If you've ever bent the pin on a microcontroller while trying to insert it into a DIP programming socket, you're not alone. Aligning those crazy pins again and again, while intermittently prying them out of the programming socket and then inserting your freshly burned chip into a target circuit, can lead to a long and sleepless night. Luckily, there is a cure for the bent pin nightmare. And this prescription costs less than $35.
Another neat way to avoid having to pull the chip off of a board to program it is to build a clip-on programmer, using a chip-clip (the kind meant to clip onto the sides of IC chip pins, not the kind meant for keeping your potato chips from getting stale). This is especially useful if you might want to reprogram a microcontroller after permanently soldering it to a board, since you don't have to design in a programming header. Depending on how you wire it up you can use it with a serial bootloader or an ISP-programmer. I've made clip-on programming adapters for DIP and SOIC package AVRs, and I would post pictures/links, but I'm afraid that would get this post held indefinitely for review (still waiting for my flashlight project post to be 'reviewed'). Instead, you could hop over to Digikey and search for the "Test Clips - IC" category. -Adam
There’s an inherent dilemma in purchasing a flashlight: The really bright and long-lasting LED models are pretty expensive, and the heavy, cheap traditional ones always seem to be dead just when you need them the most. Good thing it’s possible to build your own superbright, reliable and inexpensive hybrid light.
AARGH! After two attempts! Posts with even plain-text url's in them are being held for review as possible spam! So, to find the G. Y. Xu article you can google search for "February 2008 nuts and volts charge pump" and follow the first two links to the two pages of the article. -Adam P.S. Flagging posts with links for review is a good idea, but I think it makes more sense to let them show up while they're waiting to be reviewed, then delete them later if the do turn out to be spam!
Ah, that sinking feeling: You’ve just left for a business trip when you realize you’ve forgotten the PowerPoint presentation on your PC at home. No matter: With the right tools in hand, you’ll be able to retrieve your file regardless of where you are.
Great primer! Windows XP remote desktop has saved my hide more than once. It's only built into professional edition, but you can download remote control clients for other versions of the Windows OS, or even for Mac OSX. If your motherboard supports it and you can configure your router to broadcast the wakeup packets you can use Wake On Lan to turn your computer on from anywhere too, so you don't have to leave it on all the time. Although it isn't shown as a normal start-menu option, you can also turn off your computer remotely by going to the task manager (start->run->taskmgr) and choosing "Turn Off" from the "Shut Down" options menu. Be careful about pulling up the task manager with ctrl+alt+delete though, I've turned off the local computer I was using more than once that way! -Adam
If you're looking for an easy way to add DC motor control to your next Arduino project, look no further than the Orangutan LV-168 Robot Controller by Pololu. Equipped with two bidirectional, low-voltage, H-bridge motor controls, this ATmega168 board can handle many of the tasks that are typically sought by Arduino DIYers. Plus you won't have to monkey around with lots of complex programming, either.
This looks really fantastic, I want a fleet of mini Hummer-bots patrolling my house! Any chance of posting a video of the Hummer-bot in action? If you wanted to save a tad by combining shipping and/or let your robot spot objects farther away, Pololu carries the similar Sharp GP2Y0A21YK0F distance sensor, which has a range of 10cm to 80cm (as opposed to the 4cm to 30cm range of the Sharp GP2D120). You would probably need to tweak the sketch constants a little to adjust for the different range though. -Adam
When you're vacationing on a beach, nothing beats an underwater camera; but watertight cases are pricey and disposables have lousy quality. Lucky for you, the editors of PopSci have come up with an easy workaround using something there's probably already plenty of in your suitcase (hint: not socks). That's right, thanks to the magic of unlubricated condoms, you too can transform your point-and-shoot into an waterproof wonder. The set-up is easy enough, but as John and Doug demonstrate, it really does help to have a partner lend a hand.
Here's a similar project, just a little more in depth: http://www.diyphotography.net/diy_the_cheap_yet_shamefull_underwater_housing They address the condom clarity problem and have some videos taken underwater with the camera. The soft glue they use probably works better than hard crazy-glue, but it's just an extra level of protection. Wow, it's hard not to make puns about this project! -Adam
In the world of cinematic science fiction one of the most appealing themes involves a universe brimming over with intelligent life. In this imagined future (or past) humans interact with alien friend and foe because they've at last hammered down the ability to travel to distant stars and galaxies, and, yes, "to boldly go where no man has gone before. Having grown up on the original Star Trek series, observed the effect of the Star Wars movies on the zeitgeist of movie-going generations and enjoyed sci-fi soap operas like Battlestar Galactica, I have to admit I wish we could make it happen; no matter the odds.
Thanks for taking the time to point out that some Sci-Fi science isn't entirely and blatantly impossible. As to Star Trek's "impossible physics justified by indecipherable techno-jargon," well sure, once you have Heisenberg compensators you can do anything! -Adam
Remember Surface, the magic coffee table and massively multi-touch screen that we awarded a Best of Whats New award in December? Well it looks like its finally set to debut, as a shopping kiosk debuting at six AT&T cellular phone stores on April 17.
You can lay your own multi-point interface over a monitor or media projector screen using a Nintendo Wiimote, some infrared LEDs, a bluetooth enabled PC, and some free software from a very smart PHD student at CMU named Johnny Chung Lee. It's not quite as nice, but it is possibly cooler, and costs orders of magnitude less. Go to: http://www.cs.cmu.edu/~johnny/projects/wii/ and scroll down to: "Low-Cost Multi-point Interactive Whiteboards Using the Wiimote" I had a little trouble with the software until I installed the latest version of DirectX, then it worked like a charm! -Adam P.S. Check out Johnny's other neat projects too!
Remember the flurry of discussion generated by our original article about prodding a bashful credit card into making a good swipe? Well, those creative minds at SparkFun Electronics (SFE) have now entered the fray.
By "Post your results" I'm sure our friends at PopSci mean 'describe in general your results' rather than 'copy-paste the unencrypted data from the mag stripe of your credit card into a post'. SparkFun also sells a mag card reader/writer after all... -Adam
If your DIY tinkering tends to lean toward the programming side, there's a good chance you're familiar with AVR microcontrollers. There's also a good chance that you may have been confused when, right out of nowhere, Atmel (the company who designed the AVR family) changed the AVR in-system programming (ISP) interface from 10 pins to 6 pins. Even worse, Atmels terrific USB ISP programmer, the AVRISP mkII uses only the modern 6-pin interface. No legacy support for your older AVR-related hardware here, folks. So whats a poor budding AVR programmer to do?
Rather than soldering directly to the AVRISP board, you could make an adapter cable and keep your warranty intact. Or for a super-clean solution, SparkFun also carries an “AVR Programming Adapter” board for just under a dollar. They advertise it for connecting older 10-pin programmers to newer 6-pin ISP devices, but it works both ways: http://www.sparkfun.com/commerce/product_info.php?products_id=8508 (header pins/sockets are also available, but not included) I recently encountered an unusual AVRISP problem, but with a quick easy fix. The mkI programmer has polarized 6 pin and 10 pin sockets, but the AVRISP mkII just has six bare header pins. A forum-friend recently received one with the header cable plugged in backwards internally (new, out of the box, straight from Digikey!), and it took forever to figure the problem out. I’m sure this is rare, but watch out! -Adam P.S. How’s the 136 year archive coming along?
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