Faisol Hidayat, M.; Indrianto Sudjoko, R.; Junipitoyo, B. PROTOTYPE OF CONTROL AND MONITORING OF LAMP CONDITION, LUMEN AND BOX ANGLE PRECISION APPROACH PATH INDICATOR (PAPI) BASED ON GSM. Int. Conf. Adv. Transp. Eng. Appl. Soc. Sci. 2023, 2, 592-596.