Gremsy S1V3 Manual

  • 01. Introduction

    The new S1 features HDMI Quick Release as well as new I/O design and the ability to start up in 2 seconds. Moreover solid and clean design allow durability and ease of setup with plenty of cameras up to 1.6lbs

  • 02. Features
    HDMI Hyper Quick Release
    New mechanical and electrical integration quick release features floating connectors that allow to transmit high speed HDMI video signal while still maintaining reliability after many mating cycles.
    Plug & Play
    Say goodbye to complex setups and time consuming processes. The S1 provides an easy one step plug and play installation that takes only 5 seconds to complete.
    New I/O Design
    Intuitive hardware interface including a variety of ports has relocated on QR to quickly interface with multiple devices such as 3rd party flight controller, remote control, auxiliary I/O and power your ideal system of cameras/accessories.
    Heated & Temperature Controlled IMU
    Heated and temperature controlled IMU sensor with advanced 6-point calibration allows reliable performance even in extreme weather. Temperature is maintained within 0.2 degrees Celsius accuracy.
    High Performance Gimbal Controller
    gMotion Controller, designed and made by Gremsy based on a 32 bit high performance ARM microprocessor providing fast response and accurate calculation. Sensor data and motors correction are updated as fast as 2000 times per second to enable incredibly smooth footage.
    No exterior wires, more solid. This clean design helps the S1 overcome wind resistance with ease to bring out the best video quality while staying agile.
    The S1 has a lot of nice features that enable users to apply it not only for aerial inspection and mapping but also for high end aerial cinematography.
  • 03. Specification
    Product Name Gremsy S1V3
    System Type 3-Axis Digital Gyro-Stabilized
    Weight 1.8 lbs / 830 g
    Camera Cage (Standard) (W X L X H) 120mm x 65mm x 75mm
    Construction All Aluminum
    Input Voltage 14 – 52V
    Working Current

    Static Current 300mA @14.5V

    Dynamic Current 600mA @14.5V

    Locked Motor Current Max 4A @14.5V

    Connection USB, CAN, UART, BLUETOOTH
    Payload 1.6 lbs / 750 g
    OS Platform Supported Windows / Mac / iOS / Android
    Single Operator Follow Mode / LB2
    Dual Operator SBUS / Spektrum / PPM / LB2
    Pan Range +/- 345 degree
    Tilt Range +160 / -190 degree
    Roll Range +50 / -100 degree
    • 01. HDMI Hyper quick release
    • 02. Pan motor
    • 03. Pan adjustment
    • 04. Roll motor
    • 05. Gimbal controller
    • 06. Roll adjustment
    • 07. Tilt motor
    • 08. Tilt top bar
    • 09. Camera plate
    • 10. Tilt front- back adjustment
    • 11. Tilt vertical adjustment
    • 12. Top bar adjustment knob
    Hyper Quick Release Connectors & Pinouts

    POWER: to get power directly from external batteries of the drone or other power supply. Voltage input ranges from 15V to 52V and is down-converted to a stable 14.5V by the internal circuit to provide power to gimbal and accessories.

    Connector type: Molex Microfit 3.0 2 pin


    CAN: to interface with CAN bus on DJI Flight controller or another module that uses CAN bus.

    Connector type: JST SM04B-GHS-TB


    COM2/COM4: to interface with Pixhawk or Pixhawk 2 via Mavlink protocol or other modules that use serial protocol (UART).

    Connector type: JST SM06B-GHS-TB


    SBUS/PPM:To interface with SBUS/PPM receiver.


    AUX:: There are S1, S2, S3,...,S8,S9 optional signals (0.25A max) for users to connect to other devices such as AV signal or camera trigger...This port is internally connected to AUX port on the camera tray.

    Connector type: JST SM10B-GHS-TB


    USB: to interface with computer or upgrading firmware.

    Connector type: Micro USB TYPE B


    JR: to interface with JR/SPEKTRUM satellite receiver.

    Connector type: JST S3B-ZR


    HDMI: HDMI video output from the camera.

    Connector type: Micro HDMI


    AUX: There are S1, S2, S3,...,S8,S9 optional signal (0.25A max) for users to connect to other devices such as AV signal or camera trigger...This port is internally connected to AUX port on the Hyper Quick Release.

    Connector type: JST SM10B-GHS-TB


    PWT: 14.5V 2A output for camera and accessories.

    Connector type: JST S2B-XH-A(LF)


    HDMI: HDMI video input from the camera.

