Flight #39 - 2020a

Raspberry Pi camera

The 2020a flight will be tagging along with Mark Conner with NSTAR. Project: Traveler will be attaching a small payload to the bottom of Mark's flight string, and therefore no flight dynamics will be listed. The camera design is a variation on the Raspberry Pi cameras flown several years ago.

 

The camera uses a cheap Arducam 5MP sensor with a CS camera mount, and the lens is a 4mm fixed-focus lens. The total investment for the imagery is about $30 plus the Pi. To aide with the Pi, a real time clock was added to the I2C lines so that the time stamp is current on the Raspberry Pi generated photos despite not having an internet connection available at the launch site. I also added a piezo buzzer to the Pi so that it could provide some level of reassurance that it was booted and operating normally prior to launch.

To contain all of the Pi camera, I used a 3D printed enclosure made from PETG filament.

 

 

 

 

Flight Parameters

 

Launch Date/Time

Saturday July 11, 2020 at 9:00am (14:00Z)

 
Alternative Date n/a  
Launch Site Treynor, IA (41.23N, -95.60W)  

Capsule 1 (Track)

144.39MHz

Tracker: ptFlex with DRA818V 500mW transmitter signing W0ZC-11.

Sensor

Beaconing: Delay

  • Beacons every 45 seconds.
  • Path is disabled above 2,000m MSL.

Camera:  Raspberry Pi camera and controller.

0.7kg

 

   

 

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Flight Results

 

Launch Date/Time Saturday July 11, 2020 at 9:03am (14:03Z)
Launch Site Treynor, IA (41.23N, -95.60W)
Burst Altitude 30,422m (99,810')
Average Ascent Rate 4.35m/s (856'/min) 
Measured Descent Rate 5.96m/s (1,173'/min) 
Touchdown Site 40.73N, -94.67W
Touchdown Time Saturday July 11, 2020 at 11:16am (16:15Z) 
Recovery Time Saturday July 11, 2020 at 12:13pm (17:13Z) 
Distance Traveled 97.5km (60.5mi)
Total Flight Time 2:24 
Downloads Flight Path (KML), Analysis Spreadsheet, Winds Aloft Forecast, W0ZC-11 Log 

 

The ptFlex tracking system worked flawlessly throughout the flight. I did include a modification to the firmware to track the current memory consumption to look for anomalies or memory leaks, however none were detected. 

The new camera module with the Raspberry Pi worked quite well throughout the flight. I was impressed with the overall quality of the photos as compared with the older Canon 130IS  camera I have been using. A lot of good data was accumulated with the camera by modifying the camera capture settings and taking a lot of photos.

The biggest problem with the camera is that the chromatic lens aberrations were quite noticeable as the flight ascended. The center of the photo frame had a lot of color saturation, and then it dropped off rapidly as the photo extended beyond the middle. I'm currently searching for an effective correction mechanism, but it would appear that the data is available and the photos can be largely salvaged.

The PETG-printed inclosure survived the flight, despite sitting in the hot summer sun for an hour after landing.

We did narrowly avoid a catestrophic failure by shear luck. The split-ring's that I've been using on my payloads for a decade now nearly failed between mark's capsules and my capsule that was on bottom. This particualr piece of load-line that I grabbed for this flight had unusually small split-rings on it. The flight was apparently quite turbulent and the split-ring separated to the point that upon recovery, I was able to pull the capsule free with a light tug.


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Photo Highlights

  

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Tracking Predictions

11 July 2020

Flight prediction for July 11, 2020.

 

10 July 2020

 

Predictions for July 10, 2020.

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