Wolfgang Birkfellner replied to the topic 'SkySafari doesn't slew to the correct target' in the forum. 2 weeks ago

hi!
yes, I know, but something like that COULD be a reason ... where does the telescope actually go to (in declination) when you enter a negative declination???
yours
wolfi

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Wolfgang Birkfellner replied to the topic 'SkySafari doesn't slew to the correct target' in the forum. 2 weeks ago

hi!
i don't know whether that is the problem, but i ran into something like that when programming my own controller (which also interacts with sky safari). sky safari sends strings as coordinates, like
-00:17:56# for mintakas declination
this is a string, a series of characters. on the program side, you have to convert this to a number for hour, minute and second. converting the first characters "-00" to a number results in the number 0 ... there is no negative zero, so this does make sense. and voila - the coordinates are wrong, it is now 0°17'56''. as this happens only below the celestial equator in your case, something like that might be your problem. however, porrima has a declination of -1° something, so it might not be exactly that problem, but it may be related...
just my guess...
yours
wolfi

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ok - three months later, v. 1.4 of the TSC-pcb hat is now fully working:
- realtime clock
- usb/serial converter for old school lx200
- optocoupler for relasing a DSLR
- input for temperature sensor
- freely configurable ST4 via the mini
- SPI control over the focuser board
wohoo

yours
wolfi

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Wolfgang Birkfellner replied to the topic 'INDI-ASI-CCD driver keeps crashing' in the forum. 1 month ago

hi!
had my 120MM running all night with the new 1.6 version of INDI on Raspian Stretch,; the camera was polling an image every second. No problems.
yours
wolfi

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Wolfgang Birkfellner replied to the topic 'Stellarium 0.17.0 now with INDI !' in the forum. 2 months ago

hi!
good news, especially since the old interface did not support syncing ...
happy holiday

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Stephane thanked Wolfgang Birkfellner in topic diy controller 2 months ago
Wolfgang Birkfellner replied to the topic 'diy controller' in the forum. 2 months ago

hi!
the next months will see a release of TSC, I am still working on the PCBs and i need some further testing of the autoguider function - github.com/selste/TwoStepperControl/wiki
stepper motor encoders are not yet supported, but it is no problem to add them. why do you need them? I drive a 350 kg telescope without encoders and GOTO works fine. TSC includes INDI for gudiecam-acquisition. control takes place via LX200. functionality includes:
- Internal editable catalogs and LX 200 support for kStars, CdC, stellarium and SkySafari
- Internal WLAN (opens it's own hotspot if no router is within reach
- LX200 via USB and WLAN
- ST4
- INDI interface to guidecameras and autoguiding
- DSLR control and dithering
- realtime clock
- support for two additional focuser drives
- Bluetooth handbox
yours
wolfi

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hi!
direct encoders are no issue as there are readymade phidget interfaces for those. however, I don't need them. as for encoders on the axes, something more sophisticated is necessary...
maybe an option for later :)
yours
wolfi

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... and everything has a revision - so this one has now optocouplers for DSLR and ST4 instead of the venerable ADuMs i used in the first effort, and to the left is a homebrewn auxiliary motor board that drives two steppers for motorfocusing. these are by far not as powerful as the Phidget boards (the drivers are cheap A4988 drivers, and the controller is an arduino pro mini), but for a focuser they are more than sufficient ...
yours
wolfi

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Wolfgang Birkfellner replied to the topic 'QHY5 - alccd5 mono distorted images' in the forum. 4 months ago

well, I think that is the easiest solution. my asi 12 MM works fine ...

yours
wolfi

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Wolfgang Birkfellner replied to the topic 'QHY5 - alccd5 mono distorted images' in the forum. 4 months ago

well ... i am afraid not really. without the cam and some code that can be modified, it is extremely hard to come up with something usable :/
yours
wolfi

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Wolfgang Birkfellner replied to the topic 'Trouble installing INDI on Raspian Stretch' in the forum. 4 months ago

Hi!
There are many Jessies still around I assume. However, software packages with Jessie get dated by now, and above all, it is the distro that comes with NOOBS. So everyone who is buying a Raspi now most likely will have Stretch.
Yours wolfi

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Wolfgang Birkfellner replied to the topic 'Trouble installing INDI on Raspian Stretch' in the forum. 4 months ago

Hi!
No, I am trying to install the Raspberry Pi dedicated INDI version on the latest Raspian version (stretch) according to the recommended procedure :)

Mate is no alternative as I am really dependent on I2C, WirinPi, SPI and so on for my controller project.
Yours
Wolfi

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Wolfgang Birkfellner replied to the topic 'Trouble installing INDI on Raspian Stretch' in the forum. 4 months ago

has really no one yet installed INDI 1.5 on the new Raspian????

yours
wolfi

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Wolfgang Birkfellner created a new topic ' Trouble installing INDI on Raspian Stretch' in the forum. 4 months ago

hi!
Trying to migrate my controller project to Debian Stretch - however, when following the instructions, I end up with
"E: Package 'libcfitsio3-dev' has no installation candidate" while trying to install the prerequisites ...

apt offers me to install "libcfitsio-dev", but then the installation routine for the indi 1.5 debian packages fails ... any ideas?
yours
wolfi

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... a few months of reduced activity. but now, here is the TSC HAT ... it does not feature the motor drivers but a temperature compensated clock, galvanic decoupled ST4 + 3.3V conversion, DSLR control and a USB/RS232 interface ... not being an electricla engineer, i still like my three pcbs (the right one is an alternative to the phidgets in future, an SPI controlled arduino mini with 2 RAPS 128 controllers), and the bluetooth handbox is also ready. fritzing and eagle schematics are on the github link :)
yours
wolfi

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Wolfgang Birkfellner replied to the topic 'Rpi DIY mount stepper control upgrade?' in the forum. 7 months ago

Hi! No personal experience, just hearsay from an experienced friend:
- unhardened, stainless steel
- bearings should be massive from my gut feeling :)
Yours wolfi

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Wolfgang Birkfellner replied to the topic 'Rpi DIY mount stepper control upgrade?' in the forum. 7 months ago

hi!
well, I learned a lot in the past 9 months, especially as this stepper controller stuff popped up in my academic work when working with a lung dosimetry phantom (i am a medical physicist), and TSC became the spin-off of that stuff. so yes, there is of course more than the first order approximation (heat vs. motion) as we do not have 100% efficacy. However, in my application it is solved by disabling the drive (this is a software command for the phidgets or a logical i/o for the drv 8815) when it is not needed. the current regulation thing sounds attractive at first sight, but my experience is that the correct current is the one where the stepper operates smooth under load without loosing steps. i never saw a reason (heating or insufficient precision at higher speeds) to tinker with current byond that. too muc current simply causes rough operation and overheating. so far for the constant output transformer - it has it's sweet spot for the load and voltage given ...

friction drives - i know a few ones here in Austria - funny enough we have quite a number of rather big fork mounted ATM instruments here, the reason might be a detailed plan that is circulating for the past 30 - 40 years called the "Austrian Precision Mount" which was designed by the head technician of Vienna University Observatory, Mr. Pressberger. Having built a fork mounted 60" RC himself, quite a number of people have made instruments in the 35-70 cm aperture range following his concepts. my houghton is one of the smaller instruments, but it is very heavy because of its front mounted corrector. my friend richard gierlinger has driven a 70 cm telescope with a friction drive - he says they are easy to control, but the roller and disk have to be made of stainless steel, and they must not be hardened. that's it, more, or less ....
yours
wolfi

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