Dear community,
I've assembled a GoTo/Tracking for my dobsonian using Arduino and LX200 protocol using bluetooth to connect in SkySafari. I'm using the observation list catalogue of LX200 to align the mount and use the GoTo. For a short goTo it works well, but pointing to another side of the sky sometimes it loses the precision. Looking for the LX200 protocol I could check that it has support for 2 and 3 stars alignments. Checking the SkySafari 6 manual, it looks the support for 2 stars alignment for altAz mount is available only for pushTo mounts.
This is what I found in LX200 protocol files:
Alignment commands
Align, polar alignment mode :AP# Reply: [none]
Align, one-star*4 :A1# Reply: 0 or 1#
Align, two-star*4 :A2# Reply: 0 or 1#
Align, three-star*4 :A3# Reply: 0 or 1#
Align, accept*4 :A+# Reply: 0 or 1#
4 = The one star alignment is implemented to correct RA/Dec offset. Two star alignment adds a second star to measure/correct for polar axis Altitude misalignment. Three star alignment adds a third star to measure/correct for polar axis Azimuth misalignment. These are saved when Set park is called and maintained when Parking/Unparking the mount. The sync. equatorial coordinates command refines the model for a local area of the sky, this refinement is lost when the power is cycled unless another Set park is called. The intended use of these commands is as follows...
Call A1. {or A2/A3.}
Set RA/Dec target (near the Zenith, telescope east of the mount, for minimal offset in RA due to polar Azm misalignment).
Slew to target.
Use move commands to center target.
Call A+. (records offsets, corrects RA/Dec)
Continue for 2 or 3 star:
Set RA/Dec target (near the Zenith, telescope west of the mount, for minimal offset in RA due to polar Azm misalignment).
Slew to target.
Use move commands to center target.
Call A+. (records offset, corrects error in polar altitude)
Continue for 3 star:
Set RA/Dec target (near pole altitude in southern sky, for maximum offset in RA due to polar azimuth misalignment).
Slew to target.
Use move commands to center target.
Call A+. (records offset, corrects error in polar azimuth)
My question is if I proceed 3 star alignment will I get the result for 3 stars alignment, or if am I only overwriting the 1 star alignment?
Any help will be appreciated