World Maker Faire was host to some incredible projects. Among the favorites was Nixie Rex [YouTube Link]. Nixie Rex is actually a Panaplex display, since it’s glow comes from 7 planer segments rather than 10 stacked wire digits. One thing that can’t be contested is the fact that Rex is BIG. Each digit is nearly 18 inches tall!
Nixie Rex was created by [Wayne Strattman]. Through his company Strattman Design, [Wayne] supplies lighting effects such as plasma globes and lightning tubes to the museums and corporations. Nixie Rex’s high voltage drive electronics were created by [Walker Chan], a PHD student at MIT. Believe it tor not the entire clock runs on an ATmega328P based Arduino. The digits are daisy chained from the arduino using common Ethernet cables and RJ45 connectors. A Sparkfun DS1307 based real-time clock module ensures the Arduino keeps accurate time.
[Wayne] and Rex were located in “The Dark Room” at Maker Faire, home to many LED and low light projects. The dim lighting certainly helped with the aesthetics, but it did make getting good photos of the clock difficult. Long time Hackaday tipster [Parker] graciously provided us with a size reference up above.
Click past the break to see a closeup of that awesome cathode glow, and a video of the Nixie Rex in action.
Continue reading “World’s Largest “Nixie” Clock at World Maker Faire”
Looking for a new clock but hate the fact that all the numbers are always in the correct order? Look no further than [Andy]’s topsy turvy clock which correctly tells time despite the fact that the numbers on the face of the clock are in random positions.
At first glance, the clock looks fairly normal despite the mixed-up numerals. Upon closer inspection, the clock is much more than it appears to be. A battery backed real-time clock keeps track of time, and a microcontroller turns the hands of the clock to where they need to be. The clock uses optical sensors to make sure the hands are in the correct starting position when it is first powered on.
Check out the video below for a better illustration of what the clock looks like when in operation. The hour hand is always pointing at the correct hour, and the minute hand starts every five minutes at the number it would have started at on a normal clock, i.e. at 1:15 the hour hand will point at “one” and the minute hand will point at “three”.
We love this very interesting and unique take. It was inspired by a few other clocks, including a version of the infamous Vetinari “random tick” clock which will drive you crazy in a different way.
Freescale was very kind to Hackaday at Maker Faire this weekend, showing off a few boards and answering a few questions about why old Motorola application notes aren’t available on the Internet.
The Hummingboard from SolidRun comes in an oddly familiar form factor to anyone who has ever handled a Raspberry Pi. It also has an interesting feature: the CPU is on a small module, allowing anyone to upgrade the chipset to something significantly more powerful. In the top of the line configuration, it has a two core iMX6 CPU with a Gig of RAM, LVDS output, and Gigabit Ethernet. All the complex bits for this board are on a single module, allowing anyone to take the module and put it in another project, a la the Intel Edison.
Also in the Freescale booth was the pcDuino, a dual core ARM Cortex A7 with Ethernet, WiFi, and a SATA, with Arduino form factor pinouts. It’s a somewhat niche product, but being able to stack shields on something comparable to a Raspi or BeagleBone is a nice feature.
[Trey German] from Texas Instruments showed off some very cool stuff, including a quadcopter board for a Launchpad microcontroller. This isn’t a board with an IMU and a few servo outputs; this is the whole shebang with a frame, motors, and props. The frame was cut from some odd composite that’s usually used for road signs, and even though it wasn’t flying at the Faire (nothing was flying, by the way), it’s pretty light for a quad made at a board house.
Also from TI was their CC3200 dev board. This is a single chip with an ARM Cortex M4 and a WiFi radio that we’ve seen before. The CC3200 runs TI’s Wiring/Arduino inspired development environment Energia, and at about $30 for the CC3200 Launchpad board, it’s an easy and cheap way to build an Internet of Things thing.
Are you tired of hammering out the same commands over and over again in GDB? If not, we highly encourage you take more advantage of The GNU Project Debugger, which is a fantastic way to poke around inside your microcontrollers while they’re running a program.
Back to the matter at hand. [Stef] put together a Python program that leverages GDB’s Remote Serial Protocol. He calls it pyrsp and the talk he recently gave about it can be seen below.
