Category Archives: ultrasonic

Graphene from Graphite by Electrochemical Exfoliation

Graphene is an interesting material, but making enough of the stuff to do something useful can be a little tough. That’s why we’re always on the lookout for new methods, like this electrochemical process for producing graphene in bulk.

You probably know that graphene is a molecular monolayer of carbon atoms linked in hexagonal arrays. Getting to that monolayer is a difficult proposition, but useful bits of graphene can be created by various mechanical and chemical treatments of common graphite. [The Thought Emporium]’s approach to harvesting graphene from graphite is a two-step process starting with electrochemical exfoliation. Strips of thin …read more

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Posted in chemistry hacks, delamination, electrochemistry, exfoliation, ferrous sulfate, graphene, graphite, ultrasonic | Leave a comment

Hackaday Prize Entry : DEER — An Electronic Repellent

Ultrasonic repellent devices used to keep away insects, rodents, birds, and even large animals have been around for quite a while, but their effectiveness depends on who you ask.  Some critters just don’t seem affected, while some others definitely will avoid being around such a device. Deploying a few of these devices to scare off animals seems to be working quite well for [Ondřej Petrlík]. Around where he lives, the fields of tall grass need to be mowed down during the spring. Unfortunately, the tall grass is ideal for young, newborn animals to stay hidden and safe. The mowing machines …read more

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Posted in 2017 Hackaday Prize, Animal repeller, Animal Safety, deer, repellent, Repeller, The Hackaday Prize, ultrasonic, ultrasonic transducer, ultrasound, wildlife, wildlife safety | Leave a comment

Reverse Engineering An Ultrasonic Car Parking Sensor

It has become a common sight, a must-have feature on modern cars, a row of ultrasonic sensors embedded in the rear bumper. They are part of a parking sensor, an aid to drivers for whom depth perception is something of a lottery.

[Haris Andrianakis] replaced the sensor system on hs car, and was intrigued enough by the one he removed to reverse engineer it and probe its workings. He found a surprisingly straightforward set of components, an Atmel processor with a selection of CMOS logic chips and an op-amp. The piezoelectric sensors double as both speaker and microphone, with a …read more

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Posted in car hacks, teardown, ultrasonic, ultrasonic radar, ultrasound | Leave a comment

A Cool Mist that Dries Your Clothes

This one is both wild enough to be confused as a conspiracy theory and common sense enough to be the big solution staring us in the face which nobody realized. Until now. Oak Ridge National Laboratory and General Electric (GE), working on a grant from the US Department of Energy (DOE), have been playing around with new clothes dryer technology since 2014 and have come with something new and exciting. Clothes dryers that use ultrasonic traducers to remove moisture from garments instead of using heat.

If you’ve ever seen a cool mist humidifier you’ll know how this works. A piezo …read more

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Posted in clothes dryer, cool mist, Department of Energy, dryer, ge, green hacks, home hacks, piezo, ultrasonic, ultrasonic transducer | Leave a comment

Drinkable Clouds Get You Second-Hand Drunk

While the rise of electronic cigarettes and vaping has led to many aggravated bystanders, an installation in Germany may have found a vapor of a different ilk. Rather than nicotine, this cloud of vapors is full of tequila which precipitates out into glasses (or people) who happen to be nearby.

The cloud generator uses ultrasonic devices to vibrate the tequila molecules until they form a fine mist. The mist is delivered outward towards the sculpture, where a delicious cloud forms. From there, the cloud literally rains tequila out into its original, drinkable tequila form. It appears to take a while …read more

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Posted in cloud, misc hacks, precipitation, tequila, ultrasonic, vacation, vapor | Leave a comment