LED Cube In An Elongated Cube Be Jammin’

July 26, 2014 by 8 Comments

LED cube and drive electronics inside an acrylic case

We get a lot of tips about LED cubes. They’re a great build to explore a lot of different things, from the circuit design, to current source and sink, and of course there’s the firmware. Why don’t we see a million of them on the front page? Well, we have seen a lot, but most of what is sent our way doesn’t exhibit such a clean build. It’s obvious that [Justin] took a lot of pride in his work on this 4x4x4 single-color cube.

Hidden away under one of the protoboards is an Arduino that drives it. A lot of the components were salvaged from the e-waste bin at his University. This includes the 12V AC wall wart he uses to power the device. A bridge rectifier converts to DC, and in addition to powering the LEDs there are a couple of USB charging ports. After the break you can see and hear it in action. The cube pulses to the music but the flip of a switch will disconnect the speaker if you want some peace and quiet to go with the light show.

If you’re looking for a challenge, this 8x8x8 RGB offering is several orders of magnitude harder to pull off… block out a lot of extra time if you do decide to take the plunge. We also heard that [Benchoff] might try to make a cube with some of those through-hole ws2812 pixels.

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Electric Go-Cart Has Arduino Brains

July 26, 2014 by 16 Comments

arduino powered go cart

Oh how times have changed. Back in the 30’s the VW Beetle was designed to be cheap, simple and easy for the typical owner to maintain themselves. Nowadays, every aspect of modern cars are controlled by some sort of computer. At least our go-carts are spared from this non-tinkerable electronic nightmare…. well, that’s not completely true anymore. History is repeating itself as [InverseCube] has built an electronic go-cart fully controlled by an Arduino. Did I forget to mention that [InverseCube] is only 15 years old?

The project starts of with an old gas-powered go-cart frame. Once the gas engine was removed and the frame cleaned up and painted, a Hobbywing Xerun 150A brushless electronic speed controller (ESC) and a Savox BSM5065 450Kv motor were mounted in the frame which are responsible for moving the ‘cart down the road. A quantity of three 5-cell lithium polymer batteries wired in parallel provide about 20 volts to the motor which results in a top speed around 30mph. Zipping around at a moderate 15mph will yield about 30 minutes of driving before needing to be recharged. There is a potentiometer mounted to the steering wheel for controlling the go-cart’s speed. The value of the potentiometer is read by an Arduino which in turn sends the appropriate PWM signal to the ESC.

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Control This Pedestrian Walk Signal Online!

July 26, 2014 by 6 Comments

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[Jon Bennett] is an electrical engineer who specializes in embedded systems software. He was the first employee of Pebble Technology and the lead developer of the inPulse Smart Watch. He has studied at the University of Waterloo during which he completed several interesting internships, including working on Bluetooth and WiFi embedded software for the iPhone (Apple, 2007). Now, he has hooked up this pedestrian walk signal — picked up at an electronics surplus store — to the internet.

The web-enable project utilizes a Spark Core Wifi Module, which is an Arduino-like micro-controller with more power, to wirelessly connect to the device. With the click of a button, the hand signal can be flashed. The walking illuminated man can be triggered with another press. Messages can be sent scrolling across the LED’s flashing by in sets of two simply by hitting enter.

All the source code has been posted on Github in case anyone wants to create their own.

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[Jon]’s previous work can be found in a few of our featured articles from a couple of years ago. There’s the Thrift Shop Wifi Router Robot he made that could be controlled through the internet. He also built this interactive bubble music visualizer, and this programmable RC car that can be driven by a computer.

What will he think of next??

Hackaday logo with the words "4-Minutes to Entry"

4-Minutes To Entry

July 26, 2014 by 20 Comments

If you think it’s too much work to write about your projects you’re simply wrong, and I’m going to prove it to you.

The first of this set of videos walks though the steps for submitting an official entry… I did it in under 4 minutes.  The second clip covers the extra details you need to post to meet the requirements for the first cutoff on August 20th.

