Below is the 'short' version with little reference to other devices
Its a device that needs some detail to setup correctly unfortunately.
You can ignore the Polar Alignment component if you want but some of it is relevant
The rest is pretty important to know I think
Astrotrac 36O Documentation short version Equipment usedAstrotrac mountLatest Astrotrac FirmwareStellarmate/RPI 4 with 8gb OptionalRTCExternal USB dongle Order of connection Notes
Polar Alignment screens tested in simulation in these pictures , works perfectly in Actual imaging
Various Tabs related to Astrotrac mount in the INDI control panel
Kstars chart and mount control
Setting up location and behaviour for updating across devices
Initial network setup
Astrotrac 36O Documentation Equipment usedRasberry PI (RPI) 4b 8gb with Stellarmate OS + RTC module + Brostrend Ac650 High Gain USB Wifi Dongle + Sandisk 128gb USB 3 SSD (as OS drive and storage)Pegasus Pocket Power Box Advanced (PPBA) with environmental sensorQHY 168 C cameraZWO EAF 12v focuserLatest driver for Astrotrac (sameer has a link) Order of connection Notes
Will upload my experience soon. Its been super busy at work :<
I think it is finished I think it is part of the ‘stable’ release, everything works perfectly as far as Sameer and I have used. Jasem put much work into it and ironed out all issues we could find.
Do use it and tell us if any issues, Sameer and I will be writing documentation, Sameer has done a good chunk I will complete and add this weekend.
Hopefully it works ok too for you!
It appears after some testing with Jasem that the RA values during slewing are changing rapidly from say 2hr to 14hr.
It appears there is jitter in the dec encoder which is changing the sign from + to -ve randomly and that affects the calculation for the coordinates.
We tried an updated driver that accounts for the jitter but it continued to show similar behaviour in my indoor testing today.
Out of curiosity instead of leaving the Dec access at home position I changed it to + or - 1 or something more or less than 0. I did similar for the RA access. In that mode all the SLEWs showed correct Ra values as you would expect at say x800 speed. I also tried the polar alignment module with these slight offsets to the starting position and it worked consistently every time (indoors under simulation) did not matter if I was slewing east or west or the speed of the mount.
I removed the offset and began in the home position with encoders at 0.00 inn both axises and polar alignment would fail sometimes. It failed precisely at the time the RA values jumped around probably related to the dec jitter and the message mount aborted changed speed came up. I the checked again with my little offset and again it worked again consistently.
Might help some of you whilst it can be figured out, I cannot test outdoors I haven't seen the clear sky in 3 months.
Jasem is working on it.
I thought plate solving was working, for me, but when I was using the polar alignment routine, after the first of 3 images used in the process, the mount slews to the next area based on target rotation (30 degrees to the west as set in the alignment panel) however it seems to continue slewing beyond 30 degrees and wont stop and I had to unplug the mount to get it to stop. Restart everything works ok until I try the alignment again. I didn’t check whether the plate-solve showed correct coordinates but I did note that the polar alignment error was huge despite being roughly aligned. I wonder if it was not correctly registering the solve. But that wouldn’t explain why it was slewing essentially non stop.
Anyone else have the problem