Movella DOT User Manual

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Document XD0502P, Revision A, July 2023

Movella DOT

User Manual

www.movella.com

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Page 1 Document XD0502P, Revision A, July 2023 Movella DOT User Manual www.movella.com...
Page 2 July 2023 Movella DOT rebranding. Update the battery specifications. Update the charger specifications. © 2021-2023, Movella Inc. All rights reserved. Information in this document is subject to change without notice. All other trademarks are the property of their respective owners. www.movella.com...
Page 3: Table Of Contents
Long-term storage guidelines......................13 Troubleshooting ............................ 14 Movella DOT Overview ....................15 Strapdown integration .......................... 15 Sensor fusion algorithm and filter profiles .................... 15 Movella DOT sensor state transition ..................... 16 3.3.1 Power ON ............................16 3.3.2 Power OFF ............................. 17 3.3.3...
Page 4 Charger specifications ........................... 27 Sensor components specifications ......................28 Battery specifications ..........................28 Sensor technical drawing ........................30 Charger technical drawing ........................31 Important Notices .....................32 Warranty and Liability ........................... 32 Customer Support ..........................32 Product Compliance ..........................33 www.movella.com...
Page 5 Table 19: Alignment specifications ................... 28 Table 20: Battery Specifications ..................29 List of Figures Figure 1: Movella DOT sensors with a charger ................ 6 Figure 2: Movella DOT set ....................7 Figure 3: Movella DOT sensor ..................7 Figure 4: Charger with power cable ................... 9 Figure 5: Mag Norm is constant while moving ...............
Page 6: Introduction
3D orientation as well as calibrated 3D linear acceleration, angular velocity and (earth) magnetic field data to a receiving device. Xsens DOT is the start of a new Xsens product line bringing Xsens sensor solutions to mobile device platforms. With simple-to-use Software-Development-Kit (SDK) and comprehensive documentation, system integrators can easily develop their wearable applications.
Page 7: Getting Started
Figure 2: Movella DOT set The easiest way to get started with Movella DOT is to use the Movella DOT app (Android/iOS) to connect the sensors. You can get to know the capabilities of Movella DOT and to configure the sensor according to your needs.
Page 8: Activate Sensor
Activate sensor When using the DOT sensors for the first time, you need to activate the sensors by connecting them to a powered USB cable. You can directly connect to the micro-USB port at the bottom of the sensor, or place multiple sensors in the charger and then connect the charger.
Page 9: Reset Sensor
Each docking slot features an embedded micro-USB port. Sensors can be charged by plugging them into the respective slots. Another micro-USB port placed on the right side of the Movella DOT charger is used to power on and charge all the sensors docked in the charger. To power this micro-USB port, an adapter of 5V/300mA is enough but we would recommend using a 5V/500mA adapter (5 sensor loads) based on standard USB 2.0 power...
Page 10: Supported Platforms
• If you are a developer or system integrator wanting to build your own applications, download Movella DOT Software Development Kit (SDK) for Android, iOS and PC-based applications. Download the SDK, check out the well-written documentation and example code to get started.
Page 11: Tips For Best Practice
The magnetometer in Movella DOT sensors is used as a 3D compass to determine the direction of the Earth true north (heading or yaw) and is used as an absolute reference in the calculation of 3D orientation. For detailed information about the influence of magnetic field on orientation, see the PhD thesis “Inertial and magnetic sensing of human movement near...
Page 12: Drift In Orientation Data
If the magnetic field norm has large fluctuations, or the Movella DOT sensor is attached to an instrument or prosthesis that influences the magnetic field (e.g. ferromagnetic object), it is best to carry out Magnetic Field Mapping (MFM) for this DOT (see section 3.4) to recalibrate the magnetometer.
Page 13: Long-Term Storage Guidelines
2. After charging, disconnect the sensors from charger, and make sure the sensors are powered off before storing. To turn off the sensors, press and hold the button for 3 seconds or use the Movella DOT app. The LED will turn solid green for 1 second and then fade out, indicating that the sensor has been properly powered off.
Page 14: Troubleshooting
LED is back to normal. If not, please try to reset the 10 seconds, indicating overheat during charging sensor. If the solution does not work for you, please contact our customer support. Customer support contact information can be found in section 6.2. www.movella.com...
Page 15: Movella Dot Overview
3 Movella DOT Overview The signal processing architecture of Movella DOT sensor is presented in Figure 7. The strap down integration (SDI) and sensor fusion algorithms (XKFCore) are integrated into the firmware. You can obtain the orientation increments and velocity increments from SDI, as well as the 3D orientation and free acceleration from XKFCore.
