Tag Archives: Nano

Supplino is a variable benchtop power supply that you can build yourself

via Arduino Blog

Working with electronics requires access to stable power in a variety of voltages. Some components require 3.3V and others require 5V. Still others need 9V or 12V — there are many possibilities. You could keep a variety of wall warts on hand, but a variable benchtop power supply is a more convenient option. Supplino is one choice and this guide from Giovanni Bernardo and Paolo Loberto will walk you through how to build one.

Supplino can accept anything from 4 to 40 volts and can output anything from 1.25 to 36 volts, with a maximum of 5A. An XH-M401 module with an XL4016E1 DC-DC buck converter handles the voltage regulation. Technically, you could use that alone to power your components. But the addition of an Arduino Nano board (or Nano Every) makes the experience far friendlier. It monitors the power supply output and drives a 1.8″ 128×160 TFT LCD screen, which displays the present voltage, amperage, and wattage.

The Arduino receives power from a second 5V buck converter. It uses a relay to control power going to the primary buck converter. A relocated potentiometer controls the voltage. Two banana plug socket make it easy to attach alligator clips or whatever other leads your project requires. You can wrap up all of these components in a tidy and attractive 3D-printed enclosure, which is compact and fits on any desktop. You have many options for the input power, but a laptop power supply is a good choice.

More details on the Supplino can be found in its post here.

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Plot designs onto cups with CylinDraw

via Arduino Blog

Most plotters are planar, meaning they move in a single plane — though they often have the ability to move the tool up and down in the third axis. But if you convert one axis of the drawing plane into rotation, you get cylindrical plotting. That is how the rotary axis on a CNC machine works. If the tool moves in a third axis, you can even do conical plots. That’s exactly how CylinDraw makes it possible to plot directly onto cups and glasses.

CylinDraw is an open source “cup-specific” plotter and engraver. It is a 2.5 axis machine with a rotary axis, similar to the famous EggBot egg plotter. Except instead of drawing onto the elliptical (in cross section) surface of an egg, CylinDraw plots onto the straight or sloped surface of cups, bottles, and similar objects. By equipping a Dremel or other rotary tool, you can also engrave onto a surface instead of drawing. If you do draw, the software also lets you swap pens to get a full color palette.

An Arduino Nano board controls CylinDraw’s operation, including the stepper motors that rotate the cup and move the tool along the X axis. The frame and many of the parts, including the lathe-inspired chuck, are 3D-printed. But it is the software that really differentiates CylinDraw from similar plotters. With this software, you can automatically convert images into G-code toolpaths for the Arduino to follow for plotting.

CylinDraw is currently available as a DIY hardware kit on Etsy if you want to build one for yourself.

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This freeform sculpture doubles as a drink temperature monitor

via Arduino Blog

While some prefer iced coffee, few like a cup of Joe that’s been sitting out for too long and has simply stabilized to room temperature. To ensure his beverage is up to snuff, YouTuber Make Fun Stuff has created his own non-contact temperature display for his desk.

The device features a brass rod circuit sculpture that holds an IR sensor over the drink, transferring signals to an Arduino Nano in the assembly’s base. The Nano is turned on via a small switch, which is activated by the weight of the mug when in place. Five LEDs are used to indicate how hot the coffee is, embedded inside almost-drilled-through holes in the wood. This allows the lights to shine visibly when active and disappear when off, preserving an understated look for the unit.

More details on the project’s construction can be found in Make Fun Stuff’s video below.

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No opponent nearby? Not a problem! This automatic chessboard lets you play others remotely

via Arduino Blog

Chess is an excellent game to play with friends, but what if you don’t have any to compete against nearby? This is what prompted maker Carlos Pendas to create an automatic chessboard that’s not only able to record which pieces got moved, but even move the pieces itself. This means you can play a game of physical chess with someone thousands of miles away. 

To begin, Pendas started out by designing and milling his own chess pieces with a special cutout underneath to hold both a weight and a magnet. The magnet is vital here as it’s what gets detected by the array of 500 Hall effect sensors underneath the board and moved by the articulating arm. After a player makes their move, an Arduino Nano reads which Hall sensors were activated and in what order to determine the piece moved. This data is then relayed to a Nano 33 IoT that communicates with a Lichess server to send movement and general game commands. 

Once the remote player makes their move, a command is sent to an ESP32 that controls a robotic arm with an electromagnet placed on the end. It precisely maneuvers each piece to avoid collisions and keep the board looking tidy. 

Chess GIF - Find & Share on GIPHY

You can read more about how the automatic chessboard was built on Pendas’ Hackaday.io project page.

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Create your own low-cost contactless IR thermometer with Arduino

via Arduino Blog

In the age of COVID-19, being able to know when someone’s sick is vital, especially in countries where the disease is currently surging. It’s for this reason that Open Green Energy decided to build a battery-powered portable thermometer that not only takes a person’s temperature but also alerts other if it’s too high.

At the heart of the device is an Arduino Nano that takes in temperature data from a GY-906 module and displays it on a 0.96” OLED screen. Additionally, there’s an IR emitter/receiver that detects when a person is in front of the thermometer so their temperature can be read. If the value falls within the acceptable range, a green LED lights up, but if the value is too high, such as in the case of a fever, a buzzer begins to sound, and the red LED turns on. 

All of the electronics were assembled onto a custom-designed PCB that has headers for the various modules and LEDs, along with a place for the Arduino and battery charging circuit. All of these components were then positioned inside of a 3D-printed enclosure that holds both the batteries and PCB at the bottom and the screen/LEDs at the top. 

For more information about this project you can view its well-written writeup here on Instructables. 

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This 3D-printed tourbillon was modeled after Jacob & Co’s Twin Turbo Furious watch

via Arduino Blog

It seems like everyone who has a substantial net worth carries around a few luxury watches, but none are perhaps as mechanically enthralling as the Twin Turbo Furious watch from Jacob & Co., which houses a pair of spinning orbs called tourbillons that increase the watch’s accuracy. However, they’re quite small and intricate, so seeing exactly how they work is difficult. This is why mcmaven on Instructables wanted to create a huge 3D-printed version that shows every detailed component. 

At the heart is the balance wheel and spring which tick along and keep the time. Further up, the escape wheel works in a ratchet mechanism to slowly load and release the spring as the tourbillon spins. These core components are then placed into the two halves of the body that spins around on the base. 

To produce movement, a single 28BYJ-48 stepper motor turns a gear underneath the base to spin the tourbillon. One nice feature of this project is the assembly’s ability to keep a consistent speed through the use of a rotary encoder, as the previous speed is stored within EEPROM and loaded upon boot. A single Arduino Nano is responsible for controlling the entire system, and as seen in the video, it looks incredible.

More details on the tourbillon can be found in its write-up.

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