Important changes to forums and questions
All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.
10 years, 2 months ago.
send SMS with SIM 900
Hi to all, i use a Sim900 of SimCOM if i sand AT command or other commands all work well, but i have a problem for sand a SMS i write this code
#include "mbed.h"
#include <string>
Serial pc(SERIAL_TX, SERIAL_RX); // pc comunication
Serial SIM900(PA_9, PA_10); //tx, rx SIM 900
string result;
char x;
void power()
{
sim_power.write(1); // accension gsm
wait(1);
sim_power.write(0);
wait(13);
SIM900.printf("ATE0\r\n"); // DISABLE ECHO
wait(1);
}
void clearString()
{
result.clear();
}
void callback_rx() {
while (SIM900.readable()) {
x = SIM900.getc();
result += x;
pc.putc(x); // print the answer from SIM900
}
}
void sendSMS()
{
clearString();
SIM900.printf("AT+CMGF=1\r"); //at command for send sms
wait_ms(100);
clearString();
wait_ms(100);
SIM900.printf("AT+CMGS=");
SIM900.putc('"');
SIM900.printf("+32292*******");
SIM900.putc('"');
SIM900.printf("\r");
SIM900.printf("Example Message SMS");
SIM900.putc(0x1A);
wait_ms(20000);
}
int main() {
power();
pc.printf("\r\n GSM 900 TEST\n");
SIM900.attach(&callback_rx);
SIM900.baud(9600); //
wait_ms(100);
while(1) {
wait_ms(10);
sendSMS(); // SEND SMS
wait_ms(100);
}
}
i see this when i send the sms but i have this strange message: AT+CMGF=1AT+CMGS="+32292*"" Example Message SMS
i see that the system send the message later two loop, i don't know where is the error can you help me?
best regards. A.
4 Answers
7 years, 7 months ago.
Hello I try this project just difference I use sim908c and I do not understand how I do hardware connection if you know please help me
10 years ago.
You should use more time between AT commands. eg.
GSM
#include "mbed.h"
#include <string>
Serial pc(SERIAL_TX, SERIAL_RX); // pc comunication
Serial SIM900(PA_11, PA_12); //tx, rx SIM 900
string result;
char x;
void clearString()
{
result.clear();
}
void callback_rx() {
while (SIM900.readable()) {
x = SIM900.getc();
result += x;
pc.putc(x); // print the answer from SIM900
}
}
void sendSMS()
{
clearString();
SIM900.printf("AT+CMGF=1\r"); //at command for send sms
wait_ms(1000);
clearString();
wait_ms(1000);
SIM900.printf("AT+CMGS=");
SIM900.putc('"');
SIM900.printf("+48*********");
SIM900.putc('"');
SIM900.printf("\r");
wait_ms(1000);
SIM900.printf("test1");
wait_ms(1000);
SIM900.putc(0x1A);
wait_ms(5000);
}
int main() {
pc.printf("\r\n GSM 900 TEST\n");
SIM900.attach(&callback_rx);
SIM900.baud(9600); //
wait_ms(100);
while(1) {
wait_ms(10);
sendSMS(); // SEND SMS
wait_ms(100);
}
}
8 years, 6 months ago.
i am also getting same issue, not able o send sms please help
Thanks Gautam
You have not declared variable x in callback_rx
posted by Rushabh Shah 01 Nov 2014sorry, i declare char x;
posted by Antoniolinux B. 18 Nov 2014