    Connector type: Micro HDMI

  • 06. What's in the box
    • 01. GREMSY S1 GIMBAL
      • A. Micro USB Cable (x1)

      • B. Power Supply Cable (x1)

      • C. Canlink Cable For Pixhawk (COM2/COM4) (x1)

      • D. Sbus Cable (x1)

      • E. Auxiliary Cable (x2)

      • F. PWT Cable (x1)

      • G. Allen Key Set (x1)

  • 07. HDMI Hyper Quick Release
    Mounting Hyper Quick Release

    Using 32mm square M3 pattern to mount the top part onto the frame or damping isolator.


    STEP 1: The marks on the top part and bottom part must be aligned. The button on the ring should be aligned with the unlocked icon as shown in the first picture.

    STEP 2: Keep everything aligned and attach the bottom part to the top part.

    STEP 3: Rotate the ring clockwise until hearing a snap, the button should be automatically popped out and aligned with a locked icon.


    STEP 1: Press and hold the button.

    STEP 2: Rotate the ring counterclockwise.

    STEP 3: When the button aligns the unlock icon, the S1 can be detached from the top part of Hyper Quick Release.

  • 08. Powering Up The GREMSY S1

    After connecting to the power supply, the gimbal will perform a series of alignments, self tests, which last about 2 seconds and will determine the status of the gimbal, indicated by the Status LED color. During this time, don’t touch the gimbal or camera.

    Always start the gimbal with a balanced camera set up otherwise after initialization the controller will return an error followed by a red color indicator.

    Step 1

    Make sure the Hyper Quick Release is mounted to the drone and its power port is already connected to the power supply correctly. Next, let’s mount the gimbal to the Hyper Quick Release, it will be automatically powered up.

    Step 2
    Wait about 2 seconds, do not touch the gimbal or camera.
    Step 3
    If the status LED is blinking green, the gimbal is ready for use. By default, the gimbal is in Follow mode if the motors are turned ON by the Function Button.
    If the status LED is solid red, something is wrong with the gimbal and motors can not start. Connect to the software/apps to check details of the error message.
    Read “LED STATUS INDICATOR” in next section for more information.
  • 09. Status LED Indicator
    01 Blink Low Battery
    02 Solid System Error (Motor or IMU)
    03 Blink Calibrating
    04 Solid System Boot
    05 Blink System Ready
    06 Blink Lock Mode
    07 Solid Follow Mode
    08 Blink Remote with Lock Mode
    09 Solid Remote with Follow Mode
    10 Blink Auto-tuning in process
    11 Blink Canlink with Lock Mode
    12 Solid Canlink with Follow Mode
  • 10. Operation Modes

    LOCK MODE: is a stabilization mode where the camera maintains orientation independently of the rest of the gimbal and the orientation can be changed by an external control signal from remote control.

    FOLLOW MODE: in this mode, the camera will mimic the operator’s movement and allows one person to control camera tilt and pan without using an external device like a remote control.

    GREMSY S1 Supports


    DUAL OPERATOR: a second operator can use a Remote Controller (SBUS, SPEKTRUM, PPM) to control gimbal’s movement.

  • 11. Working Operation

    GREMSY S1 has 2 working operations: Normal and Inverted.

    After powering up the gimbal , it will automatically detect if the gimbal is in inverted operation or normal operation based on pan motor position.
    During working, switching to another working operation made easy by changing pan motor position, the gimbal will automatically detect new types of working operation.
  • 12. Swithching Between Modes

    Using function button

    Once time Turn motors ON
    2 times Lock mode
    3 times Follow mode
    Hold 3 seconds Turn motor OFF

    Using mode channel on remote control

    High Follow mode
    Motors ON
    Midle Lock mode
    Motors ON
    Low Motors OFF

    Using software/application

    If there is a remote control signal, changing modes or turning motors on/off by other methods such as using the function button or software will not take effect because the remote control signal has the highest priority and override the command.
  • 13. Installing Software/ App

    Mobile apps are available in App Store and Google Play

    App name: gTune

    Searching: “gremsy gtune”


