4_1. SmartWatch

Smart Watch handles data detection and transmission.

Smart Watch senses acceleration, Geomagnetism, and gyro sensors on each of the three axes. Because of the lack of hardware performance of smart watches, raw data is compressed into the smartwatch and sent to the smartphone.

However, continuous detection and transmission of sensors in a short period of time cause overload of real-time motion sensing systems. Therefore, we designed new algorithms to reduce data overload. The new algorithm analyses low data from inside and causes motion to determine behaviour and transmits data for approximately 2 seconds from the beginning of the action.

Specifically, only the accelerometers are used for the three types of sensing data and don't store all data. It stores only the latest data value and compares it to the following sensor values. When compared, a variation of the acceleration is extracted and compares with the threshold. If larger than the threshold, transfer data for approximately 2 seconds. But, if not, it remains the latest value and discards the rest of the data.