Feeds

LOHAN cops a faceful of Raspberry Pi

Vulture 2 spaceplane's Picam captures fetching rear-end selfie

  • alert
  • submit to reddit

Application security programs and practises

The Low Orbit Helium Assisted Navigator (LOHAN) team is methodically working its way through the installation of the Vulture 2 spaceplane's electronic systems, and having got the Pixhawk autopilot up and running, we were able to turn our attention this week to the onboard Raspberry Pi.

LOHAN regulars will know that we use a Model A Pi rig for tracking and high-altitude imaging, the latter via the diminutive Picam.

A close-up of the Picam

With somewhat more than a tad of trepidation, the first step in the Pi installation was to mount the Picam in underside of the aircraft's nose, behind the 3D Robotics digital airspeed sensor probe:

The airspeed indicator probe and the Picam lens protruding from the Vulture 2

In contrast to other components, which are fixed to enable removal/replacement if required, the Picam is epoxied into place. The reason for this is that we really don't want any supersonic airflow entering the Vulture 2's beak, so a proper seal is in order.

Here's the Picam board inside the nose, with the airspeed sensor board at right:

The Picam board and airspeed indicator board seen inside the Vulture 2 nose

Of course, if there's a problem with the Picam, we've got a right faff on our hands to get it out again, so it was expedient to mount the Pi board, connect the camera and check all was well before proceeding with other tasks.

The Pi sits above the canard servos atop some anti-slip mat and screwed into the wooden servo mounting blocks. Rubber washers provide additional damping, and here's a fetching view with the canards in place to check clearance of the control rods. The black and red wires emerging underneath the GPIO pins are for eventual connection of the Pi rig to its battery supply (more on that in a bit):

The Pi mounted in the Vulture 2 nose

One important step before placing the Pi was to grab a pIO microSD card adaptor:

The pIO microSD card adaptor

This solves a serious vulnerability issue. The standard adaptor sticks out from the board, exposing it to the risk of getting knocked or vibrated loose. The pIO positions the card right under the Pi, with a rock-solid connection:

The pIO microSD card adaptor slotted into the Pi

So, with that sorted, the fun and games could begin. Since this is a new Pi, it fell to me to get it up and running, and I'm ashamed to admit that what I know about such things can be written on the back of an extremely small slice of punched tape.

Nonetheless, it's said that 12-year-olds worldwide are wrangling Pis with ease, and in the absence of a handy 12-year-old to do the job for me, I downed a couple of stiff brandies and got to it.

Here's the whole thing hooked up using the highly recommended PiHub:

The Vulture 2 and Pi set-up on the workbench

Note that I had to unscrew the Pi to connect the power cable to the end of the board facing the aircraft's nose. That won't be an issue once the Pi's running off the aforementioned battery supply.

I rather noobily got an SD card preloaded with a selection of OSes, and installed Raspbian - Pi guru Dave Akerman's system of choice.

To cut a short story even shorter, with that triumphantly running with the aid of the quick-start guide (prompting a celebratory brandy), I enabled the Picam, logged in and typed raspistill -o image.jpg.

This is a basic image-grabbing command which displays a five-second video preview and snaps the last frame. Splendidly, the result showed the Picam to be fully functional, and capable of delivering a Instagram-worthy shapely Vulture 2 rear-end selfie:

The Vulture 2 rear fuselage and tail, as taken by the Picam

Good news indeed, so we're now set up for camera tweaking and Dave Akerman's in-flight code which automatically records Picam stills and/or video at predetermined altitudes.

That's not the end of the Pi installation story, though. For airborne operations, the rig also has an accelerometer, GPS, Radiometrix transmitter and power supply regulator, as seen here prior to packing into our ill-fated Covert High Altitude Vehicle (CHAV):

The CHAV aircraft and the Raspberry Pi rig before assembly

The ever-busy Dave and fellow LOHAN team member Anthony Stirk are putting together a dedicated board for these bits, which will sit on top of the Pi and connect via the GPIO. This will tidy the whole thing up, and requires just the two power cables mentioned above.

With the juice hooked up to a rack of AA Energizer Ultimate Lithiums, we'll be good to go. You'll see just where the batteries go when we bring you another exciting update on the final installation of the autopilot and its peripherals. Keep watching the skies...®


More from the lovely LOHAN:

  • You can find full LOHAN coverage right here.
  • If you're new to LOHAN, seek out our mission summary for enlightenment.
  • There are photos our our magnificent Vulture 2 spaceplane here, and detailed structural plans here.
  • For your further viewing pleasure, we have all our photographic material stored on Flickr.
  • Our LOHAN and Paper Aircraft Released Into Space (PARIS) videos live on YouTube.
  • We sometimes indulge in light consensual tweeting, as you can see here.

LOHAN - A Special Projects Bureau production in association with...

  • 3T RPD logo
  • University of Southampton logo
  • Applied Vacuum Engineering logo
  • Escher Technologies
  • Flashpoint Fireworks logo
  • HAB Supplies logo
  • Rock 7 logo
  • Random Engineering logo
  • Space Graphic Solutions logo
  • 3D Robotics logo

Paper Aircraft Released Into Space

Build a business case: developing custom apps

More from The Register

next story
Asteroid's DINO KILLING SPREE just bad luck – boffins
Sauricide WASN'T inevitable, reckon scientists
BEST BATTERY EVER: All lithium, all the time, plus a dash of carbon nano-stuff
We have found the Holy Grail (of batteries) - boffins
The Sun took a day off last week and made NO sunspots
Someone needs to get that lazy star cooking again before things get cold around here
Boffins discuss AI space program at hush-hush IARPA confab
IBM, MIT, plenty of others invited to fill Uncle Sam's spy toolchest, but where's Google?
Famous 'Dish' radio telescope to be emptied in budget crisis: CSIRO
Radio astronomy suffering to protect Square Kilometre Array
Bad back? Show some spine and stop popping paracetamol
Study finds common pain-killer doesn't reduce pain or shorten recovery
Forty-five years ago: FOOTPRINTS FOUND ON MOON
NASA won't be back any time soon, sadly
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Securing Web Applications Made Simple and Scalable
Learn how automated security testing can provide a simple and scalable way to protect your web applications.