    Desktop software

    Download at: -> Support -> Product Support -> GREMSY S1

    To configure and monitor data of Gremsy software/app either USB/Wi-fi connection is required.
    Make sure the Silab USB driver is already installed. The driver can be found at: -> Support -> Product Support -> GREMSY S1
    • 1 - Power ON the GREMSY S1.
    • 2 - Connect USB cable from gimbal controller to Mac/PC.
    • 3 - Run the gTuneDesktop software.
    • 4 - On Connection Tab, select the Serial option.
    • 5 - Select the correct COM port in the list.
    • 6 - Click on the “Connect” button.
    • 1 - Enable bluetooth adapter of mobile devices
      On Android: the OS will ask for Location Data permission for BLE scanning feature (updated by Google since Android 6.0) On iOS: the OS will sometimes have issues with its Bluetooth adapter. Users should check the device’s quick settings and general settings to enable the adapter and the Bluetooth icon should appear on the device’s status bar.
    • 2 - Turn ON the gimbal and run the app.
      After switching to Bluetooth, the app will begin scanning for Gremsy Bluetooth integrated gimbals.
      If only one gimbal is found, it will be connected automatically.
      If more than one gimbal is found, a list of gimbals will be shown to allow the user to select the desired one.
      If no gimbal is found, an error will be shown.
  • 15. Balancing
    To achieve the best performance from the S1, proper balancing is necessary. Accurate balance is critical in shots where the gimbal will be subjected to extreme movements or accelerations. There are 3 axes that need to be precisely balanced prior to powering up the gimbal.
  • 16. Mounting The Camera
    Use a 1/4”-20 screw to secure the camera to the camera plate, then put the camera on the gimbal and tighten the top bar screw slightly.
  • 17. Tilt Axis Vertical Balance
    When the proper vertical balance is achieved, you can rotate the camera in any angle and it will stay at that position.

    1. Rotate the tilt axis so that the lens is pointing upward.Then, loosen vertical adjustment thumb screw, gently slide the camera mount crossbar and the top bar forward and backward until the camera remains pointing upward when released.

    2. Tighten the thumb screw. Sometimes, the vertical balance could not be achieved, the front-back balance should be rechecked in this case.

  • 18. Tilt Axis Front-Back Balance
    When the proper front-back balance is achieved, the camera will stay level when you remove your hands.

    1. Loosen the thumb screw underneath the camera plate and the top bar screw. Then, gently slide the camera forward or backward until the tilt axis remains level.

    2. Tighten the thumb screws to lock the camera and camera plate in position. Tighten the top bar screw and knob.

  • 19. Roll Axis Balance
    When the proper left-right roll balance is achieved, the camera will stay level when you remove your hands.

    1. Loosen the thumb screw underneath the roll bar, then gently slide the roll bar left or right until roll axis remains level.

    2. Tighten the thumbscrew to lock the roll bar in position.

  • 20. Pan Axis Balance
    Tilt the gimbal about 20 degrees, identify if the gimbal is front heavy or back heavy. Slide the pan axis slider until the camera does not swing.

    1. Loosen the thumb screw, then gently slide the pan axis slider backward/ forward until it doesn’t swing and stay at any given position when released.

    2. Tighten the thumb screw to make sure pan axis slider is locked in position.

  • 21. Software - Tuning
    After the camera is balanced on the Gremsy, it’s time to fine tune some parameters for best performance.
  • 22. Stiffness Tuning
    Stiffness setting has a significant impact on the performance of the S1. This setting adjusts the degrees to which the gimbal tries to correct for unwanted camera movement and hold the camera stable. The higher you can run the setting without vibration or oscillation, the better.
    General Method
    Start with a low value of 20 for all axes then turn motors ON. Slowly increase this setting until you feel an oscillation in each axis, then reduce it until the oscillation subsides. You can touch the camera to feel the oscillation during tuning. Increase the stiffness setting 5-10 points at a time until oscillation appears then reduce 5 points until oscillation subsides.
    Step 01 - Tilt Stiffness

    Slowly increase this setting until you feel an oscillation in the tilt axis, then reduce the setting until the oscillation subsides. Make sure there is no vibration when tilting the camera up and down and when moving the gimbal in any orientation.

    Step 02 - Roll Stiffness

    Slowly increase this setting until you feel an oscillation in the roll axis, then reduce the setting until the oscillation subsides. Pick the S1 up and make sure there is no vibration when you move the gimbal around.

    Step 03 - Pan Stiffness

    Slowly increase this setting until you feel an oscillation in the pan axis, then reduce the setting until the oscillation subsides. Tilt the S1 about 20 degrees from the verticality and make sure that no vibrations are presented.

  • 23. Filter

    The purpose of the filters is to eliminate noise and vibration due to structural resonances in the camera, lens, or gimbal.

    Setting the filters too high or too low can cause signal disturbances that can reduce the overall stabilization.

    Gyro Filter

    Defines the strength of the filter applied to Gyro sensor output. If the gimbal has oscillations that cannot be corrected by adjusting stiffness settings, the Gyro Filter is used to further tune the gimbal and remove the oscillation.

