Motor controllers & drivers

  • GT1 – Goto stepper controller for telescope mountsGT1 - Goto stepper controller for telescope mounts
    The GT1 is a stepper motor controller for telescope mounts, an upgrade for your telescope to be a motorized goto system. With the GT1 is possible to computerize any kind of mount. Any gear ratio can be configured, also the maximum speed and the stepper wiring can be configured by a single application in a very simple way.

    The GT1 supplies a maximum of 1 Ampere current on each motor winding, allowing direct usage with the NEMA17 motors. The GT1 supports overvoltage up to 18v for greater torque.

    A customizable I/O port can be configured as ST4 autoguider input or DIR/STEP driver control.

    The GT1 is compatible with the Skywatcher SynScan handset, it is EQMOD-ready, so you can use it standalone or by PC connection using planetary software like SkyCharts, KStars or other software.

    It is also possible to drive the GT1 from the smartphone using INDI and KStars for Android.

    The maximum speed has no limit, but must be appropriate to the load and weight of the telescope and the torque of the engines.

    There is a C SDK available for users that want to integrate the GT1 for their software or hardware setup.


    • Compatibility: SynScan, EQMOD, ASCOM, INDI
    • max steps: 16777216 – Automatic calculation during configuration
    • maximum speed: Automatic calculation during configuration – optimizable
    • microstepping resolution: Automatic calculation during configuration – depends on total gear ratio
    • External port configuragle as ST4 input or DIR/STEP output
    • Customizable microstepping PWM frequency
    • Options for microstepping or half-step tracking
    • Preliminary calculation of microstepping PWM frequency
    • Inputs:
      • ST4 Autoguider/DIR-STEP output – RJ 12
      • HC/EQDIR – RJ45
      • 12v Power – 5mm Jack
    • Outputs:
      • Right Ascension – RJ12
      • Declination – RJ12
    • Recommended power supply: 12v@3000mA
    • Extras:
      • Editable motor winding configuration by software
      • Custom parameters saved read-only, editable by the configuration software

    The configuration software can set motor parameters, go-to acceleration and maximum speed.

    Download the GT1 Configuration utility for Windows. Download the Ubuntu library .deb: i386 amd64 armhf arm64 Download the Ubuntu configuration utility .deb: i386 amd64 armhf arm64

    Read the GT1 Usage Guide for informations on the correct usage of the GT1 controlle

    To upgrade the firmware connect the programmer and install the USB driver using Zadig Many thanks to Paolo Fini for DIR/STEP, PWM frequency calculator and half-step mode proposals and testing Thanks to Marco Rigo for microstep multiplier/divider hint, allowing high reduction ratio mounts to be compatible   Availability:
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  • PM5 – 4 channel 5A Power drive for the GT1PM5 - 4 channel 5A Power drive for the GT1

    The PM5 can drive 4 power lines at a current of 5A each. switching in range of up to 24 volts to 0 at a maximum frequency of 10KHz.

    The PM5 is compatible with a single motor output of the GT1 at input end, while the output connector is compatible with the old telescope mounts standard DB9 port, so old equipment is suitable for use.

    Features and connectors:

    • RJ12 digital input connector, 0-5v to 0-24v
    • DB9 output connector
    • High current and voltage: up to 5A/24V impulsive per channel
    • Optical input insulation

    Read the PM5 Usage Guide for informations on the correct usage of the PM5 driver



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