclosure—actually several as multiple clocks were constructed—and RGB LEDs were also added behind each display. 

Code for the project is available here, and more info can be found in this Imgur set.

Arduino-powered omni robot gets an upgrade

When we last saw this omni robot by Jeremy S. Cook, it was lurching around under Arduino Nano and Bluetooth command. After much work, he finally has it to a state where it rolls nicely on a flat surface—even carrying a little strandbeest at just after 8:30 in the demo video.

The biggest revision for the robot was new “grippier” wheels, but electronics were also enhanced, including a LiPo battery (with a voltage divider monitoring circuit), potentiometer for speed control, and LED eyes. 

Changes were facilitated by a screw terminal board attached to the Nano, which minimized solder work, while keeping the robot’s wiring secure. More details and code are available here, while the upgrade/troubleshooting process can be seen in the video below.

Motorize a manual standing desk

Martin Mihálek took the leap into standing desks, and purchased a SKARSTA table from IKEA. Although being able to adjust things by hand is useful, who wants to do that nowadays? Instead of manually cranking it every time, he—with help from iLLiac4—decided to augment it with a motor in order to lower and raise things as needed.

Initial experiments used a FIXA electric screwdriver (also from IKEA) to power the SKARSTA, but he eventually settled on a DC gearmotor, attached to the desk via a 3D-printed assembly

Two versions are described in the project’s GitHub write-up; one employs an H-bridge board for control, the other uses relays. Both are controlled by an Arduino Nano. A keypad allows for calibration and three stored heights, while current position and feedback are shown on a TM1637 4-digit 7-segment display.

See ‘n Say toy hacked with Arduino

The See ‘n Say is an educational toy that originated in the 1960s, speaking out whatever the child pointed to on a dial. The device has evolved over the years from a mechanical sound mechanism to one that uses electronics in its design, which inspired Andrei Aldea to convert one of them into an EEV Blog catchphrase machine!

Aldea replaced most of the electronics with an Arduino Nano, plus an MP3 module to power the speaker. Internal buttons that normally trigger sounds based on the dial rotation, along with a “page” switch, are wired into the Arduino. The hacked toy can now select from a library of over 300 audio clips of host Dave Jones and other “bonus” material for hours of entertainment!

While binging some The Ben Heck Show videos I ran across and old episode titled Speak & Dave Jones in which Ben hacks a Fisher Price See N’Say toy to play a sound for each of Dave Jones’ catchphrases.

The video itself (and especially the idea) is quite fun, but he used a custom PCB for the button matrix and a Propeller(? I think it was) micro, which make the whole project a lot more tedious than it needed to be, not to mention he never posted any of the code/graphics/design files he used.

Since this seemed like an easy enough project to tackle in an afternoon, and I had all the parts (minus the toy itself) lying around, I decided to give it a go while adding some of my own features.