UDCAP VR Gloves FAQs

1. Unable to Connect UDCAP VR Gloves

Please refer to the [Firmware Update & Channel Switching] section. The gloves need to be re-paired.

Firmware Update & Channel Switching

2. Glove Lag or Significant Input Delay

1. Switch to a channel with less interference. You can view channel signal strength in the switching interface. For details, see the [Firmware Update & Channel Switching] section. Ensure that the left and right gloves are set to different channels.

2. Use an extension cable to keep the signal receiver at least 60cm away from the computer case.

Note: Actions that severely affect signal strength:

a. If you're using multiple receivers on a USB HUB, make sure the HUB is externally powered and provides stable voltage to each USB port.

b. Too many 2.4GHz Wi-Fi signals nearby can cause interference.

3. SteamVR Glove Icon Stays Grey (Cannot Connect)

• If you're using a Pico or Quest headset, run Udcap_overlay.exe.

show in [Meta Quest Headsets]or[PICO:Controller Tracking Plan Setting]

Note: udcap_overlay.exe must match the privilege level of UDCAP, Steam, and SteamVR.

• If you're using Lighthouse tracking, make sure your trackers (e.g. Vive Tracker 3.0) are set to “held in hand” and assigned to left/right hand.

show in Lighthouse Tracking Plan

• If you use Tundra Tracker for hand spatial positioning, the SteamVR glove icon appears gray and fails to connect. SteamVR - Settings - Developer - Legacy Settings - REMOVE ALL STEAMVR USB DEVICES and restart the computer.

4. No Vibration in Games (e.g. VRChat Has No Vibration)

Vibration Feedback: Issues and Corresponding Solutions

5. Joystick Direction is Inverted (Up/Down, Left/Right Reversed)

Joystick connection cable is installed incorrectly. Make sure the UDCAP logo is facing the same direction (either both facing up or both down).

show in [Peripheral Installation Guide]

6. Joystick Drift

Recalibrate the joystick. For details, see the [Software Features → Joystick Calibration] section.

7. How to recalibrate the joystick direction when the glove's joystick module misaligns due to finger bending?

When the index finger is naturally bent, pushing the joystick left may result in an upward/downward force angle, causing non-pure horizontal input detection.

Solution: SteamVR Joystick Calibration Steps​

1. ​Access Calibration Interface:

   • Launch SteamVR and ensure the controller is connected.

   • Navigate to ​SteamVR → "Settings" → "Controllers" → "Edit THUMBSTICK Settings".

   
2. ​**Adjust Finger Posture:**​

   • Wear the glove normally and position the index finger in its ​common operating posture​ (e.g., slightly bent to mimic in-game usage).

3. ​**Calibrate Joystick Direction:**​

   • Select the controller to calibrate (Left/Right).

   • ​Hold the trigger button​ to enter calibration mode.

   • Follow prompts to push the joystick toward your perceived ​**"true upward"**​ direction at least 5 times (maintain consistent force direction).

8. My Other Device (Controller) Frequently Conflicts with the Gloves

Go to UDCAP → Settings and set the Controller Priority to [HIGH].

9. How Can I Modify Button Mappings?

Please refer to the 【SteamVR Input Remapping Tutorial】 section.

10. Why Does "Input Dropping" Happen During Rapid Firing in Games Like Half-Life: Alyx, and How to Fix It?

In shooting games like Half-Life: Alyx, the trigger input is analog—meaning the game detects how much the trigger is pressed, not just whether it's pressed or not. It simulates the physical feel of a real trigger pull.

When firing rapidly, if the trigger does not fully return to its initial position after each shot, the game may fail to register the next pull, resulting in missed shots, commonly referred to as "input dropping".

✅ Recommended Solution: We recommend reducing the “Trigger Threshold” in the UDCAP driver settings. Set the trigger activation range (from touch to full press) to within 10%.

This allows each quick press to register with less movement, making the trigger input more responsive and minimizing input loss during rapid firing.

11. Unable to Fully Extend Arms in VRChat

Settings - Open the full settings menu - Tracking & IK - Adjust the Arm vs Height Ratio.

12. VRC model character hand jam, not smooth enough.

1. VRChat - Settings - Controls - Enable "Avatar Use Finger Tracking"

1. VRChat - Settings - Avatar - General Avatar Settings - Disable "Avatar Gestures"

13. Frequent Channel Switching Failures

Cause: Switching commands are lost due to low signal strength or excessive interference on the current channel.

Solution: Move the glove as close as possible to the Wireless Receiver. Only attempt channel switching when the signal strength indicator turns green.

CAUTION: Operations that severely impact signal strength: a. If using a USB hub with multiple Wireless Receivers: → Ensure the hub has dedicated power supply → Verify rated voltage for all USB ports b. Excessive Wi-Fi 2.4GHz signals in the operating environment.

14. The glove cannot connect to the signal receiver.

The power of the glove is on, but the blue light is flashing.

Please open [Firmware Update] - [Pairing] to connect the glove.

15. The firmware update has been failing.

1. Make sure that the udcap software is at the latest version.

2. Connect the PC and the glove using a data cable (please insert the Type-C interface near the little finger).

3. Ensure that your network connection is stable and disable the VPN.

4. Open the root directory of the udcap software (right-click the udcap shortcut - open the location of the file), and find the following three files in the root directory. These are the firmware cache of udcap, delete them.

5. After deletion, restart the software and then update it.

nrf52832_rx_app_update.bin

nrf52840_tx_left_app_update.bin

nrf52840_tx_right_app_update.bin

16. When connecting the gloves to the computer via the data cable, the UDCAP software is unable to read the information of the gloves or the signal receiver.

1. Please confirm your system language settings. This issue occurred because the Udcap Driver software version 0.1.4 had compatibility problems in some language environments. These issues have been resolved in version 0.1.5. Solution: a. Update the Udcap Driver software to the latest version. b. If you still want to use the older version of the software, please switch your system language to English (English), and then you can properly recognize the gloves, update the firmware, and perform the pairing operation.

2. Problem description: The receiver/glove is connected via a wire, but the software fails to recognize it. Open the Device Manager and check the ports.

• Device Manager - Ports (COM and LPT)

Locate the conflicting COM port, right-click on it, select Properties - Port Settings - Advanced - Switch to an unused port. Then reinsert the signal receiver and the glove, and restart the UDCAP software to solve the problem.

17. After starting SteamVR, the SteamVR panel does not display the udcap gloves (nor the gray gloves).

Cause: The UDCAP plugin was not enabled properly. The gray/highlighted icon of the UDCAP VR glove did not appear on the SteamVR panel.

In normal view: When the udcap plugin is normally enabled, without performing any operations, the gray icon of the udcap glove still appears on the SteamVR panel.

Solution:

1. Open SteamVR - Settings - Start/Stop - Manage Add-ons - Make sure the UDCAP add-on is enabled.

1. If the udcap option is already enabled in the add-on, and after restarting SteamVR, the SteamVR panel still fails to display the udcap glove icon, please check if the previously moved udcap file exists in the SteamVR plugin folder and delete it.

18. SteamVR experienced a crash.

If SteamVR crashes, it might be due to compatibility conflicts caused by third-party plugins or extensions. We recommend that you go to the SteamVR settings and try temporarily disabling some plugins to identify the source of the conflict one by one. The currently known conflicts are: 【htc_rr】 and 【smooth tracking】

19. When the two signal receivers were simultaneously inserted into the computer, the UDCAP software only displayed one.

Please re-pair the signal receiver. For details, please refer to:

Firmware Update & Channel Switching