Sorting Resistors With 3D Printing And A PIC

December 30, 2016 by 20 Comments

If you aren’t old enough to remember programming FORTRAN on punched cards, you might be surprised that while a standard card had 80 characters, FORTRAN programs only used 72 characters per card. The reason for this was simple: keypunches could automatically put a sequence number in the last 8 characters. Why do you care? If you drop your box of cards walking across the quad, you can use a machine to sort on those last 8 characters and put the deck back in the right order.

These days, that’s not a real problem. However, we have spilled one of those little parts boxes — you know the ones with the little trays. We aren’t likely to separate out the resistors again. Instead, we’ll just treasure hunt for the value we want when we need one.

[Brian Gross], [Nathan Lambert], and [Alex Parkhurst] are a bit more industrious. For their final project in [Bruce Land’s] class at Cornell, they built a 3D-printed resistor sorting machine. A PIC processor feeds a resistor from a hopper, measures it, and places it in the correct bin, based on its value. Who doesn’t want that? You can see a video demonstration, below.

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Mike Szczys On The State Of The Hackaday

December 30, 2016 by 70 Comments

Hey, that’s me! I had the honor of giving a talk at the Hackaday SuperConference in November about our editorial direction over the past year and looking towards the next. At any given time we have about 20-25 people writing articles for Hackaday. We depend on their judgment, experience, and skill to keep Hackaday fresh. It would be wonderful if you would join me in thanking all of the writers and editors for a great year by leaving your well-wishes in the comments.

Take a look at the video of the talk, then join me below for a few more thoughts.

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Reflow Soldering At Another Level

December 30, 2016 by 17 Comments

We’re used to reflow soldering of our PCBs at the hacker level, for quite a few years people have been reflowing with toaster ovens, skillets, and similar pieces of domestic equipment and equipping them with temperature controllers and timers. We take one or two boards, screen print a layer of solder paste on the pads by using a stencil, and place our surface-mount components with a pair of tweezers before putting them in the oven. It’s a process that requires  care and attention, but it’s fairly straightforward once mastered and we can create small runs of high quality boards.

But what about the same process at a professional level, what do you do when your board isn’t a matchbox-sized panel from OSH Park with less than 50 or so parts but a densely-packed multilayer board  about the size of a small tablet computer and with many hundreds of parts? In theory the same process of screen print and pick and place applies, but in practice to achieve a succesful result a lot more care and planning has to go into the process.

This is being written the morning after a marathon session encompassing all of the working day and half of the night. I was hand-stuffing a row of large high-density boards with components ranging from 0402 passives to large QFPs and everything else in between. I can’t describe the board in question because it is a commercially sensitive prototype for the industrial customer of the friend I was putting in the day’s work for, but it’s worth going through the minutiae of successfully assembling a small batch of prototypes at this level. Apologies then, any pictures will be rather generic.

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Fully 3D Printed Snow Blower

December 30, 2016 by 12 Comments

For anyone living in cooler climates, the annual onslaught of snow means many hours shoveling driveways and sidewalks. After a light snow, shoveling might seem a waste of time, while a snow blower would be overkill. If only there were a happy middle ground that required minimal effort; perhaps an RC snow groomer with a 3D printed snow blower would work.

We featured an earlier version of this project last year. This year’s model features a slipper clutch — combined with a differential from a heavy RC truck — to forestall damage to the attachment if you happen to hit any rocks or ice chunks. The blades are also thicker and lack teeth in this iteration, as they would catch on anything hard and shatter the blade more often than not. Designed by [Spyker Workshop] (aka [The_Great_Moo]) the snow blower attaches to the front of RC snow groomer — which is originally meant to act like a plow. Seeing the snow blower attachment in action, we’re inclined to believe that he may be onto something.

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2016: As The Hardware World Turns

December 30, 2016 by 23 Comments

Soon, the ball will drop in Times Square, someone will realize you can turn ‘2018’ into a pair of novelty sunglasses, and the forgotten mumbled lyrics of Auld Lang Syne will echo through New Year’s Eve parties. It’s time once again to recount the last 366 days, and what a year it’s been.

Arduino got into an argument with Arduino and Arduino won. We got new Raspberry Pis. Video cards are finally getting to the point where VR is practical. The FCC inadvertently killed security in home routers before fixing the problem. All of this is small potatoes and really doesn’t capture the essence of 2016. It’s been a weird year.

Want proof 2016 was different? This year, Microsoft announced they would provide a Linux ‘shim’ with every version of Windows. By definition, 2016 was the year of the Linux desktop. That’s how weird things have been in 2016.

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Counting Laps And Testing Products With OpenCV

December 30, 2016 by 34 Comments

It’s been about a year and a half since the Batteroo, formally known as Batteriser, was announced as a crowdfunding project. The premise is a small sleeve that goes around AA and AAA batteries, boosting the voltage to extract more life out of them. [Dave Jones] at EEVblog was one of many people to question the product, which claimed to boost battery life by 800%.

Batteroo did manage to do something many crowdfunding projects can’t: deliver a product. Now that the sleeves are arriving to backers, people are starting to test them in the wild. In fact, there’s an entire thread of tests happening over on EEVblog.

One test being run is a battery powered train, running around a track until the battery dies completely. [Frank Buss] wanted to run this test, but didn’t want to manually count the laps the train made. He whipped up a script in Python and OpenCV to automate the counting.

The script measures laps by setting two zones on the track. When the train enters the first zone, the counter is armed. When it passes through the second zone, the lap is recorded. Each lap time is kept, ensuring good data for comparing the Batteroo against a normal battery.

The script gives a good example for people wanting to play with computer vision. The source is available on Github. As for the Batteroo, we’ll await further test results before passing judgement, but we’re not holding our breath. After all, the train ran half as long when using a Batteroo.

Sansa MP3 Player Runs Doom Unplayably

December 30, 2016 by 25 Comments

DOOM, is there anything it won’t run on? Yes. Your front lawn cannot currently play DOOM. Pretty much everything else can though. It’s a testament to the game’s impact on society that it gets ported to virtually every platform with buttons and a graphical screen.

This video shows a Sansa Clip playing DOOM, but it’s only just barely recognizable. The Sansa Clip has a single color screen, with yellow pixels at the top and grey for the rest of the screen. The monochrome display makes things hard to see, so a dithering technique is used to try and make things more visible. Unfortunately it’s not particularly effective, and it’s difficult to make out little more than the gun at the bottom of the screen.

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