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Arduino ASCOM Focuser Pro DIY download for Windows

Free download Arduino ASCOM Focuser Pro DIY Windows app to run online win Wine in Ubuntu online, Fedora online or Debian online

This is the Windows app named Arduino ASCOM Focuser Pro DIY whose latest release can be downloaded as myFocuserPro-176-1.pdf. It can be run online in the free hosting provider OnWorks for workstations.

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Arduino ASCOM Focuser Pro DIY


myFocuserPro is an ASCOM and Moonlite compatible stepper motor telescope focus controller (DIY) based on Arduino Nano/Uno. A popular DIY ASCOM focuser with more than 108,000+ downloads.

(c) Copyright Robert Brown 2014-2022. All Rights reserved.
Permission is granted for personal and Academic use only.

If you find this useful, please send a donation to me via PayPal to [email protected] (Robert Brown).

Spreadsheet to calculate what stepper motor to use.


  • ASCOM driver tested with FocusMax, Nebulosity 4.1.1, APT v3.13 and ScopeFocus
  • Supported Driver Boards - A4998, ULN2003, L293D, L298N, DRV8825, EasyDriver, ST6128, RAPS128, TMC2225/2209
  • Software - Windows Application or fully compliant ASCOM driver
  • Create using stripboard layout or using PCB design
  • Tested with INDI moonlite driver under Ubuntu and Ekos
  • Tested on MacBook with TheSky and Moonlite driver
  • Manual or full automated remote control (eg focusmax)
  • Manual control by Push Buttons, Infra-red controller, rotary encoder
  • Manual zero position (hold down both push buttons for 2 seconds) or via application/ASCOM driver
  • Arduino code, ASCOM driver and Windows Application support for all build options
  • Multiple Language support
  • LED indications for IN, OUT (optional) and external PWR
  • LCD1602/I2C display (optional) for positional information (Current and Target positions)
  • Temperature probe support (optional - DS18B20 accurate to 0.5 degree)
  • Reverse voltage protection on 12VDC input
  • Option1: 28BYJ-48 Stepper Motor and ULN2003 driver board using Arduino Nano
  • Option2: NEMA17HS15-0404S-PG5 Stepper Motor and L293D Motor Shield using Arduino Uno
  • Option3: NEMA17 and DRV8825 driver board - up to 6400 steps per revolution!
  • Option4: NEMA17 and EASYDRIVER board - up to 1600 steps per revolution
  • Specify Reverse Direction, Coil Power, Stepping mode in either ASCOM or Windows application
  • Important focuser parameters stored in controller EEPROM and retrieved when driver/application connects
  • Full build instructions, diagrams, test scripts, comprehensive manual, bracket design and more
  • Detailed instructions on initial setup, operation and selection of stepper motors
  • Full parts list with suppliers, costs and build options
  • Bluetooth Wireless adapter HC05 option



User interface

Win32 (MS Windows)

Programming Language

C#, Assembly


Hardware, Astronomy

This is an application that can also be fetched from https://sourceforge.net/projects/arduinofocuscontrollerpro/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.