Hackaday Links: November 29, 2015

The Raspberry Pi Zero was announced this week, so you know what that means: someone is going to destroy a Game Boy Micro. If you’re interested in putting the Zero in a tiny handheld of your own design, here are the dimensions, courtesy of [Bert].

[Ahmed] – the kid with the clock – and his family are suing his school district and city for $15 Million. The family is also seeking written apologies from the city’s mayor and police chief.

There are a lot — a lot — of ‘intro to FPGA’ boards out there, and the huge variety is an example of how the ‘educational FPGA’ is a hard nut to crack. Here’s the latest one from a Kickstarter. It uses an ICE40, so an open source toolchain is available, and at only $50, it’s cheap enough to start digging around with LUTs and gates.

Over on Hackaday.io, [Joseph] is building a YAG laser. This laser will require a parabolic mirror with the YAG rod at the focus. There’s an interesting way to make one of these: cut out some acrylic and beat a copper pipe against a form. A little polish and nickel plating and you have a custom mirror for a laser.

You know those machines with wooden gears, tracks, and dozens of ball bearings? Cool, huh? Tiny magnetic balls exist, and the obvious extension to this line of thought is amazing.

[David Windestål] is awesome. Completely and totally awesome. Usually, he’s behind the controls of an RC plane or tricopter, but this time he’s behind a slo-mo camera, an RC heli, and a watermelon. That’s a 550-sized heli with carbon fiber blades spinning at 2500 RPM, shot at 1000 FPS.

How do you label your cables? Apparently, you can use a label printer with heat shrink tubing. Nothing else, even: just put heat shrink through a label maker.

Fubarino Contest: Hackaday On An RC Heli


[SF Tester] (his real name, honestly, with a brother who does QA for Blizzard) recently picked up a Blade SR remote control helicopter. Compared to the cheap coaxial helicopters you can pick up from eBay or Amazon for $30, this heli is a huge step up, but it does have one weakness – it comes with its own transmitter, and binding it to [Tester]’s shiny new DX9 transmitter is a pain.

The initial attempt at getting the proper values from the stock transmitter into his big-boy transmitter originally consisted of taking the stock transmitter, some servos, attaching them to homebrew protractors, and reading out the values of each axis manually. That’s a brute-force method of improving his new toy, so [Tester] sought out a better method.

The solution came via Arduino’s pulseIn() command. By connecting the stock receiver to an Arduino, [Tester] was able to precisely read the values coming from the stock transmitter and import them into his very fancy Spektrum DX9 transmitter.

Every Fubarino contest entry needs an easter egg, so when the value of the pulses coming from the stock transmitter is exactly 1337 microseconds, the Arduino spits out Hackaday’s URL to the serial console. Cleverly hidden, and a great way to improve an awesome heli. We can’t ask much more than that.

There’s no direct link for this, but you can literally see the code in the image after the break.

This is an entry in the Fubarino Contest for a chance at one of the 20 Fubarino SD boards which Microchip has put up as prizes!

Continue reading “Fubarino Contest: Hackaday On An RC Heli”