pauledd replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 2 weeks ago

Getting closer... There was no way for me to get the cap really good closed without that magnet trick. Because of my sloppy drilling for the caps main hinge there is a lot of slackness. I had to make some kind of "guide clip" for the magnet so that they really meet together at their middle. Those tiny magnets have a lot of force but only if they are really close and centered.

Now the cap closes quite good and the motor has enough force to devide the two magnets :)

www.youtube.com/watch?v=6l12JO2XDic&feature=youtu.be

After proper rewiring everything I hopefully can do some real tests outside when the scope is back on the mount.
I fear a little bit the flatfield cables might interfere other cables because of its 1kHz@100V power. No idea how this might influence the servo pwm. I also consider a complete rewiring because with the servo and the flatfield I have 5 new cables, one more step down converter and a low/high converter for the flatfields relay (because its active-low). Its getting really messy in my box
controlbox.jpg
I consider to etch a new pcb and put everything possible on it but only if outside test were successful.

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pauledd replied to the topic 'Solver fails consistently' in the forum. 2 weeks ago

gbeaton wrote: is 1.7x1.2 deg. but solver says 102x76 mins.

I never get exact results from calculators compared to solved images. However 1.7x1.2 deg and 102x76 mins is quite the same.

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pauledd replied to the topic 'Solver fails consistently' in the forum. 2 weeks ago

gbeaton wrote: I presume the solver is solving somewhere around where the mount is roughly pointing?

It should, depending on how roughly you did initial align the scope to north.

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pauledd replied to the topic 'Solver fails consistently' in the forum. 2 weeks ago

you could try to solve a captured image from the command line using "solve-field" maybe you get some errors. In ekos there is also an log field, dont you see any errors there?

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pauledd replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 3 weeks ago

The code change worked, I can now switch the flatfield in the ServoCap Tab on and off :).

Nice idea with that magnets and by sheer coincidence I left some on my fridge, I will try that.

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pauledd replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 3 weeks ago

I make some progress. The cap itself is finished so that the EL-Foil is now attached to it. It opens now fully thanks to the new stronger servo.
dustcover_flat1.jpg
I found out the new servo motor sucks about 0.1A maximum additional power from my system when its opened but I get
a little headache on how to get the cap really good (light/dust) sealed when its closed. I will try to use some very soft black
ring cutted foam.
dustcover_flat2.jpg

While trying to get the INDI WiringPi GPIO working for the EL-Foil relay I encountered a problem with the
INDI ServoBlaster Cap driver:

@Magnus_e
In the ServoBlaster Cap --> Calibrate Tab --> set flat light device Number I can only set a number from 0 to 9, but I would need WiringPi PIN 11 because I occupied allmost all other pins on my RPi2.
Can I simply change the line 124 in servoblaster_cap.cpp
from:

IUFillNumber(&LightSwitchN[0], "LIGHT_SWITCH", "set flat light device", "%6.2f", 0, 9, 1, 0);
to
IUFillNumber(&LightSwitchN[0], "LIGHT_SWITCH", "set flat light device", "%6.2f", 0, 11, 1, 0);
?

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pauledd replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 3 weeks ago

That sping is a good idea, nevertheless I had to exchange my payback coupons so I decided for a new servo.
Today I recieved the ds6020mg, normal sized an MONSTER power of This email address is being protected from spambots. You need JavaScript enabled to view it..

Another point for a new servo was the concern that the cap might not close completely
(in the meaning of an scope thats always outside in my telescope box, dust/pollen/wind).
I maybe want to put the first small servo on the opposite side of the cap to tighten the
cap somehow when the cap is in parked position because I doubt the sealing strength by
just one servo.

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pauledd replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 4 weeks ago

Thank you Magnus_e for your detailed ideas!

I am nearly 98% sure its a weight issue. The cap moves fully if the scope is slightly of the home-position so that the cap is not in its "heaviest position". I currently discuss my torque/weight calculations on a physic-board and its a little bit more complex than I thought.
Someone presented a formula to get the caps torque when its opened at 90° degree (the most heavy position):
torque_formula.png
Where
Mk: is the needed cap torque
m: is mass of the cap
g: Gravitational acceleration (9.81)
l: length of the cap (diameter)

With that formula he got about 13Ncm force needed to move the cap.
My motor has 46Ncm divided by 3.8cm of the servo arm that makes ~12Ncm.
I have no confirmation yet that its the right way to calculate it but it seems my motor
specs missed the caps torque very close. So I am quite shure replacing the acrylic cap
with 0.5 or 1 aluminium will do the trick. I will order two sheets of it, its quite cheap.

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pauledd replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 4 weeks ago

I made "some" progress with my dustcover. I decided to make parts of it made of wood because that was the easiest. In the course of this I realized that I was maybe wrong with the assumption that my littly tiny servo would have enough power.

I left the EL-Flatfield Foil away to just concentrate on the dustcover. The cover itself as baseplate for the foil was made of acrylic glas.
dustcover_mechanics.jpg

dustcover.jpg
Its weight is about 150g. Some tests showed I would need about 800g force to lift the arm. That approx. matched my calculations I did before:
hebelrechnung.jpg

However this does not work. I can unpark the cap but the servo never reaches the end position and stays making noise.
I tried to increase the servo voltage up to 6.7 Volts but it still doesn't reach the end position. I dont know whats wrong here because with that 3.8cm servo arm it should be able to handle up to 1.2Kg on that arm.

