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 1 
 on: February 19, 2019, 22:07:36 
Started by NeungAstro - Last post by Victor_M
The NEMA nomenclature is refering about the size of the motor, not its power of torque, so you have to choose the apropriate motor depending on thr room in your mount and the size of your telescope. For a"normal" telescope I think the smaller motor in your pictures will work fine

 2 
 on: February 19, 2019, 19:36:17 
Started by gordtulloch - Last post by TCWORLD
If the En pin is not being driven low, it suggests either there is a bad solder joint, or there is a short to another pin.

Could you post a photo of the back of the board?

 3 
 on: February 19, 2019, 19:26:48 
Started by NeungAstro - Last post by Zh
i have like type 1 and they works good but type 2 also must be ok,
Motors are quite different in size and shape so better consider which one is better to mount.

 4 
 on: February 18, 2019, 21:59:10 
Started by gordtulloch - Last post by gordtulloch
Which motor drivers are you using?

Once EQMOD is connected and unparked, I would probe the EN pins (pin 1) of the motor drivers - these should be at 0V when the motors are enabled.

Hi again - finally getting back to this, got through checking cables etc all good, but yes the EN pin is >0 - what can cause that?

Regards,
  Gord

 5 
 on: February 17, 2019, 03:00:04 
Started by NeungAstro - Last post by NeungAstro
Those who know help consider Motor
Between these 2 motors, which one is more suitable?
Thank you.

 6 
 on: February 16, 2019, 13:42:38 
Started by NeungAstro - Last post by NeungAstro
Hi Tom
I received the equipment of AstroEQ 4.6, ATMega162-16PU and PIC18F14K50-I / P and Parts List of Element14 such as Resistors, Capacitors and various ICs as Tom suggested.
What is lacking is
1. Worm wheel RA, DEC and
2.Stepping motor
As for the Worm wheel, I would like to make a similar version of AstroPhicsic with a 5.9 "Worm wheel, 225 tooth
For Stepping motor, I am thinking of using a closed loop stepping motor motor NEMA 14-17. Is it suitable?
Selecting the motor that Tom had recommended that choose 2 phase Bipolar 6-12V <1.2A / phase
Or it is a stepping motor with a built-in encoder
So I have the following questions:
1. Can I order the Worm wheel 225 tooth to work with AstroEQ?
2. Can stepping motor that I choose to have closed loop?
If it is inappropriate or difficult to do Please advise me too.

Regards,
  Thanom

 7 
 on: January 28, 2019, 23:02:04 
Started by gordtulloch - Last post by gordtulloch
I'm using DRV8825 drivers, I'll check that -- gt

 8 
 on: January 28, 2019, 22:04:55 
Started by gordtulloch - Last post by TCWORLD
Which motor drivers are you using?

Once EQMOD is connected and unparked, I would probe the EN pins (pin 1) of the motor drivers - these should be at 0V when the motors are enabled.


 9 
 on: January 28, 2019, 21:52:31 
Started by gordtulloch - Last post by gordtulloch
Hi there - I finished off a build of the AstroEQ using the PCB and pre-burned ICs the other day. After soldering everything up I went over the board with a continuity tester and made sure that all of the connections were working and it looked good (despite my not so great soldering skills.) I plugged the board in and configured it using the AstroEQ software, which worked fine. I can connect to the board using EQASCOM and all appears well. Except, the motors don't move, or even warm up. I tried cranking up the current limit progressively, powering down, giving the screw a 1/4 turn, then powering up but nothing.  I have RJ12 cables running from the board to an RJ12 connector on the motor mount.  The pinout I used for the RJ12 cables from the board to the motors is as follows:

A1 -> 5
A2 -> 2
B1 -> 3
B2 -> 4

Next step I guess is to build a breakout board to see what signals are coming out of the motor ports, any other way anyone can suggest to debug the motor side of the circuit? Thanks!

Regards,
  Gord


 10 
 on: January 09, 2019, 12:15:36 
Started by plop3 - Last post by plop3
Thank you  :)

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