Please help here, i'm working on a small project with Network Shield, Arduino Uno and GSM SIM900a modules.
My goal is very simple, I have an address parameter sent with phone number and type message. Once received, it filters the parameter and send sms.
The code is working IF ONLY CONNECTED via USB, if I want to connect with DC (5v 2A) it wont work and doesn't send any message (sms). I already tried connecting the power directly to the GSM not from Arduino but still the same.
Any help really appreciated. Thanks.
#include <SoftwareSerial.h>
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xED};
const char mobileno[13] = "";
const char txtmessage[30] = "";
EthernetServer server(80);
SoftwareSerial SIM900A(7,8);
String readString = String(30);
char phone[13] = "";
char txt[30] = "";
String mobile_ = "";
String msg_ = "";
String mobile_msg;
String data;
int start;
int ind1; // - locations
int ind2;
String currentLine = "";
String tweet = "";
String current_tweet = "";
boolean readingTweet = false;
void setup()
{
delay(1000);
// GSM
SIM900A.begin(9600);
Serial.begin(9600);
delay(100);
//SIM900A.begin(38400);
Serial.println ("SIM900A Ready");
delay(100);
Serial.println ("Type s to send message or r to receive message");
// ETHERNET
delay(1000);
Ethernet.begin(mac);
delay(500);
server.begin();
delay(500);
Serial.println("Server is at");
Serial.println(Ethernet.localIP());
}
void loop()
{
if (Serial.available()>0){
switch(Serial.read())
{
case 's':
SendMessage("09277324510", "Message here...");
break;
case 'r':
RecieveMessage();
break;
}
}
if (SIM900A.available()>0){
Serial.write(SIM900A.read());
}
// Create a client connection
EthernetClient client = server.available();
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();
//read char by char HTTP request
if (readString.length() < 100) {
//store characters to string
readString += c;
//Serial.print(c);
}
//if HTTP request has ended
if (c == '\n') {
///////////////
Serial.println(readString); //print to serial monitor for debuging
//now output HTML data header
if(readString.indexOf('?') >=0) { //don't send new page
client.println("HTTP/1.1 204 Zoomkat");
client.println();
client.println();
}
else {
client.println("HTTP/1.1 200 OK"); //send new page
client.println("Content-Type: text/html");
client.println();
client.println("<HTML>");
client.println("<HEAD>");
client.println("<TITLE>HOVER - GSM Server</TITLE>");
client.println("</HEAD>");
client.println("<BODY>");
client.println("<H1>GSM</H1>");
client.println("</BODY>");
client.println("</HTML>");
}
delay(1);
//stopping client
client.stop();
///////////////////// control arduino pin
Serial.println("client disconnected.");
Serial.println("Data from server captured in readString:");
Serial.println();
Serial.print(readString); //prints readString to serial monitor
Serial.println();
//parse readString for data
start = readString.indexOf("?phone"); //finds a unique start location
ind1 = readString.indexOf('=', start+2); //finds location of first -
ind2 = readString.indexOf("&d", ind1+1 ); //finds location of second -
data = readString.substring(ind1+1, ind2); //captures data String
Serial.print("my data is: ");
Serial.println(data);
mobile_msg = data;
Serial.println();
int n = data.toInt(); //convert data into a number
Serial.print("my number is: ");
Serial.println(n);
Serial.println();
Serial.println("End of readString");
Serial.println("==================");
Serial.println();
readString=""; //clear readString variable
data=""; //clear data variable
readString="";
// SENDING SMS
mobile_ = mobile_msg.substring(0,11);
mobile_.toCharArray(phone,13);
msg_ = mobile_msg.substring(16,18);
msg_.toCharArray(txt,30);
Serial.println( "------------------" );
Serial.println( "READING TXT: " );
Serial.println( txt );
Serial.println( "------------------" );
//if(txt == "01"){
// SendMessage( phone , "You have a Visitor!" );
//}else{
SendMessage( phone , "Message here..." );
//}
}
}
}
}
}
void SendMessage(char mobile_number[13], char txt_message[100])
{
Serial.println ("Sending Message...");
SIM900A.println("AT+CMGF=1"); //Sets the GSM Module in Text Mode
delay(2000);
Serial.println ("Set SMS Number");
SIM900A.println(String("AT+CMGS=\"") + mobile_number + String("\"\r"));
delay(2000);
Serial.println ("Set SMS Content");
SIM900A.println( txt_message );// Messsage content
delay(2000);
Serial.println ("Finish");
SIM900A.println((char)26);// ASCII code of CTRL+Z
delay(500);
Serial.println ("Message has been sent!");
}
void RecieveMessage()
{
Serial.println ("SIM900A Membaca SMS");
//delay (2000);
SIM900A.println("AT+CNMI=2,2,0,0,0"); // AT Command to receive a live SMS
delay(1000);
Serial.write ("Unread Message done!");
}
