RC Truck Has Working Windows, Steering Wheel, And Much More

November 27, 2012 by 23 Comments

This truck is not simply a drive train and a radio module. Great care was taken to fabricate every part to work like a full-sized vehicle. NSFW WARNING: The forum on which the details have been posted is Russian and may have sidebar ads you don’t want on your screen at work. That being said, here’s the link (translated).

The build starts with a custom-made frame which looks like it’s aluminum. The gearbox is assembled from a huge number of parts, with power is transferred to the wheels through a proper differential. But hey, why not go that extra mile? The rope and hook hanging off the front are connected to a functional winch. The doors have windows that crank down, the steering wheel moves when the wheels turn, and where would this thing be without windshield wipers and headlights? Don’t miss the pair of demo videos after the break.

We remember seeing a pretty neat stirling engine come out of the same forums earlier this year.

Continue reading “RC Truck Has Working Windows, Steering Wheel, And Much More” →

Spare Parts Pulled Together Into A Nixie Clock

November 27, 2012 by 6 Comments

We’d like to dig around in [Small Scale Research’s] parts bin. Apparently there’s good stuff in there because he managed to build this Nixie tube clock using mostly leftovers.

The chip driving the device is an ATtiny1634. We weren’t familiar with it so here’s a datasheet (pdf) if you’re curios as well. The microcontroller communicates with an old GPS module in order to keep perfect time. There is an external antenna for it which connects through the hole next to the red switch seen above. The high voltage driver is a repurposed backlight inverter which is fed 12V power from an old laptop supply.

The album linked above shows the build quite well and even includes full schematics. There are some fireworks when he encountered an issue with a pretty large cap shorting to a resistor leg. If this isn’t enough juicy detail for you there are a few more nuggets shared in the Reddit comments.

DIY TSA Backscatter Body Scanner

November 27, 2012 by 39 Comments

[Ben Krasnow] built his own version of the TSA’s body scanner. The device works by firing a beam of x-rays at at target. Some of the beam will go through the target, some will be absorbed by the target, and some will reflect back. These reflected x-rays are called ‘backscatter‘, and they are captured to create an image.

In [Ben]’s setup a rotating disk focuses x-rays into beams that travel in arcs across the X-axis. The disk is moved along the Y-axis to fill in the scan. On the disk assembly, there is a potentometer to measure the y-axis position of the beam, and an optical sensor to trigger an oscilloscope, aligning the left and right sides of the image. Using these two sensors, the scope can reconstruct an X-Y plot of the scan.

To detect the x-rays, a phosphorous screen turns the backscattered x-rays into visible light, and a photo-multiplier amplifies the light source. A simple amplifier circuit connects the photo-multiplier to a scope, controlling the brightness at each point.

The result is very similar to the TSA version, and [Ben] managed to learn a lot about the system from a patent. This isn’t the first body scanner we’ve seen though: [Jeri Ellsworth] built a microwave version a couple years ago.

The impressive build does a great job of teaching the fundamentals of backscatter imaging. [Ben] will be talking about the project at EHSM, which you should check out if you’re in Berlin from December 28th to the 30th. After the break, watch [Ben]’s machine scan a turkey in a Christmas sweater.

Continue reading “DIY TSA Backscatter Body Scanner” →

Pulse Oximeter Displays Blood Oxygen Levels On A PC

November 27, 2012 by 30 Comments

The last time you were in the emergency room after a horrible accident involving a PVC pressure vessel, a nurse probably clipped a device called a pulse oximeter onto one of your remaining fingers. These small electronic devices detect both your pulse and blood oxygen level with a pair of LEDs and a photosensor. [Anders] sent in a great tutorial for building your own pulse oximeter using a fancy ARM dev board, but the theory behind the operation of this device can be transferred to just about any microcontroller platform.

The theory behind a pulse oximeter relies on the fact that hemoglobin absorbs red and infrared light differently based on its oxygenation levels. By shining a red and IR LED through a finger onto a photoresistor, it’s possible to determine a person’s blood oxygen level with just a tiny bit of math.

Of course a little bit of hardware needs to be thrown into the project; for this, [Anders] used an EMF32 Gecko starter kit, a great looking ARM dev board. After connecting the LEDs to a few transistors and opamps, [Anders] connected his sensor circuit to the ADC on the Gecko board. From here it was very easy to calculate his blood oxygen level and even display his pulse rate to a PC application.

