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LOHAN serves up Raspberry Pi sensorgasmotry

Inside our spaceplane mission's fruity electronics

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Taking snaps 19 miles above Earth

We had two of these lightweight gadgets for the mission - one in the CHAV and another in the main payload box - both acting as back-up trackers.

Anthony's PAVA tracker on the scales at 4.98g

Anthony brewed up the PAVA with a view to making a tracker "small enough and power efficient enough to be run from a single battery for enough time for a flight and possibly to reside in the neck of a balloon".

Cue an ATMega328P Microcontroller, Ublox MAX6 GPS and a HopeRF RFM22B radio module and you've got a tracker small enough to insert into the CHAV's fuselage through a small aperture:

Anthony installs the PAVA tracker the in CHAV's fusleage

Both units performed impeccably during the flight, as did the PiCam:

Montage of flight images from the Raspberry Picam

Another montage at altitude from the Raspberry Picam

Montage of images from the Picam at around 100,000ft

Dave said of the mission: "For me the impressive thing was the camera and Pi kept working with outside temperatures down to -60°C with minimal insulation."

Indeed, and at the end of this vid of some of the flight footage, you can see the PiCam video grab from 2,000m to the tree near Perham Down on the edge of Salisbury Plain, where the flight ended:

Watch Video

All in all, then, a great success for the LOHAN electronics chaps. As a final bonus, Dave provided this "sensorgasmotry" from the Pi, representing around three minutes either side of the landing:

Graph showing data from the Raspberry Pi sensors

Dave explained: "The green line is the air pressure. This increases from 820mb at an altitude of around 1,800m to 1007mb at landing and is then constant.

"The purple jagged line going through it is the temperature, gently rising from 8°C to 21°C, and still getting warmer in the tree (which provided shelter from the wind).

"The three lower lines are accelerometer readings from the 3-axis magnetometer. The fact that the yellow line flips from negative to positive shows that the plane ended up inverted after the collision with the tree"

In case you're wondering, the negative to positive flip was because the Pi was mounted upside down in the CHAV, so the sensor correctly read this initial inversion.

The minimum recorded temperature was -47°C, although "it would have been colder, but sunlight heats the sensor", as Dave put it. The minimum pressure recorded was 5mb, though this is beyond the specification for the IMU. ®


Further LOHAN resources:

  • New to LOHAN? Try this mission summary for enlightenment.
  • You can find full LOHAN coverage right here.
  • Join the expert LOHAN debate down at Reg forums.
  • All the LOHAN and Paper Aircraft Released Into Space (PARIS) vids live on YouTube.
  • For our SPB photo archive, proceed directly to Flickr.
  • We sometimes indulge in light consensual tweeting, as you can see here.

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