A touch-free service button for Smart Elevator Operation with dynamic QR-code generationReinsalu, Uljana; Robal, Tarmo2023 12th Mediterranean Conference on Embedded Computing (MECO) : 6-10 June 2023, Budva, Montenegro : proceedings2023 / 4 p. : ill https://doi.org/10.1109/MECO58584.2023.10155102