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The Belle II experiment is presently in phase-2 operation at the SuperKEKBelectron-positron collider in KEK (Tsukuba, Japan). The detector is an upgradeof the Belle experiment at the KEKB collider and it is optimized for the studyof rare B decays, being also sensitive to signals of New Physics beyond theStandard Model. The Electromagnetic Calorimeter (ECL) is based on CsI(Tl)scintillation crystals. It splits in a barrel and two annular end-cap regions,these latter named Forward and Backward, according to the asymmetric design ofthe collider. CsI(Tl) crystals deliver a high light output at an affordablecost, however their yield changes with temperature and can be permanentlydamaged by humidity, due to the strong chemical affinity for moisture. Each ECLregion is then equipped with thermistors and humidity probes to monitorenvironmental data. While sensors and cabling have been inherited from theoriginal Belle design, the ECL monitoring system has been fully redesigned. Inthis paper, we present hardware and software architecture deployed for the 2112CsI(Tl) crystals arranged in the Forward and Backward end-caps. Single-BoardComputers (SBCs) have been designed ad-hoc for embedded applications. Forsensor read-out, a data-acquisition system based on 24-bit ADCs with localprocessing capability has been realized and interfaced with the SBCs. EPICSapplications send data across the Local Area Network for remote control anddisplay.

The Monitoring System of the End-Cap Calorimeter in the Belle II experiment