Assalamu’alaikum Wr. WB

kali ini saya akan menjelaskan

tentang tata cara pembuatan

jam digital pada aplikasi java eclipse

saya sangat berharap postingan  ini

dapat berguna dalam rangka

menambah wawasan serta pengetahuan

pertama alat alat yang digunakan

1. arduino uno v3.0

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2. gsm module SIM900A

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3. 4 kabel jamper

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4. 1 led

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5. 1 kabel penghubung serial port

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6. 1 buah kartu gsm

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dibawah ini adalah foto rangkainyannya

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keterangan :

• kabel warna hijau  (Arduino pin  02  —->GSM Module 5VT  )
• kabel warna putih (Arduino pin 03 ——>GSM Module  5VR )
• kabel warna hitam (Arduino GND —–>GSM Module GND )
• kabel warna hitam  (Arduino 5V ——> GSM Module  VCC5  )
• led  (led negatif –>GND)
• led  (led positih –>pin13)

dan di bawah ini code arduino

/*
SMS sender

This sketch, for the Arduino GSM shield,sends an SMS message
you enter in the serial monitor. Connect your Arduino with the
GSM shield and SIM card, open the serial monitor, and wait for
the "READY" message to appear in the monitor. Next, type a
message to send and press "return". Make sure the serial
monitor is set to send a newline when you press return.

Circuit:
* GSM shield
* SIM card that can send SMS

created 25 Feb 2012
by Tom Igoe

This example is in the public domain.

http://www.arduino.cc/en/Tutorial/GSMExamplesSendSMS

*/

// Include the GSM library
#include <GSM.h>

#define PINNUMBER ""
#define pinReady 13
#define pinSend 12

String strTampung;
String mantap = "08xxxxxxxxxx";//sesuaikan dengan nomer yang mau dituju
int LED_one = 13;
// initialize the library instance
GSM gsmAccess;
GSM_SMS sms;
char txtMsg[200]="bisa ko...";
void setup() {
pinMode(pinReady, OUTPUT);
pinMode(pinSend, OUTPUT);
// initialize serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}

Serial.println("SMS Messages Sender");

// connection state
boolean notConnected = true;

// Start GSM shield
// If your SIM has PIN, pass it as a parameter of begin() in quotes
while (notConnected) {
if (gsmAccess.begin(PINNUMBER) == GSM_READY) {
notConnected = false;
} else {
Serial.println("Not connected");
delay(1000);
}
}

Serial.println("GSM initialized");
digitalWrite(pinReady, HIGH);
}

void loop() {

/*

digitalWrite(pinSend, HIGH);
//Serial.print("Enter a mobile number: ");
char remoteNum[20]; // telephone number to send sms
readSerial(remoteNum);
//Serial.println(remoteNum);
*/

// sms text
/*Serial.print("Now, enter SMS content: ");
char txtMsg[200];
readSerial(txtMsg);
Serial.println("SENDING");
Serial.println();
Serial.println("Message:");
Serial.println(txtMsg);
*/

/*
// send the message
digitalWrite(pinSend, LOW);
sms.beginSMS(remoteNum);
sms.print(txtMsg);
sms.endSMS();
Serial.println("\nCOMPLETE!\n");
*/

while (Serial.available()) {
char charSerial = Serial.read();
delay(10);

// ini berarti enter
if (charSerial == '\n') {
// Serial.println("n");
break;
} //ini karakter karakter apa gitu
else if (charSerial == '\r') {
// Serial.println("r");
}
else {
// Serial.println("tambahkan");
strTampung += charSerial;
}
}

if (strTampung.length() > 0) {
Serial.println(strTampung);
if (strTampung == mantap) {
digitalWrite(pinSend, HIGH );
//Serial.println("ini yg dicari");
// send the message
char remoteNum[20]; // telephone number to send sms
strTampung.toCharArray(remoteNum, 20);
sms.beginSMS(remoteNum);
sms.print(txtMsg);
sms.endSMS();
Serial.println("\nCOMPLETE!\n");

digitalWrite( pinSend, LOW );
} else {

}
strTampung="";
}
}

/*
Read input serial
*/
int readSerial(char result[]) {
int i = 0;
while (1) {
while (Serial.available() > 0) {
char inChar = Serial.read();
if ((inChar == '\n') || (inChar == '#')) {
result[i] = '\0';
Serial.flush();
return 0;
}
if (inChar != '\r') {
result[i] = inChar;
i++;
}
}
}
}

Jika Ingin Lebih jelas nya anda bisa melihat video demo berikut :