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INDI Library v1.7.9 Released (23 Jun 2019)

INDI Library v1.7.9 is mostly a maintenance release to fix a few bugs in several drivers.

Internal Guider not calibrating

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Replied by pauledd on topic Internal Guider not calibrating

HelgeMK wrote: Hm..does it mean that the BT connection is not good enough to support guiding?

My personal experience was that BT is even more unreliable than Wifi connections but it could also be just delusion :side:
--= human, without Windows™ =--
pls excuse my bad english! :)
1 year 1 month ago #26155

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Replied by Ihoujin on topic Internal Guider not calibrating

It's true. There is a noticeable delay with BT over USB with serial TTL adapter.
INDI/KStars on Raspberry Pi 3B+
Lubuntu 16.04
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
1 year 1 month ago #26156

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Replied by petarm on topic Internal Guider not calibrating

Hi all i noticed exactly the same thing over the weekend. Bluetooth works great inside my house with just the mount connected. Once i attached bluetooth moonlite focuser it starts to play up. Add guiding to the mix and forget about it, it falls over within a minute. It seems like there is just way too much data being transfered and bluetooth is just not up to the task. After changing to eqmod USB cabled connection the thing ran all night, no issues with pulse guiding (no ST4 cable) with a ASI 120MC and 2x2 binning and SER algorithm (looks to me that it is better than the smart algorithm, i don't know why, just an observation after using both).

One thing i did notice was internal guider worked flawlessly on my first target. After aligning on my second target and clicking on guide, the internal guider did not guide properly. I had to restart the computer to get the guider to recalibrate for successful guiding.

Is there is a way to just reset the internal guider calibration and have it recalibrate on a new star without having to restart everything?

regards
Lots of trial and error, mainly error, but in hindsight, it was easy!!!
Takahashi FC100DF, Skywatcher HEQ5 Pro via Wifi, QHY-163C, Baader mod Canon 550D, ZWO ASI 224MC on Orion 50mm guide scope, VNC to Asus Tinker Board or Intel Compute Stick in hot spot mode running Ubuntu 18.04LTS and KStars/Ekos...
Last edit: 1 year 1 month ago by petarm. Reason: additonal information
1 year 1 month ago #26162

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Replied by Ihoujin on topic Internal Guider not calibrating

To clear the calibration data, click the trashcan next to the Guide button.
INDI/KStars on Raspberry Pi 3B+
Lubuntu 16.04
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
The following user(s) said Thank You: knro
Last edit: 1 year 1 month ago by Ihoujin.
1 year 1 month ago #26163
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Replied by petarm on topic Internal Guider not calibrating

I should use my glasses, I didn't even see the button, cool thank you
Lots of trial and error, mainly error, but in hindsight, it was easy!!!
Takahashi FC100DF, Skywatcher HEQ5 Pro via Wifi, QHY-163C, Baader mod Canon 550D, ZWO ASI 224MC on Orion 50mm guide scope, VNC to Asus Tinker Board or Intel Compute Stick in hot spot mode running Ubuntu 18.04LTS and KStars/Ekos...
1 year 1 month ago #26165

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Replied by HelgeMK on topic Internal Guider not calibrating

Really appreciate all the responses! On next occasion I will compare, BT vs USB - still I wonder why BT from a technical perspective would not be good enough, is it really that much data?

Anyway, wanted to ask this:

What guide rate is recommendable? By default I was using 0.5, now I read that 1.0 would be preferred - for phd2.

Then: What minimum pulse rate do people use? With a 500mm scope (thru oag), and asi120, would 1000ms or even more would make sense?

Lastly, to which extent would autostretch have an effect on the guiding? Apart from increasing visibility of stars to the user?

Many thanks as always! Helge
1 year 1 month ago #26190

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Replied by jpaana on topic Internal Guider not calibrating

I use HEQ5 Pro with EQDIR-BT dongle with PHD2 and have recently made some changes to EQMod driver for this purpose. The original code didn't take into account communication delay with the mount which is around 50ms per command when using BT and around 16ms when using EQDIR cable and 32ms when using PC Direct mode via the hand controller. This made each pulse essentially that much longer. Also the code used timer for all pulse lengths which made short pulses quite unreliable. Last issue was that if mount status query timer happened to hit during the pulse duration, the pulse got significantly longer as command to end the pulse got delayed. These issues should be remedied by current EQMod driver version from nightly which added configuration items to ignore very short pulses and configurable limit how long pulses are handled synchronously. The value for minimum pulse should be around the communication delay so 50 ms for BT, less for wired connection, the default value of 10 ms is very conservative. Default value for timer threshold (100 ms) is probably good as is, but I've used slightly longer 150 ms as the limit myself.

As for the guide rate I've settled on 0.5x after testing 0.3x, 0.75x and 1x, it seems to be a good compromise between correction speed and not over correcting. I'm not sure what you mean by minimum pulse rate, I use 3s exposures so PHD2 does corrections only every 3s to average out effects of seeing. Sometimes I use 2s or even 1s, but 3s has proved to be good compromise.
Remote observatory running Ubuntu 19.04 x64 with ScopeDome 2M, Skywatcher EQ8 and HEQ5, TS 8" RC, Atik 383L+, ASI178MC, ASI120MM-S, SX Lodestar X2, SX USB wheel with OAG, USB_Focus V3, Gemini SnapCap, USB_DewPoint, KomaHub
The following user(s) said Thank You: knro, geehalel, petarm, HelgeMK, TomAstro
1 year 1 month ago #26191

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Replied by knro on topic Internal Guider not calibrating

I tested with Jarno's changes yesterday and everything worked fine. Of course, I didn't have issues before (using EQDir cable, so latency wasn't much of an issue), but the results are great nonetheless!

Jasem Mutlaq
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1 year 1 month ago #26193
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Replied by HelgeMK on topic Internal Guider not calibrating

Dear Jarno,

I was fascinated reading about the enhancements you made. Great job!!!

I erroneously wrote minimum pulse rate, should just have been minimum pulse (length).

Best, Helge
1 year 1 month ago #26196

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Replied by petarm on topic Internal Guider not calibrating

Cool, so if there is a fix for BT latency issues and its in GIT (i assume for more testing), how soon will EQMod update be in the stable release?
Lots of trial and error, mainly error, but in hindsight, it was easy!!!
Takahashi FC100DF, Skywatcher HEQ5 Pro via Wifi, QHY-163C, Baader mod Canon 550D, ZWO ASI 224MC on Orion 50mm guide scope, VNC to Asus Tinker Board or Intel Compute Stick in hot spot mode running Ubuntu 18.04LTS and KStars/Ekos...
1 year 1 month ago #26198

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Replied by TomAstro on topic Internal Guider not calibrating

Is this means that the Ekos & PHD2 dithering issue is solved?
1 year 1 month ago #26201

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Replied by jpaana on topic Internal Guider not calibrating

Unfortunately this doesn't have any direct impact on dithering with PHD2 as such, only that the dither pulses would be more accurate than before. For me dithering seems to usually work, though at times Ekos doesn't seem to register settling signal after dither, but resumes after timeout anyway. More rarely PHD2 doesn't seem to receive the dither command from Ekos at all so there seems to be some fragility with the communication between the two.
Remote observatory running Ubuntu 19.04 x64 with ScopeDome 2M, Skywatcher EQ8 and HEQ5, TS 8" RC, Atik 383L+, ASI178MC, ASI120MM-S, SX Lodestar X2, SX USB wheel with OAG, USB_Focus V3, Gemini SnapCap, USB_DewPoint, KomaHub
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1 year 1 month ago #26213

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