FAQ
Frequently asked questions across Juxi Technology products, organized by category.
Robot Arms · SO-ARM101
Q: Robot arm port not detected?
A: Run lerobot-find-port to find the port. Confirm USB connections — leader/follower arms on their respective ports. On Linux, grant serial permissions: sudo chmod 666 /dev/ttyACM*.
Q: Getting Could not connect on port "/dev/ttyACM0"?
A: Verify /dev/ttyACM* exists and permissions are granted, then retry.
Q: Magnitude 30841 exceeds 2047 during calibration?
A: Power-cycle the robot arm and try calibrating again.
Q: Servo error ConnectionError: Failed to sync read 'Present_Position' on ids=[1,...,6]?
A: Check that the arm for that port is powered and the bus servos are connected properly.
Q: Motor 'gripper' was not found?
A: Check servo communication cables and supply voltage.
Q: GPU unavailable with PyTorch?
A: See PyTorch Compatibility Issues on Jetson Orin.
Sensors · IMU Module
Q: IMU data drifts badly?
A: Run full calibration first; confirm the module is firmly mounted; add temperature calibration for large thermal changes.
Q: Magnetometer readings off?
A: Run magnetometer calibration — slowly rotate through all orientations during the process, away from motors and magnets.
Q: No data in ROS topics?
A: Check serial permissions (sudo chmod 666 /dev/ttyUSB*) and port parameters in your launch file.
Accessories · KWS Speech Recognition
Q: Voice module not responding?
A: Confirm factory firmware is flashed. Unflashed chips need burning first — see Firmware Download & Burn.
Q: No data from serial communication?
A: Verify baud rate matches the tutorial and wiring is correct (RX/TX crossed).
Accessories · Heart Rate & SpO2
Q: Initialization fails (init fail)?
A: Check wiring: I2C address default 0x57; UART baud 9600.
Q: Unstable readings?
A: Ensure good sensor-skin contact; keep the finger still.
Accessories · USB / CSI Cameras
Q: Camera not detected?
A: Check USB cable and ports; run ls /dev/video* and v4l2-ctl --list-devices.
Q: CSI camera not recognized?
A: Check the ribbon cable orientation (metal contacts facing the board), connect only while powered off; verify JetPack ≥ 5.0.
Q: GStreamer pipeline error?
A: Confirm JetPack ≥ 5.0; check apt list --installed | grep nvarguscamerasrc.
Accessories · Others
Q: 4K HDMI capture shows black screen?
A: Verify the HDMI interface type (HDMI/Micro HDMI/DP adapter) and use the right converter.
Q: OLED screen not lighting up?
A: Check I2C wiring (SCL/SDA); pin shorts can damage the host board.
Q: USB sound card not detected?
A: Plug-and-play device; verify USB power; switch the default audio output device.
Q: 2-DOF gimbal servos not responding?
A: Check servo power supply (SCS servos need external 6-8.4V).
General
Q: Feishu links in tutorials won't open?A: Feishu docs are internal/collaborator-only. Prefer this wiki, or contact support@juxitech.com.
Q: Which platforms are supported?A: PC (Linux/Windows), Jetson, Raspberry Pi — see the "System Requirements" in each tutorial.
Q: How to get support?A: