Off the shelf EEG hardware records your dreams

Hackaday

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Over the past few years, we’ve seen [Michael]’s adventures in electronics and lucid dreaming. With commercial EEG hardware, [Michael] is able to communicate from inside his dreams with Morse code and record his rhythmic blinking for data analysis when he wakes up. His project is called Lucid Scribe, and now it’s open to just about everyone – including brain experimenters with OpenEEG hardware.

OpenEEG is a project that aims to reduce the cost of EEG hardware by providing the hardware, electrodes, software, and documentation to build your own EEG headset. It’s a great tool in the field of biofeedback, but [Michael] is going one step further; he’s busy writing an algorithm that will detect REM sleep and play an audio track while he’s in a dream state to trigger a lucid dream.

[Michael] points out that anyone with OpenEEG hardware including the DIY Olmex board can contribute to his…

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By rpandroid

[SAMSUNG] SAMSUNG – Galaxy S4 Quad 4G ou Galaxy S4 Octa 3G – Qual deles?

Rodrigo Silva e problemas...

A Samsung disponibilizou no Brasil dois modelos do Galaxy S4, com diferenças na rede de internet, processador e até na GPU, que é a placa gráfica dos smartphones. Nesse artigo vou trazer algumas informações que possam ajudar a saber um pouco sobre esses modelos.

 

Antes de iniciar devo deixar claro que o artigo vem para trazer informações complementares, para que você tenha uma melhor noção na hora de escolher o seu aparelho. O Galaxy S4 ainda não está totalmente presente no mundo e algumas coisas ainda podem mudar.

Primeiramente vamos diferenciar os modelos e saber as principais diferenças entre  cada um.

Samsung Galaxy S4 – 4G – Quad-Core – Modelo I9505

O Galaxy S4, modelo GT-I9505, conta com o processador Quad-Core de 1.9 GHz Krait 300 (Qualcomm APQ8064T Snapdragon 600). O aparelho conta com a GPU Adreno 320 e tem suporte à nossa conexão de Rede 4G (LTE). Esse…

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By rpandroid

Amazon Discounts Kindle Fire HD Tablets for Father’s Day

Tech

Starting today through June 8, Amazon is cutting $20 from its line of Kindle Fire HD tablets when you use the promo code DADSFIRE.

The deal is good for the 7-inch, $199 Kindle Fire HD; the 8.9-inch, $269 Kindle Fire HD; and the 8.9-inch, $399 Kindle Fire HD with 4G LTE connection. The non-HD version of the 7-inch Kindle Fire is also available for $159, but there’s no discount.

Also note that each model listed above includes “special offers” and “sponsored screensavers” that appear on the tablets’ lock screens when they’re idle. You’ll need to pay an extra $15 to get rid of them.

None of the Kindle Fire tablets come with wall chargers, either. Amazon sells a $20 wall plug, but you can plug the included Micro USB cord into a computer to charge the tablet instead.

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By rpandroid

Why PCs Aren’t Dead…Yet

Tech

If you’ve been following the business news lately, you’ve been hearing that demand for PCs is in decline. According to market researcher IDC, in the last quarter, PC shipments were down worldwide by 13.9%. And IDC forecasts that for all of 2013, PC shipments could be down about 7%.

If you read the headlines, you might be led to think that the PC is dead and no longer of value. That is very far from the truth, though. Even with PCs being down 7% this year, we will still see over 340 million PCs and laptops sold around the world. While we will continue to see some erosion in PC demand each year going forward, PCs will continue to play an important role in business, education and even in the home. However, their usage model will be changing, which is inevitable given the fact that the PC is no…

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By rpandroid

Finally, a Camera Without a Lens (and a Sensor the Size of a Pixel)

Tech

Cameras as we know them have long been eye-like: a lens captures light and focuses it on film or a detection sensor, just as the lenses in our eyes focus light on our retinas. What would an eye be like without a lens? Capable of receiving light and to some extent discerning color, but otherwise useless, completely unable to focus that light. So a camera without a lens is kind of deal-breaker, right?

Maybe not. But before we go there, you need to understand something called “compressed sensing” — or at least I did.

Compressed (alternatively, compressive) sensing involves the notion that traditional signal capture techniques gather more information than they need to — far more than necessary to all but perfectly recreate the original signal, anyway. With compressed sensing, then, you gather samples of a signal or image, then use a special construction algorithm to reproduce the original perfectly.

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By rpandroid