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posted Feb 5th 2012 3:45pm by
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600福利合集at hack a day, we don’t throw the term genius around lightly. we’re obligated to bestow that title on [don gilmore] for his amazingly simple .â to appreciate [don]‘s build, you need to realize that just because a piano has 88 keys, that doesn’t mean it has 88 strings. treble notes have three strings per key while tenor and bass notes have one or two strings each. this usually comes out to more than 200 strings per piano, and [don] can bring them all up to tune in under a minute.

600福利合集[don]‘s system needs to perform two functions. the first one is sustaining the strings so the computer can ‘hear’ the strings. he does this with a magneticâ sustainer that isâ a lot like an . to bring the strings up to the right pitch, there are small heaters underneath the pin block. running a little bit of current through these heaters allows [don] to decrease the tension of each string and lower the pitch.

this tech reminds us of the , a self-tuning guitar that does it’s trick with motors in the tuners. the gibson didn’t do well on the sales floor, given that everybody and their mom can tune a guitar. pianos, though, are another story. [don] is looking for investors to bring his idea to market, and we hope to see it on the floor of a music shop sometime in the future.

yes, an reo speedwagon reference. only slightly ashamed, if you’re wondering.

posted Sep 7th 2005 9:30am by
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battery tab welder

600福利合集[phil pemberton] has been building quite a few battery packs over the last year and decided he needed a better method than soldering. soldering can often damage the end caps and cell seals. he decided to build a simple capacitance-discharge resistance welder to assemble the packs more efficiently. it doesn’t take many parts, but you’ll have to do some tuning to get it to work correctly.

posted Aug 4th 2007 3:23pm by
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[Aaron] gave the latest on WiCrawl. The focus has been on the UI and usefulness for penetration testing. It’s got support for [David]s cracking accelerator and some UI improvements. Even better, you can grab the WiCrawl module to put on aSlax livecd from the . [Aaron] passed out some CD’s at the talk – I’ll update if the ISO gets posted.

and yes, i think i finally recovered from playing hacker jeopardy on team mrl. we held our own, but lost on the (lame) final jeopardy question.

posted Aug 4th 2011 9:50am by
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600福利合集instructables user [dustinandrews] just took the wraps off his latest creation, .

600福利合集actually, to call it an clone is technically incorrect – while he aimed to produce a tiny arduino-compatible board, his goal was not to replicate the mini’s design. instead, he developed a 1” x 1” board from scratch, covering the construction process in great detail.

when you are working with components this tiny, the only reasonable way to get things done is via solder reflow. he walks through the steps he took to produce the board, which should be enough to guide those doing reflow for the first time through the process without too much trouble.

600福利合集the end result looks pretty nice, and when he puts it up side by side against the arduino pro mini, his board can definitely hold its own. while his design lacks an on-board power regulator and reset button, he does provide two more analog i/o pins than the mini, along with several other enhancements.

posted Oct 13th 2011 9:01am by
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600福利合集the weekend is almost here and if you’re looking for an afternoon project consider . [emihackr97] built the one you see above using parts on hand, but even if you put in an order for everything, it won’t cost you much.

600福利合集he used a cardboard box as the housing for the clock, marking a grid for the leds on the face and drilling holes to house them. two columns for hours and another two for minutes let the clock display 24-hour time with alternate firmware for 12 hour time. since there are two buttons – one to set hours, the other to set minutes – a little coding would make it possible to select between the two either by clicking both buttons at once, or holding down one button.

600福利合集[emihackr97] is driving the display with an atmega48, which is a pin-compatible replacement for the atmega168/328. those chips are the type most commonly found on arduino boards an indeed this project is running the arduino bootloader, but uses an isp programmer and breadboarded circuit to keep the costs low. there are plenty of pins to drive the 13 leds directly, making the soldering quick and painless. check out a demo clip after the break.

600福利合集if you’re successful at this build and get the itch for something with more style, there’s a ton of ways to .

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