Page 16: Movella Dot Sensor State Transition
Typical applications are when sensors are applied on subjects for sports such as sprinting. 3.3 Movella DOT sensor state transition Figure 8: Movella DOT state transition diagram 3.3.1 Power ON You can power on the sensor by pressing the power button for 2 seconds. Sensor will go to advertisement mode after powered on.
Page 17: Power Off
You can change this setting via Movella DOT app (v2021.0 or above) or the SDK (v2021.0 or above). By enabling USB power on, the sensor will power on immediately after the USB plugin. With this feature, you can power on multiple sensors with the USB plugin at once.
Page 18: Measurement
To achieve a better synchronization result, it is advised to put the root node in a central position of all the scanners. In Movella DOT app, the first connected sensor will be the root node. SDK users and other developers can set their own rules to choose the root node.
Page 19 High fidelity mode is available in real-time streaming. In this mode, Movella proprietary data format will be transmitted via Bluetooth and parsed in Movella DOT app or SDK. The advantage of this mode is that even in the case of transient data loss, higher frequency (800 Hz) information is still preserved with lower output data rate (60 Hz).
Page 20: Power Saving
The default time thresholds to enter power saving mode is set to 10 min in advertisement mode and 30 min in connection mode. Power saving mode can be disabled and the time thresholds can be adjusted in Movella DOT app, SDK or by BLE services.
Page 21: When To Perform Mfm
3.4.1 When to perform MFM To obtain the accurate measurement data, when using DOT for the first time, please do an MFM in the environment where the measurement is to be performed. If you observe objects such as metals or motors in the environment, refer to section 2.6.2 to confirm the existence of magnetic interference and perform MFM if necessary.
Page 22: Firmware Downgrade
Starting with firmware version 2.4.0, it is possible to reset the sensors to factory settings. The factory settings are the default values that DOT devices are shipped with. Note that recording data will not be cleared. The reset to factory setting feature includes the following operations: •...
Page 23: Output Specifications
5.4. The orientation calculated by Movella DOT is the orientation of the sensor coordinate system (S) with respect to the local earth coordinate system (L). Movella DOT can output a North referenced Yaw, also referred to as Heading.
Page 24: Heading Reset
The reset orientation is maintained between measurement start/stop and connection/disconnection but will be lost after a device reboot. The heading reset can be performed in Movella DOT app and is available in SDK. Follow these steps to do the heading reset in app: 1.
Page 25: Calibrated Delta_Q And Delta_V
This output is coning- and sculling compensated strap down integrated data in the sensor coordinate system (S). Delta_q and Delta_v values represent the orientation change and velocity change during a certain interval. For Movella DOT, this interval is 16.67 ms (60 Hz) by default. Table 8: Delta_q and Delta_v outputs...
Page 26: Free Acceleration
Free acceleration 4.2.5 Timestamp and packet counter Each data message from Movella DOT is accompanied by a packet counter and a timestamp. 1.1.1.4 Packet Counter Packet counter starts with every new measurement and increase with every generated data message. This value wraps at 0xFFFFFFFF.
Page 27: Physical Specifications
5 Physical Specifications 5.1 Sensor specifications The specifications apply to Movella DOT v2. Table 13: Movella DOT sensor specifications Physical Properties Attachment Application dependant, straps available by Movella (sold separately) Latency 30 ms Battery life Around 8 hours in continuous measurement Weight 11.2 g...
Page 28: Sensor Components Specifications
[°] 0.05 Alignment (gyr to acc) [°] 0.05 Alignment (mag to acc) [°] Alignment of acc to the module board [°] Non-orthogonality (accelerometer) [°] 0.05 5.4 Battery specifications LIR2032H rechargeable coin battery is used in the Movella DOT v2. www.movella.com...
Page 29: Table 20: Battery Specifications
Table 20: Battery Specifications Parameter Value Nominal 70 mAh Capacity Minimum 65 mAh Nominal Voltage 3.7V www.movella.com...
Page 30: Sensor Technical Drawing
5.5 Sensor technical drawing Figure 14: Sensor technical drawing www.movella.com...
Page 31: Charger Technical Drawing
5.6 Charger technical drawing Figure 15: Charger technical drawing www.movella.com...
Page 32: Important Notices
6.2 Customer Support Movella is glad to help you with any questions you may have about the Movella DOT, or about the use of the technology for your application. The fastest way is Movella’ Help Centre, where engineers and other Movella users meet.
Page 33: Product Compliance
Radio Equipment (ordinance of MPT N°. 37, 1981), Article 2, Paragraph 1: Item 19 "2.4 GHz band wideband low power data communication system". 1.1.1.9 NCC Taiwan compliance The ANNA-B112 module complies with the NCC Taiwan compliance. Find more detailed information on Movella DOT certification here. www.movella.com...

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