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IMPLEMENTASI SMS BROADCAST DI GEREJA UNIVERSITAS ADVENT INDONESIA MENGGUNAKAN MIKROKONTROLER AT 89551

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ABSTRACT In this study, is elaborated on tlu design of Message Gatewcy wing microcortroller AT89S51 is programmed in C languoge rystem is connected to a GSM modem that serves as a receiver and sender of the message sent by the admin number. Fmm the results that hsve been tried, lhen aty number of admin to send a message to the GSM modem, the microcontroller will send back to the numbers in the daabase. So thot all trumbers in the database wtll receive the sane message. In programming Message Gateway is also found wrys to program the various mem$ that are on display. The system is connected to all the tools, to enler the ddta dircctly from the kcyboard is also provided" making it easier for users to use this tool. And to edit the trumbers in the database can also be dorc directly from the keyboard. Of all is easy because many functions and applications ore added in this study, such as the disploy function that will disploy all the dala input process, editing data, and incoming message. From the results of this test message Gateway, there is a conclusion tha GSM mofum can receive messages and send them back to all the nwnbers that are in the database of GSM modem will wait longer after the completion of processing the incoming message that hos been efiered. Keywords: Modem GSM, Display, AT89551, Microcontroller.