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Messages - ijdarroch

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1
DIY AstroEQ / Re: Increasing motor speeds with Mega 2560
« on: February 22, 2020, 01:24:24 »
Ooopps the wiring diagram didn't get sent in the last post.
Sorry about that
Ian

2
DIY AstroEQ / Re: Increasing motor speeds with Mega 2560
« on: February 22, 2020, 01:22:08 »
Hello Pierre
I am not sure that I understand your question re MS1, MS2 and MS3. I am using EQMod to access the Goto commands.
I have attached a wiring diagram for the TB6600.  and a sreen shot of the EQMod.
Regards
Ian

3
DIY AstroEQ / Increasing motor speeds with Mega 2560
« on: February 21, 2020, 18:15:53 »
Oh great and wise Oracle of AstroEq
I am trying to computerize a GEM that I was given along with a 14" Mak telescope. There are some unusual parameters: 1. The telescope weighs 240 Lbs. 2. The mount is huge.
I am using an Arduino Mega 2560 , TB600 drivers and .9 Deg Nema 23x82 motors. Everything is talking to each other and seems to work well in the tracking mode. ( although I have not actually tracked a star at this point)
The issue I have is the Goto speed. At the highest speed in Goto mode it slews  so slowly that it would take all night to get from park to a star I might wish to track.
Here are the settings for the Arduino:
ST4 Rate:0.9, Advanced HC: Disabled, GP101Driver Type; Open Drain ( I have tried both settings here), Motor driver IC type: DRV8834, uStep Gear Change: Disabled, Motor Microsteps: 32uStep. ( I have used all of the settings in this drop down menu and the 32uStep setting working the best)
RA Drive: Worm Rat: 18:1, Motor Drive Ratio: 4.14:1, Goto Rate (x sidereal): 468
Dec Drive: Worm Ratio: 19.48:1, Motor Drive Ratio: 4:1, Goto rae (x Sidereal): 551
I need the motors to get to a much higher rpm in the Goto setting but if I try to go higher in the Goto rate the motors lose their minds and vibrate.
Any ideas on how to get the motors up to 1000 RPM from about 50 RPM?
Please bear in mind that while I am a huge fan of Arduino I have never written any code and haven't a clue how to do it.
Thanks in advance.
Regards
Ian

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