A symple AF DIY way to control a stepper motor from a PC for astronomy
The aims of the project is simple setup, DIY hardware creation and use. However it aims to have a very rich feature set that 'just works', including but not limited to:
- Native USB connection (No more messing about with serial COM ports!)
- Sensorless homing/stall detection
- Dynamic current scaling to save power
- Configurability if needed past sensible defaults.
- Designed around common hardware, allowing for easy sourcing of parts for DIY construction using only bread-board-able components.
Tested and developed around my custom Nema17 belt driven focuser for a rokinnon 135mm lens and a Moonlite stepper motor attached to a GSO RC8.
Short demo video on rokinnon lens: https://www.youtube.com/watch?v=gBrDgyxgXSc
Homing and movement of Moonlite carrying full setup: https://www.youtube.com/watch?v=20G9TGgZjsw
I'm also aiming to have prebuilt modules available for sale in future once I'm confident in the quality of the design. Don't want to be accepting any money before I'm 100% confident in the product.
To actually make a SAF and get it properly setup, see the wiki for details - it list the ways you can make one and the extra HW needed for each As of right now the only way to control it is through an ASCOM driver, however I aim to add an INDI driver in the future.
https://github.com/AlistairSymonds/SympleAstroFocus/wiki
All supported by JLCPCB's assembly service, schematic available here: https://oshwlab.com/alistair.symonds/sympleaf_rev1_copy
By default the project is licensed under CC BY-NC 3.0, this does NOT allow for commercial use. If you would like to use the project in a commerical manner or some way otherwise incompatible with this license please contact me via email to find another solution.
This does not prevent you from buying some in bulk then splitting the price by selling at cost (no profit) eg buying 10 for your astro scoiety's inventory for members is allowed an encouraged.
If you're not making a profit, you're allowed to do whatever!
Summary of terms here: https://creativecommons.org/licenses/by-nc/3.0/