Author Topic: Arduino Ascom Focuser  (Read 112 times)

0 Members and 1 Guest are viewing this topic.

NoelC

  • O. A. S.
  • Nebula Class
  • *
  • Posts: 37
Arduino Ascom Focuser
« on: Sep 30, 2017, 16:11:12 »
Having bought a new focuser (Baader Diamond Steeltrack) with a knob for a drive belt fitted; I had a go at building my own electronic focuser drive.  I based it upon TekkyDave's ArduinoAscomFocuser2  project and driver:-
https://sourceforge.net/projects/arduinoascomfocuser/
His project seemed to work remarkably well and come together quite easily (I bread boarded it and ran the original stepper under Ascom in 30 mins).  Because I wanted to change the project to suit a Nema 11 stepper etc it took me a good deal longer to get the final thing working.  The worst bit was the mechanics (my painting was pretty bad too).

(flickr page)
The jar of coins weighs 1.9kg.  I'm testing it here for accuracy, load, repeatability /missing steps.
A nice feature of Dave's code is the temperature sensor using the Dallas DS18B20, which reports the temperature back via Ascom.  The final thing weighs around 100gm and draws less than 0.5A when focussing, less than 0.2A when not in use.

The back view here (back removed) shows the stepper and Arduino Nano in place (12V and temp lead disconnected). I squashed it into a 50X50mm diecast box, but the stepper was a bit big for it.  The Baader focuser had a mini-dovetail track already on it to attach an electronic focuser.
Anyone happy tinkering with Arduinos might like this project.
« Last Edit: Oct 01, 2017, 10:01:36 by NoelC »
Synta mount, a bunch of telescopes and a shed (on wheels).

Carole

  • O. A. S.
  • Galaxy Cluster
  • *
  • Posts: 6943
    • Carole's images
Re: Arduino Ascom Focuser
« Reply #1 on: Sep 30, 2017, 17:20:29 »
Well done Noel.  I have yet to own an electronic focuser.  I am sure the guys able to do this sort of thing will be very interested.

Carole

MarkS

  • O. A. S.
  • Galaxy Cluster
  • *
  • Posts: 6833
Re: Arduino Ascom Focuser
« Reply #2 on: Oct 01, 2017, 18:55:31 »
Very nice.

It's a very worthwhile project.  Well done!

Mark

P.S. It was good to meet you at Wednesday's meeting - now I can put a face to your name :)

doug

  • Observing Officer
  • O. A. S.
  • Cluster Class
  • *
  • Posts: 1295
Re: Arduino Ascom Focuser
« Reply #3 on: Oct 02, 2017, 10:20:22 »
     When I bought Mick Welham`s Meade, he had converted it with an electric focusser ... it works very well.
Always look on the bright side of life ...