The Piano Metronome is key to keeping the beat

In the world of music, being able to keep time accurately is vital when playing a piece, as even small deviations in timing can cause the notes played to sound “off.” Ordinarily a device called a metronome is used to provide consistent ticks that the musician can use, but most are not that visually interesting. This is what inspired ChristineNZ over on Instructables to create her own metronome that uses an Arduino Uno to both show the beat and produce a small noise. 

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Tencent’s Robotics X Division Shows Off Ollie, a Leaping Wheeled Robot with a Clever “Tail”

Designed around two wheels on four joined “legs,” the secret to Ollie’s agility is a hidden third wheel on an extra limb.

Robotics X, the robotics research division of Chinese multinational conglomerate Tencent, has shown off a new robot dubbed Ollie — capable of performing the skateboarding trick which provided its name, by swinging around a wheeled “tail.”

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Here’s what happened when a Tesla owner built a robot to plug in his car

A Tesla owner built a robot to automatically plug his electric car for overnight charging — something that Tesla has previously announced that it is working on.
Here’s what happened.

The idea of automatically charging electric vehicles have been around for a while.
It seems to have emerged from the idea that electric vehicles are not as convenient to charge as gasoline-powered vehicles are to fuel.
This is not exactly true.

Electric vehicles can be charged overnight at home, which makes them way more convenient than gas-powered cars.
The only aspect that can be seen as less convenient is the charge time versus refueling time when on the go.

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Novel Research Powers Multiple Wearable Devices From a Single Source

This new technology enables a single device to wirelessly power other wearables, using the human body as a medium for power transmission.

Wearable devices have become a large part of how we live our lives — from phones and watches to wireless health monitors and more — and will undoubtedly remain so. A major pain point in using and maintaining a variety of devices, however, is how to keep them properly powered. Charging numerous devices every day can be cumbersome and inconvenient, especially when the battery runs out. A team of researchers at the National University of Singapore have developed a solution: technology that allows a single device to wirelessly power other wearables, using the human body as a medium for power transmission.

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‘Hey Google, piss off the neighbors’ – A mad genius built a ‘TallyWhacker’ that noisily activates via Google Assistant command

Do you recall when you were a kid, and there was nothing quite so fascinating as an old-fashioned spring doorstop? You know, the kind that goes “sproi-oi-oi-oing” with any errant tap? A Reddit apartment dweller, having presumably endured one late-night Riverdance rehearsal too many, decided to weaponize this experience.

He attached said sproinger to an activation arm, mounted it to the ceiling, and powered it with an Arduino microcontroller to give it voice activation powers via Google Assistant. Now with the voice command “hey Google, turn on the TallyWhacker,” the arm bar rolls, the tally is thusly whacked, and the upstairs neighbor presumably begins drafting an email to the landlord. To add a bit more fun to the process, the arm bar will oscillate randomly for between five and thirty seconds.

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The 4-20 MA Current Loop

The I/O capabilities built into most microcontrollers make it easy to measure the analog world. Say you want to build a data logger for temperature. All you need to do is get some kind of sensor that has a linear voltage output that represents the temperature range you need to monitor — zero to five volts representing 0° to 100°C, perhaps. Hook the sensor up to and analog input, whip up a little code, and you’re done. Easy stuff.

Now put a twist on it: you need to mount the sensor far from the microcontroller. The longer your wires, the bigger the voltage drop will be, until eventually your five-volt swing representing a 100° range is more like a one-volt swing. Plus your long sensor leads will act like a nice antenna to pick up all kinds of noise that’ll make digging a usable voltage signal off the line all the harder.

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