Sensor hardware
3-axis gyroscope
CORTEX
A product widely used in research—also in this work—is the Eight EMG electrodes with ST 78589 operational amplifier per electrode.Maximum sampling frequency of 200 Hz.9-axes IMU with 3-axis gyroscope, 3-axis accelerometer and 3-axis magnetometer (InvenSense MPU-9150).Freescale Kinetis ARM Cortex M4 120 Mhz MK22FN1M microcontroller.Communication via BLE with Nordic nRF51822 to HM-11 BLE dongle.Vibration motor and LEDs for signalling.Two lithium batteries (3.7 V, 260 mAh), USB-charged.