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Complete with build instructions for the design engineer who likes the silly side of inventing things and enjoys building stuff in his and her spare time, these gadgets range from highly silly and impractical to extraordinarily inspirational for your own engineering design work.
Aaron, who works as a computer technician, has an extensive collection of gadgets on his site, ranging from the small and inexpensive such as the LED chaser, to the slightly more advanced and intricate, such as the computerised home.
That's why he created a 40-LED night light to make sure he could see and be seen on his bike. Bill set up a 555 timer IC to generate a continuous on/off timing cycle to alternatively flash two groups of 20 LEDs. His night light operates on four AA batteries, which will keep the road ahead nice and bright, even on the darkest and chilliest of British nights. You can even extend battery life with a second circuit Bill put together that uses a short duty cycle to flash a single set of 30 LEDs.
Driving with high-beam headlights will ensure your visibility in the coming winter months, but they'll blind any driver who's coming from the other direction.
Back in the days of the Berlin Wall, these Nixie tubes were
manufactured by a now long-forgotten company. Fast forward to the
twenty-first century, and Hans Summers found them stocked by an antique
electronics part company.
Originally painted red, the coating
from the 4-inch high tubes were painstakingly removed using a craft
knife. Using a plain matrix board and wire connections, Hans built the
circuit on three boards.
The first holds the rectifier, divide
by 50 circuit, seconds counters and seconds driver transistors. The
second and third boards hold the counters and drivers for the minutes
and hours digit pairs. Now your tribute to East Germany is sure to get
past Checkpoint Charlie.
You can read the full details of the project, including a data sheet for the Z568M and details of the construction, on Hans' website.
The Nixie tube
Hans
used the Z568M, which is 4-inches high (100mm) and has a digit height
of 2 inches (50mm). It is therefore truly a giant amongst nixie tubes,
he says, presumably intended for railway clock applications and so on.
Thanks to Made By Monkeys for highlighting this one - involving a dual-purpose torch / bicycle-light that was eating NiMH cells pretty fast...
Blogger 'Le Magicien' got to work, modding the device. He writes:
I like this torch a lot but... the incandescent bulb eats the NiMH cells pretty fast and the blinking leds... who needs them? So the idea was.. why do not replace the rear red leds with white ones? There's only one problem - white leds do not work with less than 3.2 volts - therefore some kind of voltage booster was needed.
You can read the circuit schematics used in the modified waterproof solar torch, plus some detailed photos of the modification work.
This neat little circuit provides 8 LEDs directly driven from the PIC along with a single mode control switch. The firmware described drives the LEDs with a 5 bit PWM signal providing each of the 8 LED channels with four levels of intensity; off, dim, mid, bright.
A number of sequences are programmed into the firmware to provide some interesting visual effects and chase sequences, including the classic effect seen on the car in the Knight Rider TV series.
Peter says that the design is deliberately simple with each LED being directly driven from a PIC I/O pin. This and the inclusion of an in-circuit programming header (ICSP) make the circuit ideal for teaching/learning introductory PIC assembly language programming.
However, he writes, if you just want a cool LED chaser without having to write any code, a ready written LED chaser program with fully commented source code and programmer ready HEX files is provided at the bottom of this page.
The circuit has been constructed on a PCB but can easily be built on strip-board, or a solderless breadboard.
This month's featured Gadget Master is provided by an old favourite of the blog, Peter Griffiths. He shares all the details necessary to build your own 5 x 5 LED cube.
Construct your own programmed light display
Once again, the project is fully documented in terms of parts and the build process, and Peter provides a number of photos to help navigate construction.
The project also includes a ready to program HEX file with some demo cube animations and also the source code. The firmware implements a simple macro drawing processor command set, so if you've got some programming skills you can create your own animations for the cube, says Peter.
Although the project uses a PCB, the original prototype was constructed on a prototype pad board so if you're not able to make your own PCB it's still possible to make this project yourself.
Thanks to our technology Editor, Steve Bush, for flagging this one. It dovetails nicely with our recent Build your own LED Cube post, and involves the programming of a colour LED array. A Peggy 2 LED matrix display, to be precise.
There are 625 LEDs in total, with red, green, blue and white LEDs making some giant pixels, and the idea is to create something approximating video, via animation of the "RGB pixels". Check out the video.
We flagged this one before - SpikePOV - Bicycle LED persistence of vision - with SpokePOV, or "persistence of vision for your bike", being a way to have a bit of fun driving LED lights to improve your bike's visibility.
Well here's another great video of the system in action, featuring 256 RGB LEDs in a 4-spoke system that apparently mounts into standard bike wheels.
Check out www.monkeylectric.com for more info on what the site describes as the most advanced rotating wheel display system in the world.
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