*2.1. Data Acquisition*

The data registered for the gait analysis consists of a set of pressure measures obtained through a footwear insole connected to an embedded device. After an in depth study of the walking process and the more adequate distribution of the sensors tested on previous works [21,22], seven FSRs are disposed in different parts of the foot. For each footstep, sensors samples at 50 hertz frequency since the first contact of the foot with the ground until the moment the foot is lifted. Thus, the information stored refers to the medium pressure received by each sensor during each step. These values are normalized after each step ends using the sensor's value with the highest pressure received as 100% pressure and modifying the other sensors' values to a percentage value relative to that sensor.

Next, both the footwear insole and the dataset obtained after the acquisition phase are detailed.
