Cockroach Pimps A Sweet Ride

This giant Madagascar hissing cockroach rides proudly atop his three-wheeled robotic platform. This project from several years ago is new to us and our reaction to the video after the break is mixed. We find ourselves creeped out, delighted, amazed, and saddened.

The cockroach controlled robot uses a trackball type input. A ping-pong ball is spun by a cockroach perched on top. The lucky or tortured (depending on how you look at it) little bug has an array of lights in front of it that illuminate when obstacles are in front of the robot. The roach’s natural aversion to light should make it move its legs away from that part of the display, thereby moving the robot away from the obstruction.

We’ve seen some bio-hacking in the past. There were robots that run off of rat brain cells and remote controlled beetles. But none of these projects make us want to get into this type of experimentation. How about you?

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Printed Circuit Board Minus The Printed Traces

Reader [Osgeld] is a board-layout ninja. He populated this 4×4 LED matrix board without having a layout plan to start with. Watch it develop in slideshow format to see the art work he performs. The display is driven by a shift-register and he’s included all the proper parts like resistors and transistors, yet he makes everything fit. Why is this amazing? He’s using uninsulated wire and not a single one of them crosses another wire. He’s physically designing a printed circuit board, routing the traces as he solders away. He’s built this to use with an Arduino shift register tutorial and our only question is where is the header to hook this board to a microcontroller?

Pressurized PVC Water Gun

Hackaday’s [Caleb Kraft] has branded today “kiddie d-day” after seeing this PVC water gun follow close on the heals of the LEGO sniper rifle. This is a great summer project if you don’t mind letting the kids use the quick connect on your air compressor. It’s really just a ‘T’ made of PVC with two valves for air and water management and a soda bottle on the third leg as a reservoir. In the short clip after the break you can see that you don’t get a lot of shooting time out of each charge compared to the DIY Super Soaker, but this build is also a lot less complicated.

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Seven-six-two Millimeter. Full Plastic Jacket.

Minifigs beware, something’s afoot. This LEGO sniper rifle is in talented hands to clean up those problem areas. [Jack Streat] put together this fascinating build as well as the delightful demo after the break. The bolt pulls a 1×4 block out of the eight-round magazine and loads it into the chamber. A pull of the trigger flings it with surprising accuracy. Want to be the coolest parent ever? Forgo the store-bought toys this year and put one of these together for your kid. Just don’t turn them into Private Pyle (NSFW).

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Dingoo A320 RAM Upgrade

[Stephanie] beefed up the hardware on her Dingoo A320. She enjoyed the features that the A320 handheld gaming system offered, but wanted the 64mb of RAM available in its bigger brother, the A330. A comparison of the two led her to believe a swap might be possible and after sourcing a pair of replacement chips for $12.50 she took the plunge. Once the solder had cooled it was just a matter of flashing some different firmware to take advantage of the upgrade.

[Thanks Juan via Dingoonity]

Making Liquid Nitrogen At Home

If you’ve got some time to scour eBay and $500 sitting around you can build your own liquid nitrogen plant. [Ben Krasnow] figured it all out for you and estimates he can produce a liter of the stuff for around $1.15. The process depends on a membrane to separate nitrogen from the other materials in the air around us and a cryocooler to get the gas cold enough to condense into a liquid. Other than atmospheric air, you need to pump in electricity. About 9.6 kWh per liter… yikes! Is your human hair solar panel up to that?

Anyway, once you’re up and running you can make yourself some ice cream or possibly save the world from oily destruction.

[Thanks Chris]