The Astro Raspberry Pi Camera System 4
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Transcript of The Astro Raspberry Pi Camera System 4
Rob Pettengill - TSP 2015
The Astro Raspberry Pi Camera System 4Rob Pettengill ([email protected]) Rob Pettengill Rob Pettengill Texas Star Party Texas Star Party 16 May 2015
1Pie image from http://www.flickr.com/photos/rexroof/3802694376/
Creative Commons Attribution 3.0 Unported
Rob Pettengill - TSP 2015
AGENDA• Why Build Your Own Why Build Your Own
Camera?
• How I Built Mine
• What I Learned
• What ’s Next?
• Build Your Camera Not Mine
Christos Vasilas of Dash One
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1st afocal RPi Cam astro images
Rob Pettengill - TSP 2015
Internet Of Things And Astronomy
• Remote Observing downsized & updated.
• GoTo telescope control
• PushTo instrumentation and link to planetarium software
• Automatic focusing.
• Guiding
• Camera control and enhancement.
• Plate solving.
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http://vaticanobservatory.org
http://simonbox.info/index.php/astronomy
http://www.recantha.co.uk/blog/?p=3615
http://astrobeano.blogspot.com/2014/01/instrumented-telescope-with-raspberry.html
Rob Pettengill - AASRob Pettengill - AAS 4http://www.raspberrypi.org
http://beagleboard.org/Products/BeagleBone+Black
http://www.intel.com/content/www/us/en/do-it-yourself/edison.html
Rob Pettengill - AAS
W h a t Wa s I m p o r t a n t To M e ?
I wanted to combine my interests in small electronics & Astronomy in a project.
• Saw potential in credit card sized computers.
• Replace the laptop with a small low power wireless computer. ARM based IOT computers are powerful yet small and low power.
• Replace the laptop display with a wirelessly connected cell phone or iPad. Better displays than many laptops and far better than camera displays.
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Terry Belia Terry Belia astrotex.com
Rob Pettengill - AAS
Why Build Your Own Camera?• Sensor
• Customize to your scope and target
• Functions
• Enhanced Focusing
• Region of Interest Crop
• Packaging
• Size & Weight
• Cooling
• Cost
• Fun
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Rob Pettengill - TSP 2015
R P i + C a m e r a M o d u l e + Q u e s t a r C a m e r a A d a p t e r
C a n I t Wo r k ?
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https://www.flickr.com/photos/robpettengill/sets/72157635483690850/
Rob Pettengill - TSP 2015
Screw Me Up TightAstro RPi 3.0 Uses a T-ring as a nut to bolt mounting plate for camera to the Uses a T-ring as a nut to bolt mounting plate for extension tubes
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Rob Pettengill - TSP 2015
A System PlatformAstro RPi 4.0 Uses simple metal cage for sensor board with a T-ring as a nut to Uses simple metal cage for sensor board with a T-ring as a nut to bolt Uses simple metal cage for sensor board with a T-ring as a nut to
mounting plate to the telescope adapter.
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Rob Pettengill - TSP 2015
Acquisition Software Stack
IOT based model - smart devices, using web based interfaces on the network, to talk to personal devices.
• On the Raspberry Pi
• Camera Interface (raspicam)
• Web Server - translate camera control from Web requests to raspicam, serve up images for aiming and focusing
• Image storage on local SD card
• Wireless ad hoc WiFi network for communication
• On a smartphone or tablet
• Web browser / Berrycam with camera control interface
• Last still image
• Streaming video
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Rob Pettengill - TSP 2015 15
72 image Astro Raspberry Pi Lunar Panorama made with Hugin
Rob Pettengill - TSP 2015Rob Pettengill - TSP 2015
Rob Pettengill - TSP 2015
Lessons Learned
• To ease switching from visual to sensor views, Prime focus sensor should be located as close to parfocal with the eyepiece as possible.
• Wireless connection speeds limit ease of aiming and focussing. Important features include:
• high speed wireless networks
• focus peaking
• region of interest cropping
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Rob Pettengill - TSP 2015
What's Next?
• Investigate larger sensors - Lack of Linux ARM drivers for high quality imaging chips is a barrier for now. A few already provide Intel Linux drivers and some ARM Linux (Point Grey).
• Improve ad hoc network speeds via faster wireless adapter or feathered operation.
• Add region of interest cropping to focussing mode and image capture mode.
• Add adjustable focus peaking display fo focussing mode.
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Rob Pettengill - TSP 2015
Quick Resolution Check
• Calculate angular pixel size
• Down-sample image to reference resolutions
• Up-sample reference images to original size
• Compare original to reference images
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