Notches are small devices that can form a wireless sensor network of 2 and more nodes. Each module is equipped with 3 high-accuracy MEMS sensors, including an accelerometer, a gyroscope, and a compass. Onboard memory allows to motion capture without a constant smartphone connection. Notches use Bluetooth Low Energy to communicate with the smartphone.
Sensor Specification
| Range | |
|---|---|
| Gyroscope | ±250, ±500, ±1000, ±2000, ±4000 dps |
| Accelerometer | ±2, ±4, ±8, ±16, ±32 g |
| Magnetometer | ±4/ ±8/ ±12/ ±16 gauss |
| Sampling frequency | 5Hz, 10Hz, 20Hz, 40Hz, 50Hz, 100Hz, 125Hz, 200Hz, 333Hz, 500Hz |
Note on the precision Properly calibrated Notch devices static accuracy is about 1-2В° yaw/pitch/roll. The precision of the whole system depends on the number of parameters - correct steady pose, the tight fit of sensors throughout the measurements, and the possibility of magnetic interference from the environment. Our algorithms account for biomechanics and sensor errors, but sensor drift may accumulate over time during the recording session. If you have a specific activity in mind that has some particular precision requirements - let us know - we would be happy to answer your questions.
Memory
Notches allow recording data on the onboard FLASH memory.
| Sample Rate | Capacity |
|---|---|
| 50Hz | 130min |
| 500Hz | 13min |
Communication
Notches use BLE (Bluetooth Low-Energy) to communicate with the target smartphone. Notches also form a propriety, wireless sensor-network synchronicity, and internal communication.
| Network configuration | Number of modules | Max Sample Rate |
|---|---|---|
| Real-Time | 1-2 | 100Hz |
| 3-6 | 40Hz | |
| Non-Real-Time | 18+ | 500Hz |
Battery Life
Notches run on rechargeable, Li-Po batteries. It takes about 1 hour to charge your devices under sufficient power (>500mAh). During charging, the notch blinks green - when the battery is close to full, the device shines green. We recommend unplugging the dock after more than 2 hours of charging.
| Battery Life | Duration |
|---|---|
| Active Mode | 6+ hours |
| Passive Mode | 300+ hours |
| Charging Time | 1 hour |
Hardware Interfaces
| Switch | State | Options |
|---|---|---|
| Power On, Power Off, Firmware Mode | Optional User Input |
| LED | Description | Options |
|---|---|---|
| RGB LED | Access to RGB LED |
