Oddly enough, on my RPi 4 I get slightly faster solving with astrometry.net offline than I do with ASTAP. All default settings, 40MB FITS file from my 183MM, just clicking "Load and Solve" from Ekos. I get around 15 seconds on average with ASTAP, 11 with astro.net.
For anyone reading this, the really stupid-simple way to get ASTAP installed is to point your PC's browser at stellarmate.local, go to the "Software" page on the resulting dashboard, and have it install ASTAP. Installs g17 for you too. Nice work there!
Of course your Pi has to be able to see the Internet to accomplish this.
Cross-posted this to the Pentax Forums astrophotography group.
Thanks. The focuser is going to be (I haven't built it yet) a relative one, just an INDI driver, interface board, and a stepper motor. I know where focus position is on the linear scale, so I can get it close and have a reasonable number for the autofocus limit of travel. But I have to run the focuser all the way in to store the scope, and I don't want to crash into the mechanical stops. Ideally I'd love to say "just go park it" with one button press and have it run inwards till it was just off the stop, of course, and say "run out to about focused in one go" too. I guess I can just use the INDI control panel for that, so long as I can figure out the correct numbers.
Is there a place to set the travel limits for a relative focuser in Ekos? I don't want the stepper to grind against the rack and pinion stops if focusing fails for some reason.
You know, I had assumed that an SSD would be faster, but flash is pretty much flash, isn't it? So long as it's a USB 3 thumb drive plugged into a USB 3 port on the Pi I should be good to go. Thanks, that saved me a few bucks, some cubic centimeters, and some grams on the scope!
The stepper HAT in question is the Waveshare, BTW.
Thanks Jasem! I'm not planning to boot off the SSD, I'll just use the MicroSD like everybody else. I'm just going to use it for storage, both for speed and so that I can transfer data merely by unplugging it and plugging it into the machine I use for processing.
Kevin on CN says that instead of the DockerPi board, he used a stepper-motor HAT, which also inputs 12V and runs the Pi off 5, but in addition of course it can run a stepper for autofocusing. So I'm probably going to do that instead, I built a myFocuserPro2 board but for some reason it won't drive the motor; having everything nicely integrated into the case with the Pi means fewer boxes and at least one fewer cable. May have to add a separate fan though.
Heh. I see a market opportunity for you here, Jasem -- the autofocus-capable StellarMate Advanced gadget.
I've got a Pi 3-based StellarMate gadget running my scope currently. Since Jasem and company seem to have gotten the early bugs ironed out of the Pi 4 version, I'm planning to upgrade. In particular, I'd love to have plate solving work reliably on the Pi side instead of having to use my Mac; along with the fuss/bother/limited Mac battery in the cold, downloading the images from the INDI server on the Pi to Ekos on the Mac takes almost a minute.
For general performance as well as never having to worry about disk space, I'm going to use a USB 3 SSD. External, so I don't have to add an interface board, as well as high-speed direct USB-3 transfer to other machines for processing. I'm using a DockerPi PowerBoard to give the Pi its 5V off my standard 12V barrel-connector wiring harness; that also lets me run 12V from the Pi case right to the ASI183MMPro's cooler (and to my someday autofocuser).
Pi 4b 4 GB, $55.00
DockerPi PowerBoard, $18.99
ADATA SD600Q 240GB USB 3.2 3D NAND External Solid State Drive - Newegg.com, $44.99
HighPi Raspberry Pi Case for Pi4, Black - PiShop.us, $9.95
Whaddya think? Any suggestions?
(Cross-posted to Cloudy Nights)
Thanks again all. For my particular rig, the 12V barrel connector and the fan make the DockerPi board ideal, so that's what I'm going with. Probably going with a HighPi case that has room for the hat, unless my friend prints me a case. Conceivably I might get a touchscreen and go with that, obviating WiFi problems most of the time, but then it would suck up more power and dollars.
I f I go with something like the DockerPi, I suspect I'll just ditch the powered hub altogether. It never worked for the mount or the USB GPS dongle on my Pi, so all I could ever plug into it was the camera and guide camera. Since I'm using a ZWO camera with two USB 2.0 ports on it now, I plug the filter wheel and the guide cam into those, then a USB 3 cable to the hub; that and the power cable to the Pi are all that's connected to it! Since the 4 has USB 3.0, it should work even better to plug the USB 3 cable straight into the Pi, along with the GPS and the mount, which can go in the 2.0 ports. Two fewer cables, one fewer box.
I was seriously considering sticking the Pi onto the telescope so that the only cables that have to move when the mount does will be the power to the Pi and to the TEC cooler on the camera. I suppose I could gin up something to connect the TEC to the 12V output on the DockerPi so that there would be only one.
The fan on the DockerPi doesn't produce enough vibration to worry about having on the scope, does it? I'd probably use Velcro anyway, which would provide a bit of cushioning.