×

INDI Library v1.9.8 Released (29 Sep 2022)

Bi-monthly INDI Library released with new drivers and bug fixes.

Controller for stepper motor focuser

  • Posts: 117
  • Thank you received: 5
Hi,
I'm developing a new focuser to my refractor. It use push pull screws to move the focuser drawer tube. I 3D-print the different items I need.



It's a 3" focuser and a NEMA 17 stepper motor. It's designed for up to 5 kg load. You can read about it here, from page 12 to 14:

www.astrofriend.eu/astronomy/projects/pr...-focus-friction.html

I'm now ready to start with the controller board for the stepper motor but I don't know where to start.

I use Astroberry and the controller must use some INDI driver.

It must be flexible, I have read about Arduino that many people use. Some standard board that contain the drivers for stepper motor. Something simular that I use in my 3D-printer but smaller.

It must be an open source.

I only controll it from Astroberry, but there can be a focus out and a focus in button for test purposes.

Maybe ready for a micro switch that sense when it is at zero focus position.

Now my question, where do I found the best open source controller project. Instructions what hardware to use, how to install software etc ? I have never worked with an Arduino so it must have the details how to do it.

/Lars
TS130 APO & 3" field flattener / Pentax 645 ED 300mm f/4
EQ6 mount / HEQ5
Canon EOS 6D
Lot of patience

Homepage:
www.astrofriend.eu/
Last edit: 6 months 1 week ago by Lars.
6 months 1 week ago #83040
Attachments:

Please Log in or Create an account to join the conversation.

  • Posts: 117
  • Thank you received: 5
I have now learn a lot from different focuser project I have found and read about. I decided to go for the Focuser Pro 2, an open source project. It use an Arduino to control the stepper motor and it has software and drivers both for ASCOM and INDI.

Here I have collected the information I found and what options I want to include, very basic because I controlled it from Raspberry:

www.astrofriend.eu/astronomy/projects/pr...or-focus-driver.html

When searching for the items I need to buily this I sometimes have problems to find them, maybe it's an old project and the parts have been replaced by new versions.

/Lars
TS130 APO & 3" field flattener / Pentax 645 ED 300mm f/4
EQ6 mount / HEQ5
Canon EOS 6D
Lot of patience

Homepage:
www.astrofriend.eu/
Last edit: 6 months 6 days ago by Lars.
6 months 6 days ago #83159

Please Log in or Create an account to join the conversation.

  • Posts: 102
  • Thank you received: 21
Focuser Pro is NOT open source (at least not for a DFSG definition of the term). It is personal / academic use only at best and a copyright nightmare at worst, e.g. it states in myfocuserpro2-designs.pdf: "The schematic, code and ideas are released into the public domain. Users are free to implement these for their personal use, but may NOT sell projects based on (or derived from) this project for commercial gain without express written permission granted from the author." Then it goes on to state that "you cannot sell kitsets or assembled units to others". If the first sentence was true, none of the restrictions would be possible. In other documentation the source code is MIT, which allows commercialization.

For this reason I went with ardufocus.com/, which _is_ Open Source (GPL, as long as you don't use the PCB, which is CC-BY-NC-SA). This one is supported by the moonlite focuser driver, which is part of indi.
6 months 4 days ago #83185

Please Log in or Create an account to join the conversation.

  • Posts: 113
  • Thank you received: 5
Hi Lars,

I have been using TIC_Focuser_NG for a long time now, it is about the only thing that has never failed on my Astroberry.

github.com/sebo-b/TicFocuser-ng

Cheers
Malcolm
Telskop Service TS80 480mm APO FL53 Glass
Canon 450D DSLR
ASI120MM Guide camera.
HEQ5 Pro
TIC Focuser NG
Raspberry Pi 4 8GB with Astroberry
The following user(s) said Thank You: Andrew
6 months 3 days ago #83196

Please Log in or Create an account to join the conversation.

  • Posts: 1279
  • Thank you received: 222
Thanks for sharing that. I didn't know about the Tic Focuser project. Very neat and tidy.
INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Waveshare Stepper Motor Board - DIY Focuser
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
6 months 3 days ago #83204

Please Log in or Create an account to join the conversation.

  • Posts: 117
  • Thank you received: 5
Thanks for all ideas and hard drive information. For my project the Ardufocus look interesting. It can handle two focus motors, for my stationary setup it maybe can be good to have another focus motor on the guide telescope. It also looks easy to address the outputs to different pins.

I updated my page with the new links.

Thank you !

/Lars
TS130 APO & 3" field flattener / Pentax 645 ED 300mm f/4
EQ6 mount / HEQ5
Canon EOS 6D
Lot of patience

Homepage:
www.astrofriend.eu/
6 months 3 days ago #83206

Please Log in or Create an account to join the conversation.

  • Posts: 18
  • Thank you received: 0
Hi Lars,

If you use the Adafruit DC and Stepper Motor HAT for your Astroberry, the drivers are already enabled in the Astroberry firmware and it's just a case of connecting the four wires of your stepper to the HAT. I use this very successfully in my observatory.

Adafruit details are here: learn.adafruit.com/adafruit-dc-and-stepp...hat-for-raspberry-pi

Hope this also gives you an option for your setup.

Cheers

Mark
5 months 1 week ago #83716

Please Log in or Create an account to join the conversation.

  • Posts: 75
  • Thank you received: 5
INDI/KStars on Raspberry Pi 4, 4gb
Raspberry Bull 64bit
Skywatcher 150PDS
CGE-PRO Mount
Nikon D5300 Camera
ZWO183MM
ZWO ASI120mm
Whaveshave focuser
5 months 1 week ago #83722

Please Log in or Create an account to join the conversation.

Moderators: Radek Kaczorek
Time to create page: 0.627 seconds