B. Smart-phone selection
Modern smartphones come with a number of sensor arrays including accelerometers, gyroscopes, temperature, acoustic, pressure, humidity sensors and more. For the purposes of this paper, the chief criterion in choosing a smartphone was clearly the performance of the accelerometer. which is primarily determined by the sampling rate of the sensor. the consistency sensitivity. After reading a number of research blogs and performing limited experiments with a number of smartphone models, we have chosen the Samsung Galaxy S4 phone for experiments. since its sensitivity. sampling rate. consistency and processing power were among the best Critical specs of the S4 smartphone are shown in Table II