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Hackaday



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Last Build Date: Sat, 23 Sep 2017 05:22:24 +0000

 



Cheap, Full-Duplex Software Defined Radio With The LimeSDRLimeSDRheabrianbenchoff

Sat, 23 Sep 2017 05:00:00 +0000

A few years ago, we saw the rise of software-defined radios with the HackRF One and the extraordinarily popular RTL-SDR USB TV tuner dongle. It’s been a few years, and technology is on a never-ending upwards crawl to smaller, cheaper, and more powerful widgets. Now, some of that innovation is making it to the world of software-defined radio. The LimeSDR Mini is out, and it’s the cheapest and most capable software defined radio yet. It’s available through a Crowd Supply campaign, with units shipping around the beginning of next year.

The specs for the LimeSDR mini are quite good, even …read more

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8-Channel ADC For the Raspberry Pimain450lewinday

Sat, 23 Sep 2017 02:00:00 +0000

The Raspberry Pi is a powerful embedded computing platform. However, for all its Linux-based muscle, it lacks one thing that even the simplest 8-bit microcontrollers usually have – analog-to-digital conversion. There are a great many ways to rectify this shortcoming, and [Chris Burgess] has brought us another – with an 8-channel ADC for the Raspberry Pi.

For the ADC, [Chris] chose the MCP3008, for its low cost and availability. In this configuration it offers 10-bit resolution and a maximum sampling rate of 200 kilosamples per second. Adafruit has a great guide on working with the MCP3008, too. With such a …read more

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Solar Tide Clock Keeps Track of the Moonclock_mainnerdyjb

Fri, 22 Sep 2017 23:00:00 +0000

Old fashioned tide clocks were an attempt to predict high tide by timing the rising and setting of the moon. When you looked at one you could see how many hours until the next high tide. [rabbitcreek] wanted to make his own version of the tide clock that does a better job of predicting the actual high tide than those old clocks, which were essentially glorified timers tuned to the moon’s phases.

[rabbitcreek] based his the tide prediction software off of [Luke Miller’s] Tide Clock, which applies location-specific adjustments to the standard lunar clock, taking into consideration such factors as …read more

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Making a Gun Without a 3D Printermainbryancockfield

Fri, 22 Sep 2017 20:00:00 +0000

Around four years ago the world was up in arms over the first gun to be 3D printed. The hype was largely due to the fact that most people don’t understand how easy it is to build a gun without a 3D printer. To that end, you don’t even need access to metal stock, as [FarmCraft101] shows us with this gun made out of melted aluminum cans.

The build starts off by melting over 200 cans down into metal ingots, and then constructing a mold for the gun’s lower. This is the part that is legally regulated (at least in …read more

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Hackaday Prize Entry: HaptiVision Creates a Net of Vibration Motors5824021504468452743nerdyjb

Fri, 22 Sep 2017 18:30:05 +0000

HaptiVision is a haptic feedback system for the blind that builds on a wide array of vibration belts and haptic vests. It’s a smart concept, giving the wearer a warning when an obstruction comes into sensor view.

The earliest research into haptic feedback wearables used ultrasonic sensors, and more recent developments used a Kinect. The project team for HaptiVision chose the Intel RealSense camera because of its svelte form factor. Part of the goal was to make the HaptiVision as discreet as possible, so fitting the whole rig under a shirt was part of the plan.

In addition to a …read more

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Ask Hackaday: Security Questions And Questionable Securitiessecurity-questions-ask-hackaday-featuredlewinday

Fri, 22 Sep 2017 17:01:14 +0000

Your first school. Your mother’s maiden name. Your favorite color. These are the questions we’re so used to answering when we’ve forgotten a password and need to get back into an account. They’re not a password, yet in many cases have just as much power. Despite this, they’re often based on incredibly insecure information.

Sarah Palin’s Yahoo account is perhaps the best example of this. In September 2008, a Google search netted a birthdate, ZIP code, and where the politician met her spouse. This was enough to reset the account’s password and gain full access to the emails inside.

While …read more

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Customizable PCB Business Cardpcb_bizcardnerdyjb

Fri, 22 Sep 2017 15:30:07 +0000

[Corey Harding] designed his business card as a USB-connectable demonstration of his skill. If potential manager inserts the card in a USB drive, open a text editor, then touches the copper pad on the PCB, [Corey]’s contact info pops up in the text box.

In addition to working as a business card, the PCB also works as a Tiny 85 development board, with a prototyping area for adding sensors and other components, and with additional capabilities broken out: you can add an LED, and there’s also room for a 1K resistor, a reset button, or break out the USB’s 5V …read more

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