Yes, for just the price of a dev board and a few LEDs, it’s possible to build your own medical device at a price far below what a commercial pulseox meter would cost. FDA approval not included.

Kickstarter Incurs The Wrath Of Arduino Creator

November 27, 2012 by 183 Comments

[Massimo], one of the creators of the Arduino, is a little perturbed over what passes for the truth over on Kickstarter.

While [Massimo] does recognize that Kickstarter can be a force of good launching garage-designed projects into the hands of willing consumers, he noticed something was a little fishy with the recent smARtDUINO kickstarter (notice the capital letters, by the way). Right near the top of the smARtDUINO’s kickstarter page is the phrase, “For years we manufactured the ARDUINO in Italy. Now we created a new Open System: modular, scalable, the world’s cheapest and smallest!”

Being at the top of the Arduino organization, you’d think [Massimo] would have heard of these former Arduino manufacturers. The name didn’t ring a bell to him, so he called up the factory. No one at the factory had heard of them, and after a long search it was finally revealed the head of the smARtDUINO project hired two factory workers who worked for a supplier the official Arduino manufacturer uses.

[Massimo] makes the comparison of, “if he hires two factory workers from Ford he can claim he used to manufacture Ford cars.” We’re thinking that’s a little generous. It’s more like hiring two people who used to restock the vending machines in a Foxconn plant and claiming you used to build Apple computers.

With a simple trademark infringement on his hands, [Massimo] contacted Kickstarter to see what could be done. Kickstarter replied:

Thanks for writing in and bringing this to our attention. This is a matter that must be taken up directly with the project creator. You can contact them by clicking “Contact me” on the project page.
Best,
Kickstarter

For [Massimo], and us, that’s just not a sufficient answer. We’re thinking Kickstarter has an obligation to vet their projects and make sure the creators of these projects are who they say they are.

But enough about what we think. What do you, the Hackaday reader, think about this situation?

[Prusa]’s Nozzle Prints Polycarbonate, PEEK, & Nylon

November 27, 2012 by 42 Comments

Oh, we’ve been sitting on this one for a while.

[Josef Prusa], brainchild behind what is probably the most popular 3D printer, has just unleashed a new hot end that is capable of printing objects in polycarbonate, PEEK, and nylon.

This new hot end is completely made out of stainless steel – there are no plastic parts made out PTFE or PEEK to keep the heat from transferring up to the extruder. Because the Prusa Nozzle can print these plastics, it’s also now possible to print parts for other hot ends such as the J Head and the Budaschnozzle.

We ran into [Prusa] at NYC Maker Faire a few months ago, and he was kind enough to go over the advancements in his new nozzle and new i3 printer. So far, it looks like the lack of a PEEK insulator isn’t doing the new hot end any harm – [Prusa] has left molten plastic in the nozzle for a few hours and nothing bad has come of it.

You can check out the interview below.

[youtube=www.youtube.com/watch?v=fzFpMZE366Q]

Again, thanks to [Prusa] for granting us an interview and providing some free advertising for Hackaday’s hosts for the NYC Maker Faire. Before you complain about the delay in getting this interview out to you, don’t worry; I slapped a few Makerbot stickers on the back of [Prusa]’s jacket. Everything’s cool.

Hola! From A Spanish Speaking Drawing Arm

November 27, 2012 by 11 Comments

[Acorv] wrote in to tell us about his latest hack, a robotic arm that writes with a marker. In the video after the break, the arm is set to copy whatever someone writes in a touchpad. As you might guess from this video, the hack is written up in Spanish, but it’s nothing your favorite translator can’t handle if you don’t speak the language.

This robot it the result of improvements on his first drawing arm ‘bot featured here. The basic kinematics stayed the same in the arm’s second iteration, but the resolution was greatly improved by using belts to achieve a gear reduction. The second build also features mechanical reinforcement with an Erector-set style building set known as [Mekanex].

A simple hobby servo moves the marker up or down, and control is achieved through, you guessed it, an Arduino with a motor shield! Although from a different time, the way this arm is used is reminiscent of a mechanical writing automaton from long ago. Continue reading “Hola! From A Spanish Speaking Drawing Arm” →