Dog-POV: Canine Speed Indicator

October 7, 2017 by John Baichtal 16 Comments

[Johan Beyers] built an elegantly simple Dog Speedometer project that uses a POV display to display a running dog’s speed without the benefit of an accelerometer. Using an Arduino (looks like it might be a D-love) and a line of 5 LEDs, [Johan] built a dirt-simple POV — 39 lines of code — that times out the flashes so that an immobile viewer sees the dog’s speed. How do you know your pup’s loping speed? That’s the beauty of this project.

Instead of putting all of the LEDs in a line, they are arranged in a V-shape. Because of this spatial offset, the patterns flashed out only “look right” at the right speed. Each number is flashed at a different speed, so you just look for the least distorted numeral.

[Johan]’s code does only what it needs to get the job done. The character data are stored in arrays that are played back directly to the pins of PORTD — avoiding most of the usual Arduino-style complexity with pin definitions and other foolery.

POV displays can be leveraged to add pizzazz to any project — this CD-ROM POV clock and this wind-powered POV weather station come to mind.

Arduino Uno Strain Relief

October 7, 2017 by Will Sweatman 24 Comments

Do jumper wires pulling out of your Uno have you pulling your hair out? Is troubleshooting loose jumpers making you lose your mind? Are your projects backing up because of all the time you’ve lost keeping jumper wires secure in your Arduino Uno? Then you need the all new Ardunio Strain Relief Enclosure!

[Jeremy Cook] has had it with loose jumpers pulling out of his Uno, so he designed a case that not only secures the Arduino; it also keeps those dastardly jumper wires from pulling out at the most inconvenient times.

Composed of 3/4 inch thick MDF and 1/8 inch thick polycarbonate, the Arduino Strain Relief enclosure is sure to be a hit for every hacker’s work bench. [Jeremy] used a CNC router to cut the enclosure and top. The plastic top is secured to the MDF base via four 4-40 screws. Interestingly – he applied super glue to the screw holes in the MDF before tapping them. We’ll have to try this trick on our next project!

“The Cow Jumped Over The Moon”

October 6, 2017 by Anool Mahidharia 12 Comments

[Ash] built Moo-Bot, a robot cow scarecrow to enter the competition at a local scarecrow festival. We’re not sure if Moo-bot will win the competition, but it sure is a winning hack for us. [Ash]’s blog is peppered with delightful prose and tons of pictures, making this an easy to build project for anyone with access to basic carpentry and electronics tools. One of the festival’s theme was “Out of this World” for space and sci-fi scarecrows. When [Ash] heard his 3-year old son sing “hey diddle diddle, the cat and the fiddle…”, he immediately thought of building a cow jumping over the moon scarecrow. And since he had not seen any interactive scarecrows at earlier festivals, he decided to give his jumping cow a lively character.

Construction of the Moo-Bot is broken up in to three parts. The skeleton is built from lumber slabs and planks. The insides are then gutted with all of the electronics. Finally, the whole cow is skinned using sheet metal and finished off with greebles to add detailing such as ears, legs, spots and nostrils. And since it is installed in the open, its skin also doubles up to help Moo-bot stay dry on the insides when it rains. To make Moo-Bot easy to transport from barn to launchpad, it’s broken up in to three modules — the body, the head and the mounting post with the moon.

Moo-Bot has an Arduino brain which wakes up when the push button on its mouth is pressed. Its two OLED screen eyes open up, and the MP3 player sends bovine sounding audio clips to a large sound box. The Arduino also triggers some lights around the Moon. Juice for running the whole show comes from a bank of eight, large type “D” cells wired to provide 6 V — enough to keep Moo-Bot fed for at least a couple of months.

Check out the video after the break to hear Moo-bot tell some cow jokes – it’s pretty funny. We’re rooting for it to win the competition — Go Moo-bot.

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Dumbo Never Forgets To Fill Your Glass

October 5, 2017 by Al Williams 27 Comments

What do you get if you have a 3D printer, some booze (or any beverage), a pump, and an Arduino? If you are [RobotGeek] you wind up with an elephant that will pour you a shot on demand. The project was inspired by the ShotBot, but we have to admit the elephant sells it.

Conceptually, the device is pretty simple. A pump and a light sensor do all the real work. When you cover the sensor with a shot glass, the pump dispenses liquid. What we found of interest, though, was the process of starting with an elephant model and then modifying it for the purpose at hand. In addition to making it larger, they also cut off the trunk and replaced it with a spout. The steps show Fusion 360, but you could apply the same concepts using your choice of CAD programs.