The core feature is the ability to add a callback in your C code that triggers the Python script. Think of this a little bit like a print statement, except you have so much more power since it’s Python and GDB doing the “printing”. Anything that can be done at a breakpoint in GDB can now be executed automatically. So if you need to check a group of registers at every loop execution for hundreds of loops your wrists are going to thank you. Better yet, you can use Python to do the sanity checks automatically, continuing when the data is good and alerting you when it’s not. Neat!
Continue reading “Scripting Debug Sessions: Python for GDB Remote Serial Protocol”
Lulzbot, or more specifically Aleph Objects, had a booth at Maker Faire this year, and unlike a lot of other 3D printer manufacturers they’re not afraid to show off what they currently have in development. The latest is code-named Begonia, although when it makes it to production it will probably be called the Lulzbot Mini. It’s a smaller version of their huge Taz 3D printer that trades build volume for a lower price.
The Lulzbot Mini will have a 6x6x6 inch build volume, heated bed, and all the other features you would expect in its larger counterpart. One interesting feature is automated nozzle cleaning and bed leveling. At the start of every print run, the nozzle runs over a small felt pad at the back of the build plate, touches off four metal washers at each corner, and recalculates the GCode for a level print. You can check out a demo of that in the video above.
Also in the works in the Lulzbot labs is a controller panel with an SD card, display, and (I think) a touch interface. Lulzbot didn’t have a demo of this, but rest assured, we’ll post something on that when it’s released. The last time we saw Lulzbot we heard of a 3D scanner project they’re working on that will turn any physical object into an .STL file, without having to mess about in Meshlab. Development on this project is stalled, but that is a very difficult problem. Can’t fault them for that.
Oh, the price for the unannounced Lulzbot Mini? Somewhere around $1300-1400.
Continue reading “Lulzbot & Lime Green Begonias”
Fashioning a custom, one-off rubber part for your project isn’t usually an option, but [Ben Krasnow] has an alternative to injection molding and casting: machining frozen rubber.
As [Ben] points out, you can’t exactly pop a sheet of rubber on your mill and CNC the needed shape; the bit will push the material around rather than cut it. Freezing the rubber first, however, allows you to carve into the now-hardened material.
His initial setup consisted of a sheet of aluminum with water drizzled on top, a square of neoprene placed on the water, and a steady stream of -60 to -80C alcohol flowing directly onto the rubber. The water underneath freezes, holding the neoprene in place. This proved problematic as the ice-clamp gives way before the milling is complete. [Ben] later adds some bolts to clamp the pieces down, allowing the milling process finish as planned.
A small plastic tray sits underneath this assembly to capture the alcohol as it runs off, feeding it back with some tubing. [Ben] recommends against a submersible aquarium pump—his initial choice—because the pump stopped working after a few minutes immersed in the chilly alcohol. An external, magnetically-driven pump solved the problem although it does require manual priming.
Stick around after the jump for the video and check out some of [Ben’s] other projects, like his quest for the perfect cookie, or CT scanning a turkey.
Continue reading “Cryogenic Machining: Custom Rubber Parts”
There are a ton of apps out there for taking notes and recording ideas, but sometimes the humble pen is best. However, if you have the tendency to lose, crumple, or spill caffeinated beverages on your pen and paper notes, having a digital copy is quite nice.
The NoteOn Smartpen by [Nick] aims to digitize your writing on the fly while behaving like a normal pen. It does this by using the ST LSM9DS0TR: a 9-axis inertial measurement unit (IMU). These inertial measurements are processed by a STM32 Cortex M4F processor and stored on the internal flash memory.
To retrieve your notes, the Nordic nRF8001 Bluetooth Low Energy radio pairs the MCU with a phone or computer. The USB port is only used to charge the device, and the user interface is a single button and LED.
The major hardware challenge of this device is packaging it in something as small as a pen. Impressively, the board is a cheap 2 layer PCB from OSHPark. The assembled device has a 10 mm diameter, which is similar to that of ‘dumb’ pens.
The NoteOn doesn’t require special paper, and relies only on inertial measurements to reconstruct writing. With the hardware working, [Nick] is now tackling the firmware that will make the device usable.
The project featured in this post is a quarterfinalist in The Hackaday Prize.