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 » Focus motor controllers.
Shoestring FCUSB Focus Motor Controller
Controls DC Focus Motor via USB port and software on your computer
Shoestring FCUSB focus motor controller.
  • FCUSB plugs directly to PC USB Port
  • Cables included
  • ASCOM Focus compliant
  • Computer software included:
    • FocusPal
    • ASCOM drivers
  • Available in 2 USB port identifiers:
    1st or 2nd.
Shoestring Astronomy
Interface Cable
CCD Camera
Shoestring FCUSB Focus Motor Controller
The Focus Motor Controller kit contains:
  • FCUSB Focus Motor Controller (connects to computer's USB port).
  • Includes 3 metre (10-foot) cable (3.5/3.5mm, choice of M-F or M-M) normally available seperately. The side of the cable that plugs into the FCUSB must be Male.
3m 3.5/3.5mm M-M or M-F cable.
Choice of cable
3m (10-foot) Male-to-Male (3.5/3.5mm M-M) cable. £0.00
3m (10-foot) Male-to-Female (3.5/3.5mm M-F) cable. £0.00
Optional Accessories
FCUSB2 version to be used as 2nd focus motor controller. + £0.00
3m (10-foot) Male-to-Female (3.5/3.5mm M-F) extension cable. + £8.00
Order No. Price (inc_VAT) Shipping Delivery click to purchase
SSFCUSB £ --- £ ---
User Manual 1.1
Driver (EXE)
Driver (EXE)

The FCUSB is a product that allows you to control a DC focus motor (or any DC motor for that matter) by way of a USB port and software on your computer. If you are already using a computer in your observatory for other reasons, this provides a way for you to focus your telescope without fumbling around in the dark for the focuser handcontroller. It works best with 5V focus motors such as the newer style JMI Motofocus, but can also work with 9V or 12V motors. Motors requiring up to 100mA of current will work with the FCUSB.

The FCUSB also eliminates the need for a battery to run your focuser, since the motor is now powered directly from the USB port of your computer. Using the free FocusPal software, you can control the speed and direction of your motor with just mouse clicks! For further information, please read through the FCUSB User Manual Third-party software that supports the ASCOM Focuser standard will also work with the FCUSB using the FCUSB ASCOM driver. DC focus motors don't provide absolute positioning repeatability like a stepper motor does, but Shhoestring Astronomy has tried the FCUSB with third-party autofocusing software and obtained decent results. However, there is no guarantee that this will work for all systems.

FocusPal Software
You have many choices on software to use with your FCUSB. You can use any third-party software that supports the ASCOM Focuser standard, or you can use FocusPal from Shoestring Astronomy. It is a stand-alone program that allows you to control the speed of your focus motor, and to run the motor in and out. It is free and can be downloaded using the link found below. Even if you plan on using third-party software, you should download and install FocusPal to verify that your FCUSB, computer, and focus motor are all working properly together.

If your system works fine with FocusPal, but not with your third-party software, then the problem most likely lies with the third-party software and you should contact them for technical support. If your system does not work with FocusPal, then you should contact Shoestring Astronomy for technical support.

Why the FCUSB2?
Many astrophotographers need to use two focusers, one for their imaging scope, and one for their guide scope. One of the inherent problems with most USB devices is that when two of them are used, they will appear identical to the computer and there is no easy way to tell one from the other. Thus, Shoestring Astronomy created the FCUSB2. It is identical to the FCUSB in all respects except for its USB identifier. So, if you wish to run two focusers, you will need a FCUSB and a FCUSB2. The FCUSB will work with only FocusPal, the FCUSB ASCOM driver, or the FCUSB FocusAPI driver. The FCUSB2 will work with only FocusPal2, the FCUSB2 ASCOM driver, or the FCUSB2 FocusAPI driver.
Driver (EXE)

We are constantly checking the accuracy of the technical data. We are prepared to provide more detailed information on request. Technical data is subject to change without notice.

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