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Who Owns Arduino?

October 5, 2017 by Elliot Williams 67 Comments

Who owns Arduino? We don’t mean metaphorically — we’d say that’s the community of users and developers who’ve all contributed to this amazing hardware/software ecosystem. We mean literally. Whose chips are on the table? Whose money talks? It looks like ARM could have a stake!

The Arduino vs Arduino saga “ended” just under a year ago with an out-of-court settlement that created a private holding company part-owned by both parties in the prior dispute over the trademark. And then, [Banzi] and the original founders bought out [Musto]’s shares and took over. That much is known fact.

The murky thing about privately held companies and out-of-court settlements is that all of the details remain private, so we can only guess from outside. We can speculate, however, that buying out half of the Arduino AG wasn’t cheap, and that even pooling all of their resources together, the original founders just didn’t have the scratch to buy [Musto] out. Or as the Arduino website puts it, “In order to make [t]his a reality, we needed a partner that would provide us with the resources to regain full ownership of Arduino as a company… and Arm graciously agreed to support us to complete the operation.” That, and the rest of the Arduino blog post, sure looks like ARM provided some funds to buy back Arduino.

We reached out to [Massimo Banzi] for clarification and he replied:

“Hi arm did not buy nor invest in arduino. The founders + Fabio Violante still own the company. As I wrote in the blog post we are still independent, open source and cross platform.”

We frankly can’t make sense of these conflicting statements, at least regarding whether ARM did or didn’t contribute monetary resources to the deal. ARM has no press release on the deal as we write this. Continue reading “Who Owns Arduino?” →

An Arduino Weather Station With An E-Ink Display

September 27, 2017 by Jenny List 18 Comments

For our Northern Hemisphere readers the chill winds of winter are fast approaching, so it seems appropriate to feature a weather station project. Enjoy your summer, Southern readers!

[Fandonov] has created a weather station project with an Arduino Uno at its heart and a Waveshare e-ink display as its face to the world, and as its write-up (PDF) describes, it provides an insight into both some of the quirks of these displays, and into weather forecasting algorithms.

The hardware follows a straightforward formula, aside from Arduino and display it boasts an Adafruit sensor board and a hardware clock. Software-wise though there are some tricks to give the display a scalable font that other tinkerers might find useful, drawing characters as a matrix of filled circle primitives.

The write-up gives an introduction to forecasting based only on local readings rather than on the huge volumes of data over a wide area used by professional meteorologists. In play here is the Zambretti algorithm, which takes the readings and information about whether they are rising or falling, and returns a forecast from a look-up table.

As we’ll all be aware, even professional weather forecasting is fraught with inaccuracies, but this is nonetheless an interesting project that is very much worth a second look. Meanwhile we’ve covered huge numbers of weather stations in the past, a couple of interesting ones are this one using a classic TI99/4A home computer, and more relevant here, this one using an e-paper badge.

Thanks [Phil] for the tip!

Chess Robot’s Got The Moves

September 26, 2017 by John Baichtal 14 Comments

[RoboAvatar]’s Chess Robot consists of a gantry-mounted arm that picks up chess pieces and places them in their new location, as directed by the software. The game begins when the human, playing white, makes a move. When a play has been made, the human player presses a button to let the robot to take its turn. You can see it in action in the videos we’ve posted below the break.

Running the robot is an Arduino UNO with a MUX shield as well as a pair of MCP23017 I/O expander chips — a total of 93 pins available! Thanks to all those pins, the Arduino is able to listen to 64 reed switches, one for every square.

The robot detects the human’s move by listening to its reed switches and identifying when there is a change. The gantry consists of X and Y tracks made out of PVC slabs, with half-inch lead screws turned by NEMA-23s and powered by ST-6600 stepper drivers.

Unlike some chess robots that rely on pre-existing software, this one features a custom minimax chess algorithm that [RoboAvatar] coded himself. It consists of Python scripts run on a computer, which interacts with the Arduino via a serial connection. In the second video, he explains how his algorithm works. You can also download the Arduino and Python files from [RoboAvatar]’s GitHub repository.

You’d be surprised how many chess-playing robots we’ve published, like the ChessM8 robot and this voice-controlled chess robot.

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