    Output Filter

    Defines the strength of the filter applied to motors output. If the gimbal has oscillations that cannot be corrected by adjusting stiffness settings, the Output Filter is used to further tune the gimbal and remove the oscillation.

    1. If the gimbal is vibrating at a high frequency after tuning, increase the filter values.

    2. If the gimbal is oscillating or rocking at a low frequency after tuning, decrease the filter values.

    Default Values
    Gyro Filter 2
    Output Filter 3
  • 24. Expert / Advanced Settings

    There are some expert parameters that normally do not need to be adjusted. Leave these parameters at default settings unless they are required for troubleshooting.

    Hold Strength

    If “Auto power adjustment” is enabled, “Hold strength” will be the minimum power level required for the corresponding axis. The controller will automatically adjust power level from minimum to maximum level depending on the displacement between current angle and commanded angle.

    If “Auto power adjustment” is not selected “Hold strength” will be constant power level provided to the corresponding axis and should be adjusted manually. This option is only recommended for advanced users.

    For heavy cameras, it’s suggested to increase hold strength for each axis around 10% than the default value. If “Auto power adjustment” is not selected “Hold strength” will be fixed power level provided to the corresponding axis and should be adjusted manually. This option is only recommended for advanced users.


    Defines how fast each axis will return to commanded position. To reload default expert settings just press “Default” in the expert menu.

    Default Settings
    40 40 40
    GAIN 120
  • 25. Follow Mode Settings

    The most widely used mode of single operation is Follow mode where the gimbal operator controls to pan and tilt of the camera. The camera movement will mimic the user’s input from the top-mount while the footage remains stable. The follow mode can be configured to be either very linear and robotic, or smooth and cinematic.

    Follow mode settings is available for Tilt axis and Pan axis.


    Defines how fast camera will follow the movement.


    Smooth out the camera movement by adjusting this parameter. The higher the value is the smoother camera moves but at the expense of more delay in following the movements.


    When the movement is out of the window zone, the camera starts to move. Within the window zone, the camera maintains its direction.

    Tilt Lock

    If this option is selected, the tilt axis will maintain its angle and only be controlled by remote control.

    This feature is not available on the S1.
  • 26. Rotation Limit
    Travel of Tilt and Roll axis can be limited using UP LIMIT and DOWN LIMIT. The Pan axis keeps the ability to pan 360 degrees itself.

    Set the up limit for Tilt or Roll axis (in 1 degree unit). The default values are -90 for Tilt and -45 for Roll.


    Set the down limit for Tilt or Roll axis (in 1 degree unit). The default values are 90 for Tilt and 45 for Roll.


    Set the Roll offset (in 0.1 degree unit) is only applicable when there is no remote control signal since remote control will override the roll angle. This is useful to fine trim the horizon. The default value is 0.

  • 27. IMU Sensor

    The IMU sensor used in the S1 is a combination of a high precision 3 axis gyroscope sensor and a 3 axis accelerometer sensor.

    IMU board is enclosed in a weather proof case and being heated where the temperature inside is controlled around 50°C with 0.2°C accuracy. Thanks to this feature, gyro calibration is no longer required in most situations.

    In order to provide extra high precision data output, the IMU is performed 6-point calibration at Gremsy factory.

    The S1 controller has a special algorithm to provide attitude estimation based on input data from the IMU sensor. This attitude estimation helps the controller to command motor output to compensate for camera movement.

    Gypro Calibration

    Thanks to temperature controlled and heated IMU, gyro calibration is not necessary as the gyro was calibrated at the factory and the temperature inside IMU remains constant around 50 degrees. However, if you notice drift during operation in extreme weather (below -20C or above 50C) please re-calibrate the gyro.

    CALIB AT STARTUP: this feature is not available on the GREMSY S1

    After Gyro Calibration, Gyro Offset X, Y, Z will change to a new value depending on the temperature.

    Accelerometter Calibration

    Do not use this function, please contact Gremsy Support Engineers.
    Accelerometer sensor was calibrated properly at the factory to achieve an accurate horizon level with special and precise equipment. Users do not need to do this unless it’s required for troubleshooting.

  • 28. Remote Control

    GREMSY S1 supports SBUS , SPEKTRUM and PPM receivers. There are some parameters to be aware of before assigning channels to the receiver.

    SMOOTH: increasing this number will smooth out the movement of the corresponding axis but will also cause a delay.

