Day: July 29, 2015

Hackaday Prize Entry: SnapVCC

July 29, 2015 by 59 Comments

While it’s the easiest way to lay out a simple circuit for prototyping, breadboards are a pain. They are the ultimate kludge; they work well enough, but no one will ever say that a solderless breadboard is the most elegant solution.

[Mahesh] isn’t completely fixing the problems of solderless breadboards, but he has come up with a better way to supply power to breadboards. It’s a project called snapVCC, and it turns a 9 volt battery into a regulated 3.3 or 5 volt supply.

The idea behind snapVCC is simple enough; just add a circuit board to the top of a nine volt and add a voltage regulator. [Mahesh] is using an LM317 adjustable regulator, with a switch to change the output voltage from 3.3 to 5 volts. An LED indicates the output active, and another switch disconnects the battery from the circuit. Yes, it’s very simple and very useful, confounding everyone who is wondering why this project didn’t already exist.

The 2015 Hackaday Prize is sponsored by:

Rescuing a Drone with a Drone

Operation Drone Rescue

July 29, 2015 by 58 Comments

When [Harrison Howes] lost his Syma X5C drone on a neighbor’s roof, he thought all hope was lost. There was no easy access to get up there, and the neighbor wasn’t interested in him attempting a rescue. Months past, and [Harrison] got a new quad. And not just any quad — a DJI Phantom 3 Professional. It was time to attempt an aerial rescue operation!

Using some old coat hangers and some green painter’s tape for visibility, [Harrison] crafted two hooks to hang below the Phantom. He also tilted the FPV module straight down for maximum visibility of the rescue.

Set to the soundtrack of No Time for Caution by Hans Zimmer (from Intersteller), watch our hero deftly air lift his old quad off the roof and back to safety.

Continue reading “Operation Drone Rescue” →

NES Reborn As Nexus Player And NES

July 29, 2015 by 8 Comments

Anyone who has a Raspberry Pi and an old Nintendo has had the same thought. “Maybe I could shove the Pi in here?” This ran through [Adam’s] head, but instead of doing the same old Raspberry Pi build he decided to put a Nexus Player inside of this old video game console, with great success. Not only does it bring the power of a modern media player, it still works as an NES.

If you haven’t seen the Nexus Player yet, it’s Google’s venture into the low-cost home media center craze. It has some of the same features of the original Chromecast, but runs Android and is generally much more powerful. Knowing this, [Adam] realized it would surpass the capabilities of the Pi and would even be able to run NES emulators.

[Adam] went a little beyond a simple case mod. He used a custom PCB and an Arduino Pro Micro to interface the original controllers to the Nexus Player. 3D printed brackets make sure everything fits inside the NES case perfectly, rather than using zip ties and hot glue. He then details how to install all of the peripherals and how to set up the Player to run your favorite game ROMs. The end result is exceptionally professional, and brings to mind some other classic case mods we’ve seen before.

Old Kindle Upcycled To Emailable Fridge Messageboard

July 29, 2015 by 15 Comments

We’ve all got a pile of old devices lying around somewhere that are waiting to be torn down for parts, or turned into something useful. [Peter Voljek] decided to do the latter with an old Kindle eBook reader, turning it into a neat message board that can be stuck onto a fridge. With the addition of some server-side Ruby code, you can send messages to this by email, and it automatically displays the last message received. Throw on some magnetic sticky tape and you have a neat fridge door noticeboard.

[Peter] runs his Ruby web server on a Raspberry Pi, but it should run on any platform that supports Ruby, so you could run it on a NAS device, or pretty much anything that has a web server built in. The Kindle side of the hack exploits some secret commands to disable the screensaver, then uses AJAX and JavaScript to automatically refresh the webpage the RPi is serving.

Hey, why not combine this with the Kindle weather station hack to create a noticeboard that tells you what you need from the store, and reminds you why you shouldn’t leave the house at the same time?

Review: Single Board 65C02 And 65C816 Computers

July 29, 2015 by 51 Comments

The 6502 is a classic piece of computing history. Versions of this CPU were found in everything from the Apple ][, to the Nintendo Entertainment System, and the Commodore 64. The history of the 6502 doesn’t end with video games; for the last forty years, this CPU has found its way into industrial equipment, medical devices, and everything else that doesn’t need to be redesigned every two years. Combine the longevity of the 6502 with the fact an entire generation of developers first cut their teeth on 6502 assembly, and you have the makings of a classic microprocessor that will, I’m sure, still be relevant in another forty years.

The cathedral of The 6502 is Western Design Center. For more than 35 years, WDC has been the home of 6502-related designs. Recently, WDC has been interested in the educational aspects of the 6502, with one of the VPs, [David Cramer], lending his time to an after-school club teaching opcodes.

The folks at WDC recently contacted me to see if I would give their hardware a close look, and after providing a few boards, this hardware proved to be both excellent. They’re great for educators adventurous enough to deviate from the Arduino, Processing, and Fritzing zeitgeist, and for anyone who wants to dip their toes into the world of 65xx development.

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University Peristaltic Pump Has Hacker Heritage

July 29, 2015 by 27 Comments

A team at [Vanderbilt University] have been hacking together their own peristaltic pumps. Peristaltic pumps are used to deliver precise volumes of fluid for research, medical and industrial applications. They’re even occasionally used to dose fish tanks.

pumpThey work by squeezing the fluid in a flexible tube with a series of rollers (check out the awesome gif from Wikipedia to the right). We’ve seen 3D printed peristaltic pumps before, and cheap pumps have been appearing on eBay. But this build is designed to be lab grade, and while the cheap eBay devices can deliver ~20ml/min this one can deliver flow rates in the microliter/min range. It also has a significant cost advantage over commercial research grade pumps which typically cost thousands of dollars, each of these pumps costs only fifty bucks.

The pump has a clear hacker heritage, using an Arduino Uno, Adafruit Motor shield, and 3D printed mechanical parts. So it’s particularly awesome that they’ve also made their design files and Arduino code freely available!

Continue reading “University Peristaltic Pump Has Hacker Heritage” →

Say It With Me: Input Impedance

July 29, 2015 by 37 Comments

In the “Say It with Me” series, we’ll take a commonly used concept out of electronics and explain it the best we can. If there’s something that’s been bugging you, or a certain term or concept that keeps cropping up in your projects, let us know. We’ll write about it!

What’s up with input impedance? You hear people talking about it, but why does it matter? And impedance matching? Let’s break it all down.

First of all, impedance is the frequency-dependent sister of resistance, so for intuition we’ll first work through the cases of purely resistive impedance. And that’s almost fine if you’re only ever working at one frequency. We’ll hint at the full-blown impedance = resistance + reactance version at the end, but it’s really its own topic. For now, pretend that your circuits aren’t reactive.

Continue reading “Say It With Me: Input Impedance” →