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Messages - pterodyne

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DIY AstroEQ / Re: Losmandy Titan stepper conversion
« on: August 07, 2018, 20:35:43 »
It's been a long time, but after several years of having a sitech servo 2 on the titan,(which started having problems), I decided to finish my titan conversion to astroeq.  Originally I was using onstep, but a little late night in observatory soldering fried my board.  Anyhow, I now have a Losmandy Titan with NEMA 23 1.5A motors running astroEQ.

See attached pictures. The overall pic still has the Sitech on it.  Nice to see AstroEQ can be used on a mount this size.  I have to limit my speeds to around 300x, but since it's all automated , that doesn't matter much. The stepper mounting brackets were designed using emachineshop.com CAD software and machined by them.  Perfect!


Losmandy Titan
270:1 Worm wheel
3:1 GT2 pulley reduction
Stepper Online NEMA 23 1.5A Bipolar steppers
AstroEQ with DRV8825 (fast decay hack)

AstroEQ Support / Re: latest firmware hunting at end of slews
« on: August 05, 2018, 00:00:26 »
I think I solved it.  I reset the eqmod settings and then I found this in the eqmod docs:

Max slew rate (introduced with V1.21e)
Provided the “Show Advanced Settings” option has been checked on the EQASCOM setup screen   the user now
has the option to limit the slew rate of Gotos and Parks/Unparks.
The way this works is that rather than telling the mount to goto a specific position, EQASCOM now just sets it
moving in the appropriate direction. It then monitors the mounts position until it has passed the desired target
position and then issues a normal goto.   Because the mount is close to the intended target the slew is
implemented at a slow rate by the mount.
Please note that there are potential control issues in operating in this way. Whilst the standard goto method will
always  stop when reaching the target position, this alternate method will only stop upon instruction by
EQASCOM. So if communications are lost it is possible that the mount will slew continuously. It is therefore not
advised to use this feature when operating the mount remotely.
This function was introduced at the request of those in extremely cold climates where the standard high speed
slews were becoming inaccurate

At any rate, (Pun intended), I think this was the behavior I was seeing.  The problem for me is every goto was way off.  Ill have to test it now and see if it not going past and then reslewing improves pointing accuracy.  The weird thing is, this has happened to me on different mounts and different computers (and even different builds of eqmod).  All ended up with plate solves taking quite a long time because the mount was several degrees off of the target. 

Ill post back after I test under the stars.

AstroEQ Support / Re: latest firmware hunting at end of slews
« on: August 04, 2018, 19:19:22 »
The comocom seems to be setup right, but serialecho shows neither my real astro eq port (15) or the comocom ports 20 and 21.

Ive tried run as administrator, compatability mode etc..

AstroEQ Support / Re: latest firmware hunting at end of slews
« on: August 04, 2018, 17:18:29 »
Latest from the website.  Here is a video of the action


AstroEQ Support / Re: latest firmware hunting at end of slews
« on: August 03, 2018, 07:02:56 »
, I just put the AstroEQ my Titan mount. I'm still having this problem. I would love to get it solved

Current specs
Drv8825 @ 32uStep
Gear changing disabled (needed or motors stall)
270 worm wheel
3 motor gear
1.8° nema 23 1.5A
Slew speeds 325

Thanks forr any advice :)

For any who are interested I have continued to develop this and am almost complete.  I have switched to Onstep as a controller, but the mechanics are identical, and If my astro eq were working well I would probably just use it since I prefer EQMOD.

Anyhow, here is the link:


AstroEQ Support / Re: TMC 2100 5V
« on: June 28, 2018, 15:09:38 »
They do not.  I guess it could be that these drivers are both dead. 

AstroEQ Support / Re: TMC 2100 5V
« on: June 27, 2018, 23:28:31 »
An in the interest of clarity, the one that brings it down to 3.2 volts does so whether or not the other non problematic 2100 is plugged in or not. Meaning one specific module bring down the voltage, the other one seems to be fine.  If that unit is in by itself, it still brings down the voltage, and that in either socket.

But back to my other post, with only one driver it seems to not function, even to the point of making eqmod become unstable.

AstroEQ Support / Re: TMC 2100 5V
« on: June 27, 2018, 23:19:20 »
So only one of the drivers brings down the voltage.  Im trying currently with only one driver installed and the voltage on the 5v bus is 5.15.

However when I try to do a goto slew in maxim DL I get the attached error.

Tracking turns on without incident, but no tracking, slews at different speeds in EQASCOM 2.0K don't error out but no movement.  If I keep messing with it, eqascom eventually seems to lock up.

AstroEQ Support / Re: TMC 2100 5V
« on: June 27, 2018, 16:18:11 »
Sorry, I just made an acronym out of Voltage Regulator Module.  I have a manufactured board from you so it's the default Regulator.  I am using a 12V 5A power supply, although I am reading only 11.1 at the VM pins.

AstroEQ Support / Re: TMC 2100 5V
« on: June 27, 2018, 04:25:53 »
So one of the 2100 when installed makes the VRM drop to 3.25 V. If I try to drive only one axis with the one that doesn't have that problem, it still doesn't enable the motor...

AstroEQ Support / Re: TMC 2100 5V
« on: June 27, 2018, 04:10:17 »
OK, sorry for the rapid fire posts.  I just pulled the tmc2100 drivers. If I read the voltage from the VRM without the driver modules installed it's 5v.   hmm.. maybe these modules are fried

AstroEQ Support / Re: TMC 2100 5V
« on: June 27, 2018, 04:06:35 »
Ok, I just answered my own question looking at the schematic.  It should be 5v.  So can anyone tell me why other than a failed VRM that it would be 3.25 volts coming out of the 5v regulator?


AstroEQ Support / Re: TMC 2100 5V
« on: June 27, 2018, 03:53:34 »
I was trying to get these working again now that I think my communication problems have been solved (it was the bug with 2.0 versions of Eqmod).

I can't make the tmc2100 work in my astroeq.  It configures ok, but the motors never enable.  I think it must be that these are 5v tmc2100 (not the 3 - 5v), and IM only reading 3.25V on the VI pin.  Is all the logic voltage 3v on astroeq?  Im guessing these won't work. 

AstroEQ Support / Re: Read failed
« on: May 01, 2018, 22:56:00 »
Ok, I can confirm a  few things.  The problem seems to be with the TMC2100 modules.

The astroeq will not configure with the TMC2100 5V modules installed. If I put the DRV8825 back in, everything works as expected.  Except see my hunts at end of slews.  That happens.

Anyway, Id love to get the TMC2100 5v modules working.  Thoughts as to why I can't connect or configure with the modules connected? Ive verified that they are plugged in the correct direction.  If I bend the 3 config pins out of the way, I can connect and configure using the utility, but eqmod locks up shortly after connecting, and if you manage to start a slew, you get a message about timeout exceeded.

My TMC2100 modules are the true 5v variety and from watterott (Silentstepsticks). 

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