3 axis Accelerometer with LED bar displays

April 25, 2012 By Leave a Comment

[Viktor] doesn’t remember why he started this project. He doesn’t know what he had in mind in the beginning, nor what the intended use was.He knows he wanted something interactive with blue LEDs.  What he ended up with, was a 3 axis Accelerometer with a pretty cool display that sits on his desk to amuse visitors.

Constructed using a PIC16F887 for the brains and a Freescale MM7361 3 axis  accelerometer, you can pull the schematics from his site. The code is available on demand as well.

[via HackedGadgets]

[Read more…]

Filed Under: hardware Tagged With:

A flight simulator made out of a real 737 cockpit

April 20, 2012 By Leave a Comment

[Trent] sent in an awesome story about a single man who bought the nose of a 737, put it in his garage, and built a flight simulator inside the cockpit. His name is [James Price], and right now the only thing we’re wondering is when we can have a visit.

The cockpit came from an aircraft boneyard in Oklahoma. After [James] plunked down $1500 for the shell of a cockpit, he moved his new toy to a Livermore, California aircraft hangar and eventually into his garage. While the plane is meant to be a simulator, [James] is a tinkerer at heart: he says the best part of building his 737 is building the systems, programming the computers, and making everything work together. We’ve got to admire that.

Of course this isn’t the first cockpit-in-a-garage build we’ve seen. Years ago we featured an Avro Lancaster, and just a few months ago we saw a strikingly similar replica 737 flight deck (it’s made out of wood, and not a real 737). [James]’ build is one of the very few home-built simulators made out of a real airplane. Someone get this guy an F15 cockpit stat.

Filed Under: hardware Tagged With: , ,

Measuring the capacities of different battery brands

April 9, 2012 By Leave a Comment

Being the smart consumer he is, [Denis] usually looks at the price per pound when comparing similar products at the grocery store. When it came time to buy a few AA batteries, he didn’t have any data to go on. To solve his little conundrum, [Denis] decided he would test several brands of batteries and see which one gives him the most bang for the buck.

After bringing home a haul of a dozen different brands of AA cells, [Denis] broke out the Arduino and starting designing a circuit. To test how much energy each brand provides, the Arduino measures the voltage across a load every second until the battery reaches 0.2V. The elapsed time, as well as the voltage, Watt hours, Joules, and ambient temperature are logged on an attached LCD screen and sent over a USB serial link to automate the data collection process.

What’s the verdict? Unsurprisingly, words like ‘super,’ ‘max,’ and ‘ultra’ didn’t connotate a better battery. The best bang for the buck came from an off-brand called RS Power Ultra. The worst battery was the Panasonic Evolta cells that came in at about $1.50 USD per watt-hour.

If you’d like to verify [Denis]’ work, all the code is up on Github along with the schematic.

Filed Under: arduino hacks, hardware Tagged With: , , ,

Projecting video directly onto the retina

April 9, 2012 By Leave a Comment

With the head-mountable, augmented reality Google Glass capturing tons of attention in the press, it was only a matter of time before we saw a DIY retina projector. This isn’t a new build; [Nirav] has been working on it for a few months, but it might just be time for this information to be useful to someone.

A retina projector focuses laser light though beam splitters and concave mirrors to create a raster display on the back of your eye. There’s an incredible amount of research into this field, but not many DIY projects. To make this project a reality, [Nirav] picked up a SHOWWX laser video projector and mounted it in a 3D printed frame along with a few pieces of optical equipment.

[Nirav]’s build isn’t without its drawbacks, though. The exit pupil, or the apparent size of the image, is only about 1.5 mm wide and much too small to be of any real use. Also, commercial retina projectors have an output of a puny 2 microwatts, where [Nirav]’s laser projector puts out 200 millwatts. This is more than enough to permanently damage your eye.

Filed Under: hardware, portable video hacks Tagged With: , ,

Build an induction heater and become a metalsmith

April 8, 2012 By Leave a Comment

If you’ve ever wanted to forge, cast, or smelt metal, this project is right up your alley. It’s a 30 kVA induction heater built by [bwang] over on Instructables. It gets hot enough to melt and forge steel, iron, and aluminum.

An induction heater operates by surrounding the object to be heated with a coil carrying high frequency AC current. Basically, the entire setup acts like a huge transformer with a shorted secondary. To get these currents into a workpiece, [bwang] used a TL494 PWM controller as an oscillator. The output of the TL494 is filtered and amplified a few times to generate a huge amount of AC current.

Larger versions of [bwang]’s induction heater are found in foundries and forges all across the land; even though this small version sucks down 50 A out of a dryer or stove outlet, induction heating is very efficient. We’re actually wondering why we don’t see many home blacksmiths using induction heating, so we’ll leave that for our readers to discuss in the comments.

[sessions] reminded us of this induction heater from a few years ago. A little smaller, but still usable.

Filed Under: hardware, misc hacks Tagged With: , , , , ,

GSM modem means wireless serial connections

April 6, 2012 By Leave a Comment

By now, most of us have seen have seen one of those GSM to wi-fi hotspot bridges. They’re interesting devices, and being able to carry a small wireless router with you at all times is very handy. Surprisingly, we haven’t seen many builds featuring these portable wireless hotspots, something probably due to the effort in breaking out a serial connection on these devices. The people at Open Electronics decided to build their own small serial-enabled cell phone modem, a boon to someone wanting a serial connection to any place with a cell tower.

The Open Electronics GSM/GPRS/GPS modem includes a header for an FTDI USB serial chip and a GSM module. Plug one into your computer and after a few short commands into a terminal, you’ve got a serial connection to nearly anywhere in the world.

The cost of the setup is a little high – around 80€ or $100 USD – and you probably should buy more than one so you can also receive data. While it is more expensive than the XBee wireless boards we see often, this GSM modem isn’t limited to the 300 foot range of the XBee. We’ll probably see this in a high altitude balloon before too long.

Filed Under: cellphones hacks, hardware Tagged With: , , ,
« Older Posts
Newer Posts »