Monitoring of environmental parameters in the COMPASS experiment

The detector control and monitoring systems (DCS) provide a user interface to control the majority of the hardware parameters of the COMPASS apparatus and ensure that the quality of COMPASS data stays at a high level during data taking. The DCS architecture is composed of three layers. The supervisory layer provides the graphical user interface for accessing and monitoring the hardware parameters. The front-ends layer include the various software drivers specific for each hardware element. It provides the supervisory layer with a common communication interface to access the hardware. The hardware elements (crates, sensors, gas systems, etc.) form the devices layer. The goals of the project were: 1) to add some new sensors connected via Raspberry Pi microcontroller boards installed either in the detector or in the gallery near it to the devices layer, program them in the needed way, embed them the supervisory layer using client/server approach; 2) to compare the performance of different types and brands of sensors and to show, which can be suitable for the precise environmental monitoring as well as for the running in radiation conditions.