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Laser for sending music over a distance

Light is a very popular means of communication. Today, optical fiber communication is the backbone of telecommunication and internet. Light is guided through a fiber optic cable in such systems to achieve low-attenuation and high speed data transmission. Question is: Is it possible to use light for communication without a guiding medium? The answer is positive. Because of the highly collimated nature of the ...

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DIY USB 5V Solar Power Bank

Solar energy is renewable, free, widely available and clean form of energy. It is considered as a serious source of energy for many years because of the vast amounts of energy that is made freely available, if harnessed by modern technology. Many people are familiar with so-called photovoltaic cells, or solar panels, found on things like spacecraft, rooftops, and handheld calculators. The cells are made of ...

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LipSync – An Assistive Device For Smartphone Use

Smartphones and mobile devices are diving deeply in our lives and make a lot of things much easier than before. So, having a smartphone or a mobile device became one of life’s necessities for everybody. But unfortunately, there is still a big challenge for people with limited use of their arms to use and benefit from these devices. A group of developers tried to help these people and increase their accessib ...

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Save Your Food with Arduino Freezer Temperature Sensor

“Arduino Freezer Temperature Sensor” is an Arduino based project which works as an indicator to notify you when the freezer isn’t work properly. This project was created by “John Saunders”. To make this project, you will need these parts: Arduino Nano, most of other Arduino boards can be used. USB cable, to connect the Arduino to the computer. Power Adapter, with 5V DC output. Temperature Sensor, TMP36. A p ...

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Rubidium Disciplined Atomic Clock

Description As recently stated on hackaday: "A timepiece is rather a rite of passage in the world of hardware hacking"Presenting: A personal time base. Depending on current location, elevation, and velocity we all experience very real time dilation effects. Time does not pass at the same rate for everyone. The "Project GREAT" experiment in 2005 measured a 20 to 30 ns shift during a weekend family trip to Mt ...

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Optomyography: A novel approach of detecting muscular signals using optical sensors

Optomyography is a novel, non-invasive, non-contact optical method to measure muscular signals of the human body for diagnosing muscular disorders. It is also considered as an emerging technique for making better human-machine interfaces. Matt, Amrit, and Maneesh conducted an optomyogram experiment at Cornell University to sense the movement of fingers and wrist, and eventually to detect hand gestures. The ...

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A full-featured, portable weather data recorder

Do you wonder how to build a personal weather station with data logging capability? Well, Jesus Echavarria, a electronic engineer and DIY hardware maker from Spain, has shared the details of his design of a very professional-looking, full-featured, and portable weather data recorder that is capable of recording ambient temperature, humidity, and light level into a SD card along with a time stamp.The datalog ...

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