Phase Shift Pump Control? There’s An App For That.

The sort of pumps used in the filtration systems of fountains and swimming pools don’t take kindly to running dry. So putting such a pump on a simple timer to run while you’re away comes with a certain level of risk: if the pump runs out of water while you’re gone, you might come home to a melted mess. One possible solution is a float sensor to detect the water level in whatever you’re trying to pump, but that can get complicated when you’re talking about something as large as a pool.

For his entry into the 2019 Hackaday Prize, [Luc Brun] is working on controller that can detect when the pump is running dry by monitoring the phase shift between voltage and current. With an inductive load like a pump, the current should lag behind the AC voltage a bit under normal operation. But if they become too far out of phase with each other, that’s a sign that the pump is running in a no-load condition because there’s no water to slow it down.

As [Luc] explains in the project write-up, simply monitoring the pump’s peak current could work, but it would be less reliable. The problem is that different motors have different current consumptions, so unless you calibrated the controller to the specific load it’s protecting, you could get false readings. But the relationship between current and voltage should remain fairly consistent between different motors.

The controller is powered by a Arduino Nano and uses a ACS712 current sensor to take phase measurements. Since he had the ability to toggle the pump on and off with a relay attached to the Arduino, [Luc] decided to add in a few other features. The addition of a DS1307 Real Time Clock means the pump can be run on a schedule, and an HC-05 Bluetooth module lets him monitor the whole system from his smartphone with an Android application he developed.

Since the theme of this year’s Hackaday Prize is designing a product rather than a one-off build, judges will be looking for exactly the sort of forward thinking that [Luc] has demonstrated here. As the controller is currently a mass of individual modules held inside a waterproof enclosure, the next steps for this project will likely be the finalization of the hardware design and the production of a custom PCB.

An Arduino Sickbay Display Worthy Of The Enterprise

The various displays and interfaces in Star Trek, especially The Original Series, were intentionally designed to be obtuse and overly complex so they would appear futuristic to the audience. If you can figure out how Sulu was able to fly the Enterprise with an array of unlabeled buttons and rocker switches, we’d love to hear it. But one area of the ship where this abstract design aesthetic was backed off a bit was sickbay, as presumably they wanted the audience to be able to understand at a glance whether or not Kirk or Spock were going to pull through their latest brush with death (spoilers: they’re fine).

For his latest project, [XTronical] has recreated the classic displays from Dr McCoy’s sickbay with an Arduino Nano and a 2.8 inch LCD display. It even has a speaker and MP3 player module to recreate the “heartbeat” sound from the original show. The whole thing looks and sounds phenomenal, and would be a perfect desk toy for the classic Trek aficionado. But this isn’t just a toy, it’s a fully functional medical scanner.

Of course, this little gadget can’t tell you if you’ve come down with a nasty case of Rigellian fever, but it can read your vitals using a MAX30100 pulse oximeter module and DS18B20 thermometer. In fact, it actually has two DS18B20 sensors: one to measure ambient temperature, the other to measure skin temperature. With those two figures, [XTronical] says it can calculate your core body temperature. The only thing that’s made up is the blinking “Respiration” indicator, that one’s just an estimate.

So where do we go from here? This project is presented as merely the first step in building a complete prop, perhaps in the form of a medical tricorder. We’ve seen some phenomenal TOS tricorder builds over the years, and some have even used the Raspberry Pi to shoehorn a bit of functionality into them. [XTronical] says he’s working on getting the source code and a step-by-step build guide put together, so keep an eye out for that in the near future.

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Salty? Tip Canister To Rage Quit Games

Do you long for a more pronounced way to rage quit video games? Smashing buttons comes naturally, of course, but this hurts the controller or keyboard. You can quit your longing, because [Insert Controller Here] has an elegant solution that’s worth its salt.

The Salty Rage Quit Controller is simple. The cup is filled with distilled water. When you pour salt in it, the two bolt terminals tell the Arduino Micro that the resistance in the water has decreased. The Micro sends whatever keystrokes you want, so you could call out your deadbeat medic before quitting, or just plain leave. [Insert Controller Here] has example code on his site to get you started. Click calmly past the break to watch the demo and build videos, or we’ll have to ban you for aggro.

With the right tools, you can turn anything into a game controller. Check out this car controller that uses Python and CAN bus sniffing.

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The Arduboy Gets A Crank Mod

You’ve seen VR headsets and wearable video game controllers and flight yokes and every other type and kind of video game controller, but a crank? Yes, the Arduboy now has a crank modification in tribute to (or blatant ripoff of) the PlayDate, a video game console created by Panic and Teenage Engineering.

