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contoh yg pernah saya coba dan berhasil, semoga membantu:
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#include <SoftwareSerial.h>
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SoftwareSerial mySerial(3,4); // RX=3, TX=4
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void setup() {
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    mySerial.begin(9600);
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//test kirim SMS pake modem wavecom fastrac
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    mySerial.println("at+cmgs=089630423432");
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    mySerial.write(13);
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    delay(1000);
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    mySerial.println(mssg);
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    mySerial.write(26);
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}
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void loop
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{
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}