This shows the cutout section that slides over the dovetail bar on the ota. Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Nearly straight but will need some minor shimming to make it perfect. Sign up for a new account in our community. This will work with the sketch I have posted on the sourceforge site. I’ll be adding documentation to the wiki over the next few weeks including parts list, schematic plus anything else I think is relevant. Posted March 6,

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Ok so far so good – next I tried driving the focuser when attached to a SW ST80 using a direct shaft coupler – knock me down with a feather it works. Important Information We have placed cookies on your device to help make this website better. Posted June 16, edited. Register a new account. I have a working device based on an Arduino Nano and associated sketch.

Robert Brown’s Arduino ASCOM Focuser Pro DIY – AstroBin

Already have an account? Once I’m home later I can post some links. Sign up for a new account in our community. Diyy sign in with one of these services Sign in with Facebook. I’m going to look at making a smaller more portable version for my as well, something that is removable for a start.


DIY ASCOM focuser – IceInSpace

Maybe I need to find someone with a 3D printer. These come in nice convenient flat sheets of various thicknesses and are easily workable with hand tools and can also be heated, if you’re careful, and molded into rough-ish shapes.

Thank you Mr Brown. I had one fodus for the Mk1 focuser using gEda on Linux.

Update – Works in Windows 10 but it didn’t to start with – would connect then fall over with invalid response from Nano!. Removed the dependency on the AccelStepper library – I didn’t feel I needed this focjs for my geared Robofocus stepper motor.

For anyone chomping at the bit, soldering iron in hand here is a sketch to show how to connect the stepper motor control board to the nano. I needed two with the dovetail shape cut out and two with just the profile of the ota.

Thats how I picked it up. Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic.

I haven’t tried building it with any of the free ‘express’ versions of VS.


Fortunately there have been many individuals who have explored using an Arduino with one of the many low cost stepper controller boards to build a focus controller. Join the East Midlands Stargazers astronomy community today! When I went to look at it again some sscom the annotations pin numbers, signal names etc had disappeared.


Found making the telescope focuser brackets the hardest bit – as I am not a “Graham” – wish I were. I ran the four wires from these two motor ports to the pins of a female DB9 connector.

This is what needs to go in the box and I also need a switch on the 2 bare wires at some stage. The biggest issue I have had is how to fix the focuser to the ota. I need to try it when I am imaging planets or the Moon as that is where I thought manual control would be most beneficial.

I plan to document the driver, sketch and circuit diagram in due course. There are doy easy mounting points on the and I don’t fancy drilling holes. I’ve never used an Arduino but I’ve been itching to have a go. I started by cutting a cardboard template then used that to cut out the cork mats. Sign in Already have an account? Looking good, may have to un-ashameable rob some ideas.

At the time It was a purely manual device with a 5-way switch to set the direction and speed with a rotary encoder to do fine adjustments.

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