Before I consider to buy another stronger servo I'll try to replace the dustcover with an aluminium one, 0.5mm thickness, that should give a weight of about 20cmx20cmx0.05cmx2.6g= 52g and that should give a load on the servo of about 52x4.73= 245g, one third of my current weight.

Here's just a short video of my dustcover in action, looks good but doesn't reach end position and continuously makes noise.
www.youtube.com/watch?v=hOkfhTAwTZA&feature=youtu.be

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pauledd created a new topic ' Use Fitsviewer for Raw statistics (Canon,Nikon,...)' in the forum. 1 month ago

With Linux I found it very annoying to get reliable image statistics from images acquired during a kstars session (native image format).
Sometimes I want to review captured raw files for proper exposure but the current window that opens when a raw has been captured
does not reflect the true exposure, please correct me if I am wrong, it shows the (*.cr2) embedded thumbnails that is a jpg with nonlinear
representation of the light.
It would be very "cool" to have the native images also shown in the fitsviewer and also with detailed image statistics like mean/min/max/std.dev.
It is quite hard to get those statistics in linux via command line from a cr2 file (please enlighten me how you do that(without huge apps like PI)).
I currently use imagemagicks "identify -verbose" to do that to get a huge list of statistics and I have to do a:

identify -verbose MasterDivided.tiff | grep 'min\|max\|mean\|deviation\|Red\|Green\|Blue\|Overall\|Gray'
to get only whats interesting. Moreover that is terrible slow (50 seconds) for unknown reason(*).

(* see here: www.imagemagick.org/discourse-server/vie...123&p=146856#p146856 )

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pauledd replied to the topic 'APN image green' in the forum. 2 months ago

Maybe its the "Auto Debayer" or "3D Cube" Setting in the FITS Settings in the Kstars settings, try to disable them, maybe that helps.

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Magnus thanked pauledd in topic DIY Flatfield Dustcover with RPi 4 months ago
pauledd replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 4 months ago

Wow, that looks quite nice! I might consider 3d printing too if my aluminium cap idea fails but I dont own such a printer, and printing 4 ore more prototypes via online service might get very expensive...

I managed to get the ServoBlaster Cap work. Absolutly no errors during compilation! Servo moves as expected in indi :side:
It was indeed a faulty indi installation. Maybe I forgot to do "make install"... I will double check in future to prevent mass panic ;)

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pauledd thanked Magnus in topic DIY Flatfield Dustcover with RPi 4 months ago
pauledd replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 4 months ago

hi Magnus_e,

Thanks for your fast response, please dont try to do anything now! I think I found the error.
I think I have a faulty libindi installation... I will report back soon :)

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pauledd replied to the topic 'DIY Flatfield Dustcover with RPi' in the forum. 4 months ago

My first hardware arrived. As I unboxed my servo I was shocked about the size: it looks to small!
I realized that I ordered a mini-Servo :pinch:
servo_mini.jpg

It might be hard to attach an dustcap to this tiny thing but the specs say it can handle a lot of weight.
I'll simply use it to get some practising with servo motors and test it later with load attached.


I encounterd some problems following the indilib DIY page .
Firstly, the "contents" Box does not hyperlink any point after 4.
Installing ServoBlaster, no problem. Servo responds to move commands.

But for INDI ServoBlaster Cap (5.5) I get an error while trying to compile:

cmake -DCMAKE_INSTALL_PREFIX=/usr . ..
-- The CXX compiler identification is GNU 4.9.3
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1") 
-- Checking for module 'libindi'
--   Found libindi, version 1.1.0
-- Found INDI: /usr/include/libindi (found version "1.1.0") 
-- Found INDI-DRIVERS: /usr/local/lib/libindidriver.so
-- Configuring done
-- Generating done
-- Build files have been written to: /home/pi/build/indi_servoblaster_cap/build

 LANG=en sudo make install
Password: 
[ 33%] Building CXX object CMakeFiles/indi_servoblaster_cap.dir/servoblaster_cap/servoblaster_cap.cpp.o
In file included from /home/pi/build/indi_servoblaster_cap/servoblaster_cap/servoblaster_cap.cpp:24:0:
/home/pi/build/indi_servoblaster_cap/servoblaster_cap/servoblaster_cap.h:31:34: fatal error: indidustcapinterface.h: No such file or directory
 #include "indidustcapinterface.h"
                                  ^
compilation terminated.
make[2]: *** [CMakeFiles/indi_servoblaster_cap.dir/build.make:63: CMakeFiles/indi_servoblaster_cap.dir/servoblaster_cap/servoblaster_cap.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:68: CMakeFiles/indi_servoblaster_cap.dir/all] Error 2
make: *** [Makefile:128: all] Error 2
It seems it expects "indidustcapinterface.h" and "indilightboxinterface.h" in the "../servoblaster_cap" directory.
So I copied them from "indi/libindi/libs/indibase" to there.

Next I get a load of other errors:
[Warning: Spoiler!]

Maybe the author of the driver is here on board or maybe anyone can find what's the problem here? I would post an issue on github but for this repository I cant see any "Issues" page.

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pauledd created a new topic ' some thoughts that came up doing native captures...' in the forum. 4 months ago

I find it's a bit annoying when I capture NATIVE images (canons raw) they always pop up preview and occupy my whole screen. Even when I resize or close it, it returns to full size with the next exposure. It would be really nice if the preview window for the native captures would behave the same way like the fitsviewer that does it perfectly in my eyes. And an option to disable previewing right on the capture tab would be nice, didnt we already had this some time ago?

It would be also nice to have the preview of native images in the summary capture preview (if native format was selected).

Read More...

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