    SPEED MODE: when speed mode is selected, the speed of the corresponding axis will depend on how far the stick position is from the neutral position. It is recommended that TILT and PAN channels should be set to speed mode.

    ANGLE MODE: when angle mode is selected, the corresponding axis will move to the angle set by current stick/knob position. It’s recommended ROLL channel should be set to angle mode.

  • 29. SBUS/PPM Settings
    Receiver Connection

    Connect SBUS/PPM receiver to the Hyper Quick release as shown below.

    The receiver must be connected to correct wires. The SBUS/PPM port has 5V output to power the receiver, please do not use external power supply to power the receiver at the same time. Doing so may damage the electronics inside the gimbal.

    Channel Setting

    There are 6 channels to assign: MODE, TILT, ROLL, PAN, TILT SPEED, PAN SPEED.

    Assign MODE channel first then follow the order above because MODE channel is used to change operating modes of the gimbal and should be assigned to a 3-position switch as follows:

    • Switch at high position: FOLLOW MODE , MOTORS ON
    • Switch at middle position: LOCK MODE , MOTORS ON
    • Switch at low position: MOTORS OFF

    TILT and PAN channel should be in speed mode and ROLL channel in angle mode.

    TILT SPEED or PAN SPEED could be assigned to the same channel and should be assigned to throttle stick, dial, or other non-centering control on the transmitter.

    Below is an example of channel assignment to the Futaba T8FG.

    MODE 5 SC 3 positions switch
    TILT 2 J2 Speed mode
    ROLL 4 T4 Angle mode
    PAN 1 J1 Speed mode
  • 30. JR/SPEKTRUM Settings
    JR/SPECKTRUM SATELLITE Receiver Connection

    Connect satellite receiver to the JR port on the Hyper quick release as shown in the picture. Make sure satellite receiver is already bound to the transmitter (RED led is solid).

    Channel Setting

    Choose 10 bit or 11 bit type resolution on the software and assign proper channels as per SBUS settings.

  • 31. Upgrading Firmware

    Only USB connection allows upgrading firmware. Refer to Section “01. GETTING STARTED” for USB connection.

    Make sure Silab USB driver is already installed. The driver can be found at: -> supports -> product support -> GREMSY S1

    How To Upgrade
    • 01 - Power on the GREMSY S1.
    • 02 - Connect USB cable from GREMSY S1 controller to Mac/PC.
    • 03 - Run the gTune Desktop software.
    • 04 - In the software, select “Serial” option on “connection” tab.
    • 05 - Select the port in the list.
    • 06 - Click on the “Connect” button.
    • 07 - Go to “Upgrade” tab.
    • 08 - “Browse” to firmware file from your computer.
    • 09 - Make sure the RF receiver (if available) is already removed.
    • 10 - Click “Upgrade” button. The process will take about 2 minutes. When the firmware is upgraded successfully, the S1 will be restarted automatically.
  • 32. TroubleShooting
    Status LED is blinking red Low battery Recharge battery
    Status LED is solid red during startup Camera is not balanced well or not installed Check camera balancing
    IMU cable is loose Check in software for IMU sensor error, re-seat IMU sensor connector
    Tilt motor cable or encoder cable is loose Check in software for Tilt error, re-seat tilt motor connector and encoder connector
    Roll motor cable or encoder cable is loose Check in software for Roll error, re-connect roll motor connector and encoder cable
    Pan motor cable or encoder cable is loose Check in software for Pan error, re-connect pan motor connector and encoder cable
    Status LED is solid red during operation IMU sensor cable is loose Re-seat IMU sensor connector
    Status LED is solid white after start up Excessive gyro drift Re-calibrate
    Gremsy S1 has oscillation in one or more axes Stiffness setting is too high Reduce stiffness
    Thumbscrew/top bar nut is not tightened Check tightening
    Camera mounting is not stiff enough Check camera mounting
    Filters settings are incorrect: Gyro and output filter should only be changed if other methods of reducing oscillation have failed Please read more in manual about Gyro filter and output filter (Advanced settings)
    Gremsy gimbal seems to be drifting Gyro sensor is drifting too much Re-calibrate gyro
    Motors seem to be weak Stiffness is too low Increase stiffness
    Auto-power adjustment is not enabled Check in Expert menu if Auto-power adjustment is enabled or not
    Footage appears to wobble side to side or up and down Camera is not properly balanced Check camera balance
    Stiffness setting is low Increase stiffness settings, start with the axis which is poorly stabilized. Higher Stiffness will achieve better stabilization. The tuning process is described in the user manual.