Scientific paper ID 2153 : 2021/3

Measurement of deformations of construction facilities (dam walls, retaining walls, etc.) and geodynamic processes (landslides, screes, rockslides), in order to timely establish the process of relocation and stability loss as well as taking measures to prevent them, is performed based on data collection and analysis from several types of sensors. For maximum reliability of the obtained results, it is necessary to carefully select the types of sensors and their location on the site.

The article proposes a method for estimating a change in the position of a measuring pole. When a change in his position is registered, it is used as a signal for an unwanted process that has already begun. For this purpose, the inertial measuring module for absolute orientation BNO055 from Bosch was used. In real conditions, the module should be attached to a pole driven deep into the monitored area. To assess the sensitivity and stability of the obtained data from the module, an experimental setup was used, which allows a change in its position through a certain number of angular degrees. BNO055 connects via the I2C interface to the Raspberry Pi platform, where the received data is processed and recorded. The change in body position is estimated by Euler angles or by quaternions obtained directly at the output of the module. In order to fulfill the condition for monitoring the site at several different points, it is possible to connect identical modules to each other via a ZigBee network and to transmit the collected data to the network coordinator. It has a connection to the Internet, thus providing the opportunity for remote monitoring of data from individual modules.