Hot Wheels Toy Turned Radar Gun

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[Ken] was strolling through a department store one day looking for a gift for his daughter when he stumbled across a Mattel’s Hot Wheels Radar Gun for $30. He purchased it, took it home, and tested it out. Surprisingly, the device had the ability to not only scan toy cars, but also regular size vehicles, spinning bicycle wheels, and joggers as well. As his mind began to churn coming up with new ideas, he purchased another toy and repackaged it creating a more professional grade DIY radar speed detector.

The process was pretty simple. First, he disassembled the device getting to the Doppler radar system inside, which was similar to the professional radar guns that police officers used. This toy was able to transmit a continuous wave at 10.525GHz, measuring the returning frequency of returning waves that bounced off of moving objects. However, the detection range of this toy was severely limited. [Ken] then upgraded the antenna housing unit with a 3″ diameter acrylic document tube, making the quality look a lot better. After that, the system was attached to a tripod allowing for the device to be easily transported and setup near a busy traffic road, quietly watching the speed of cars driving by.

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Robotic Scalextrics

scalectrics

At the Volkswagen factory there are two towers – AutoTürme – filled with gigantic robots lifting cars into parking spaces. It’s by far the most efficient way of putting a huge number of cars in a small footprint. Slot cars exist, so how about a completely overwrought yet entirely awesome robotic parking garage for 1:32 scale cars? (.es, Google translatrix)

The project is built around several ‘racks’ to hold cars arranged around a central elevator. An Arduino takes care of moving all the motors and reading all the sensors, with the basic idea behind the project being the ability to select a car and have it appear in the pit of the track a few moments later.

Although this is just one small part of what is already a very impressive slot car track, it is however the most electronic. Other unique additions include a very unique cantilever/suspension bridge and the usual modeling techniques of creating a landscape with little more than cardboard and glue.

The best way to get a sense of how cool the parking garage is through the video. You can check that out below.

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LEGO and Arduino meet Han Solo

lego blaster gif

This full-size replica blaster from Star Wars, most iconically used by Han Solo and Princess Leia, has everything. Flashing LEDs, blaster noises, LEGO, and yes, even an Arduino. Not bad for [Baron von Brunk]‘s first project to use an Arduino!

The blaster was based on electronics and LEGO that were lying around and was intended for use for Star Wars Day 2014. (May the Fourth be with you.) “Lying around” in this sense might be a bit of an understatement for [Baron von Brunk], as the design of the blaster required the use of the LEGO Digital Designer and 400 blocks, some of which are quite rare.

The electronics for the project are tied to a moving trigger mechanism (also made from LEGO). The trigger mechanism hits a momentary pushbutton which tells the Arduino to activate the LEDs and a separate 555 timer and sound recording/playback device which handles the classic blaster sounds. The whole thing is powered by a 9V battery and housed in the front of the blaster, and all of the code (and the LEGO schematics) are available on the project’s site.

This is quite an impressive replica, and the craftsmanship that went into the build shows, especially in the LEGO parts. We think Han Solo would indeed be proud! If you’re ready to go even further with Star Wars and LEGO, you might want to check out this barrel organ that plays the Star Wars theme.

And So Castings Made of (Kinetic) Sand . . . Turn Out Pretty Well, Actually

sand castingThat kinetic sand stuff is pretty cool. It’s soft, it builds motor skills, and outside of sprinkling it on carpet, it’s not messy. If you don’t know, it’s 98% sand and 2% polydimethylsiloxane, which is a major component of Silly Putty, and according to a certain yellow and red clown, it’s safe enough to put in chicken nuggets. [Chris]‘s wife bought him some, probably because she wanted to see him play around with something that isn’t potentially deadly for a change. In the course of researching its magical properties, he found out that it doesn’t really have a thermal breakdown point, per se. At high enough temperatures, It vitrifies like a sand castle in a mushroom cloud. Between this property and its malleability, [Chris] thought he’d have a reasonable substitute for founding sand. As you can see in his latest experiment, he was right. As a bonus, he managed to turn the benign into the dangerous.

[Chris] had never cast aluminium before, so he decided to start small by making an offset cam for a rotary broach. He packed some magic sand in a wax paper cup and shoved the cam in to make the negative. Then he cut down some aluminium rod and put it in a graphite crucible. He stuck his DC arc welder’s electrode down into the crucible and cranked it up to 50A. That wasn’t enough, so he went to 110. The crucible was soon glowing orange. He carefully poured the molten aluminium into the mold. Make the jump to see how it panned out.

Spoiler alert: there’s no cussin’ this time!

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Lego Technic Mechanical Seven Segment Display

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Here’s a rather mesmerizing piece of Lego genius, displayed as a .GIF for your enjoyment. It’s a 7-segment display that is completely mechanical!

Built by [aeh5040], this beauty features 7 separate linkages that control each display segment. It’s powered off of a single motor which rotates a cylinder covered in small protrusions, similar to how music boxes work. As the cylinder rotates, the protrusions knock the main drive gears back and forth, flipping each segment between the ON and OFF states through a series of axle joints and bevel gears.

It makes rather satisfying sounds too!

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Self-Balancing Robot Uses Android and Lego NXT

LEGO NXT + Android = Self Balancing Robot

Self-balancing robots are pretty cool, but sometimes a bit too complex to make. [HippoDevices] shows us that it’s really not that hard, and you can even do it with Lego NXT and an Android device!

First step is to build your two-wheeled robot – go nuts! As long as the Lego NXT motors are strong enough you’ll be able to make most different shaped robots easy to balance. You’re going to need an Android ADK board to provide communication between the Lego motors and your Android device. [HippoDevices] is using their own design, called the Hippo-ADK which is on Kickstarter currently.

This allows your Android device to read the status and control the Lego Motors — from there it’s just a matter of programming it to balance according to the device’s gyroscope.

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Raspberry Pi Turns a Novelty Radio Into a Real Computer

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[Strider19] remembers the 90’s, and a great little novelty radio he had back then. Shaped like a computer, the radio was a typical AM/FM affair, with the monitor serving as a speaker. His original radio was long gone, but [Strider19] was able to find a replacement on everyone’s favorite auction site. With the replacement radio in hand, he set his plan in motion: Turning it into an epic Raspberry Pi Case.

The Raspberry Pi fit great, but [Strider19's] 3.5″ composite monitor didn’t quite make it. Following in [Ben Heck's] footsteps, [Strider19] cut the LCD’s control PCB down to fit the case. A piece of clear polycarbonate protects the fragile LCD from poking fingers. The monitor’s button board, two USB ports, and an external composite input mounted nicely inside the former battery compartment at the rear of the CRT. There’s even enough room back there to hide a USB WiFi adapter.

The Raspi itself fit perfectly into the base of the radio, along with a DC to DC converter, USB hub, real-time clock module, and a whole bunch of wires used to extend the connectors.

The final result is awesome! Thanks to a request on [Strider19's] Reddit thread, we have pictures of Doom running on a (former) radio.  Even Windows 3.1 runs under DosBox, though it took a bit of tweaking to get the display settings just right. Now [Strider19] just needs to figure out how to turn that tiny keyboard into a working model. We think some old school cell phone keyboard hacking may be in order!

 

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