EQFocuser – Instructions

EQFocuser Description

The EQFocuser started as a DIY project powered by Arduino and ASCOM.  It is completely compliant with ASCOM and so far this is the focuser that I’m using with my telescopes.  I have a couple of variations that are using different types of motor depending on the need.  The project is open source and you can download the drivers and sketch files here https://github.com/EverettQuebral/EQFocuser

Supported Stepper Motor Controller

Hardware Parts

  • 1 Arduino (Nano – $5.00, Uno – $8.00)
  • 1 Telescope specific bracket (I 3D printed mine)
  • Set of screws for your focuser
  • Aluminum Flexible Shaft Coupling ($1.50) (Please select the size for your focuser)
  • 2 Pull Up Switch (Optional)
  • 1 Variable Resistor (Optional)
  • 1 DHT11 (Temperature/Humidity) Sensor (Optional)

For EasyDriver or Adafruit Motor/Stepper/Servo Sheild

For ST35 or 28BYJ-48



Diagram Using ULN2003 Motor Driver

ULN 2003 Motor Driver

Diagram Using EasyDriver

EasyDriver Pins


Github Location


Driver Download

You can download the latest Driver at the Release section https://github.com/EverettQuebral/EQFocuser/releases

3D Model Files

Available under the Resources folder

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