The basis for this build is the Arduboy, a miniature game system the size of a credit card. This game console features candy-like buttons, compatibility with the Arduino IDE, and a community that has produced dozens of games already. Where there’s software developers there’s inevitably a few hardware engineers waiting in the wings, and this is no exception. [bateske] created a crank mod for the Arduboy that gives this miniature, toy-like game console a crank. Ready to write a bass fishing simulator? This is your shot.

The hardware for this build consists of a 360° rotary encoder for the internals of the device. For the handle, [bateske] found an interesting ‘premium grinder for herbs and spices’ on Amazon. Shockingly, this crank handle just sort of works with the rotary encoder.

As for games, this is a brand new user interface for the Arduboy game console, so of course there are some interesting possibilities. There’s a fishing simulator that’s more interesting than real fishing and something like Flappy Bird only instead of flapping it’s bouncing over bottomless pits. You can check out this crank console out below.

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School’s In Session With Arduboy Curriculum

It’s hard not to be impressed by the Arduboy. In just a few short years, [Kevin Bates] went from proof of concept to a successful commercial product without compromising on his original open source goals. Today, anyone can develop a game for the Arduboy and have it distributed to owners all over the world for free. If you’ve ever dreamt of being a game developer, the Arduboy community is for you.

Realizing the low-cost hardware and open source software of the Arduboy makes it an excellent way to learn programming, [Kevin] is now trying to turn his creation into a legitimate teaching tool. He’s kicking off this new chapter in the Arduboy’s life with a generous offer: giving out free hardware to educators all over the world. Anyone who wants to be considered for the program just needs to write-up a few paragraphs on how they’d utilize the handheld game system in their class.

[Kevin] already knows the Arduboy has been used to teach programming, but those have all been one-off endeavours. They relied on a teacher that was passionate enough about the Arduboy to put in their own time and effort to create a lesson plan around it. So one of the main goals right now is getting an official curriculum put together so educators won’t have to start from scratch. The community has already developed 16 free lessons, but they’re looking for help in creating more and translating them into other languages.

While the details are still up in the air, [Kevin] also plans to travel to schools personally and help them get their Arduboy classes off the ground. He’s especially interested in developing countries and other areas that are disadvantaged educationally. Believing that the Arduboy is as much a way to teach effective leadership and teambuilding as it is programming, he thinks this program can truly make a difference.

Since [Kevin] first Rickrolled us with his prototype in 2014, we’ve seen the Arduboy project spread like wildfire through the hacker community. From figuring out how to play its games on other gadgets to developing an expansion cartridge for the real thing, the Arduboy has already done its fair share of inspiring. Here’s hoping it has just as much of an impact on the next generation of hackers once they get their hands on it.

Blisteringly Fast Machine Learning On An Arduino Uno

Even though machine learning AKA ‘deep learning’ / ‘artificial intelligence’ has been around for several decades now, it’s only recently that computing power has become fast enough to do anything useful with the science.

However, to fully understand how a neural network (NN) works, [Dimitris Tassopoulos] has stripped the concept down to pretty much the simplest example possible – a 3 input, 1 output network – and run inference on a number of MCUs, including the humble Arduino Uno. Miraculously, the Uno processed the network in an impressively fast prediction time of 114.4 μsec!

Whilst we did not test the code on an MCU, we just happened to have Jupyter Notebook installed so ran the same code on a Raspberry Pi directly from [Dimitris’s] bitbucket repo.

He explains in the project pages that now that the hype about AI has died down a bit that it’s the right time for engineers to get into the nitty-gritty of the theory and start using some of the ‘tools’ such as Keras, which have now matured into something fairly useful.

In part 2 of the project, we get to see the guts of a more complicated NN with 3-inputs, a hidden layer with 32 nodes and 1-output, which runs on an Uno at a much slower speed of 5600 μsec.

This exploration of ML in the embedded world is NOT ‘high level’ research stuff that tends to be inaccessible and hard to understand. We have covered Machine Learning On Tiny Platforms Like Raspberry Pi And Arduino before, but not with such an easy and thoroughly practical example.

Scripting Language Rapidly Develops A Clock

In the past, you might very well have started programming in Basic. It wasn’t very powerful language and it was difficult to build big projects with, but it was simple to learn, easy to use, and the interpreter made it easy to try things out without a big investment of time. Today you are more likely to get started using something like an Arduino, but it is easy to miss the accessible language and immediate feedback when you are doing simple projects. Annex WiFi RDS (Rapid Development Suite) is a scripting language for the ESP8266 that isn’t quite Basic, but it shares a lot of the same attributes. One example project from [cicciocb] is a scrolling dot matrix LED clock.

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