This is the bare minimum needed for your project to be reviewed by the judging panel. But here’s the thing: get your basics down early, then refine as you go along. The Hackaday Prize celebrates the journey of developing interested connected devices. From now until November you should be working on the build and adding to infor to your project post as you go.

Did we mention your odds of winning this thing are really good?

Ask Hackaday: Graphene Capacitors On Kickstarter

July 26, 2014 by 140 Comments

Last week, we heard of an interesting Kickstarter that puts a capacitor and charging circuit in the same space as a AA battery. This is usually a very simple endeavour, but this capacitor has the same energy density as an alkaline cell. The chemistry inside this capacitor was initially attributed to lithium ion, and a few people in the comments section were wondering how this was possible. The math just didn’t seem to add up.

The guy behind this Kickstarter, [Shawn West], recently spilled the beans on these… interesting capacitors. Apparently, they’re not lithium ion capacitors at all, but graphene capacitors. Graphene capacitors you can buy. On Kickstarter. Graphene capacitors, also known as the thing that will change everything from smartphones to electric vehicles, and everything in between. I will admit I am skeptical of this Kickstarter.

Apparently, these graphene supercaps are in part designed and manufactured by [Shawn] himself. He fabricates the graphene by putting graphite powder in a ball mill for a day, adding a bit of water and surfactant, then running the ball mill for another few days. The graphene then floats to the top where it is skimmed off and applied to a nonconductive film.

There’s absolutely nothing that flies in the face of the laws of physics when it comes to graphene capacitors – we’ve seen a few researchers at UCLA figure out how to make a graphene supercap. The general consensus when it comes to graphene supercaps is something along the lines of, ‘yeah, it’ll be awesome, in 10 years or so.’ I don’t think anyone thought the first graphene capacitors would be available through Kickstarter, though.

I’m a little torn on this one. On one hand, graphene supercaps, now. On the other hand, graphene supercaps on Kickstarter. I’m not calling this a scam, but if [Shawn]’s caps are legit, you would think huge companies and governments would be breaking down his door to sign licensing agreements.

Post your thoughts below.

Pwning Timberman With Electronically Simulated Touchscreen Presses

July 26, 2014 by 19 Comments

arduino-plays-timerman

What do you do if you suck at a smartphone game? Buy some in-game upgrades to pretend like you’re good? Screw that! [Valentin] did what any self-respecting hacker would: developed an automated system to play for him.

Granted, when you see the demo video embedded below you’ll realize there isn’t much strategy involved in this game. But that setup to simulate the touchscreen presses is pretty neat. We’re used to seeing mechanical touchscreen hacks but this one is electronic, using a couple of pads of copper foil tape and some relays to make it happen. Here’s the one caveat: you still need to be touching something with your hand. This just uses the relays to switch the connection between the pads and your body.

We’ve looked around for this before. Does anyone have a cheap, simple, and effective hack to fully automate presses on a modern touchscreen? Can we use a potato or something? Tell us below, but send it in to the tips line too!

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Hats With Sunblock Reminders Are Easy To Make

July 26, 2014 by 14 Comments

light_sunscreen-reminder-hat-00

Just about anyone can build this UV index sensing wearable that detects heat rays from the sun and reminds the user to put on sunscreen. There is no soldering required, which makes this a nice beginners projects for those unfamiliar with hooking up electronic sensors.

All that is needed is a FLORA main board, one UV index sensor, a piezo Buzzer, a 500mAh lipoly battery, 2-ply conductive thread, a couple of household tools, and your favorite summer’s hat.

Once the materials have been rounded up, the rest of the process is relatively simple. Threading the FLORA in and place and connecting the Piezo only takes a few minutes. Then the UV sensor is added allowing the hat to start collecting data. A little bit of coding later, and the whole system is ready to be worn out in the sun.

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What’s great about this project is that the hat can be programmed to play a song when it is time to apply more sunscreen. Everyone from beach bums, to sun-bathing beauties, to music festival attendees will be able to find this hat useful. And, it is cheap and easy to make.

The video on the Adafruit tutorial page shows how simple it is to rig up the system.

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