I have similar problem and I dont get access to gsm network. Reason is bad network, because I have problems with my samsung phone in this area.
Anyway, I tested my gsm shield as far as I could, until I go home, where network will be much better.
To check will SIM work run next AT command :
at+cpin ...
Search found 6 matches
- Tue Aug 12, 2014 6:25 am
- Forum: Open Hardware
- Topic: GPRS Shield does not work
- Replies: 26
- Views: 49336
- Mon Aug 11, 2014 1:41 am
- Forum: Open Hardware
- Topic: Arduino GPRS Shield SIM900 not working by software
- Replies: 11
- Views: 81270
Re: Arduino GPRS Shield SIM900 not working by software
I found my problem. GSM Shield wasn't used fixed baud rate. It was set to use auto-baud rate and that's why it wasn't answer as I expected. Baud speed syncronate wasn't get up and I too fast expected that my shield was broken.
AT+IPR=?
+IPR: (),(0,1200,2400,4800,9600,19200,38400,57600,115200)
OK ...
AT+IPR=?
+IPR: (),(0,1200,2400,4800,9600,19200,38400,57600,115200)
OK ...
- Wed Jul 30, 2014 6:07 am
- Forum: Open Hardware
- Topic: Arduino GPRS Shield SIM900 not working by software
- Replies: 11
- Views: 81270
Re: Arduino GPRS Shield SIM900 not working by software
I understand what you mean. Now I have hunted problem and software port D7/8 are between arduino and GSM shield. Serial port D0/1 are only used for debug.
With this code I found that some reason I have GSM shield where baud rate dont stay in same speed.
#include <SoftwareSerial.h>
SoftwareSerial ...
With this code I found that some reason I have GSM shield where baud rate dont stay in same speed.
#include <SoftwareSerial.h>
SoftwareSerial ...
- Tue Jul 29, 2014 11:28 pm
- Forum: Open Hardware
- Topic: Arduino GPRS Shield SIM900 not working by software
- Replies: 11
- Views: 81270
Re: Arduino GPRS Shield SIM900 not working by software
It seems that baud rate of GSM shield v1 changing by it self or GSM shield cant keep it right. Next thread I told that I hunted baud rate to get OK from shield. Next time rate wasn't always same.
http://www.geeetech.com/forum/viewtopic.php?f=16&t=15855&p=20549#p20549
I must say that I am ...
http://www.geeetech.com/forum/viewtopic.php?f=16&t=15855&p=20549#p20549
I must say that I am ...
- Sun Jul 27, 2014 1:01 am
- Forum: Open Hardware
- Topic: GPRS shield not responding to AT commands
- Replies: 7
- Views: 19968
Re: GPRS shield not responding to AT commands
I have similar problem, but I get response for AT. Only by testing different baud rates. Some reason speed of shield changing by itself or what happens?
I used this code for hunting right baud rate. Do I have problem with power or shield?
#include <SoftwareSerial.h>
SoftwareSerial SIM900(7, 8 ...
I used this code for hunting right baud rate. Do I have problem with power or shield?
#include <SoftwareSerial.h>
SoftwareSerial SIM900(7, 8 ...
- Tue Jul 22, 2014 7:48 pm
- Forum: Open Hardware
- Topic: Arduino GPRS Shield SIM900 not working by software
- Replies: 11
- Views: 81270
Re: Arduino GPRS Shield SIM900 not working by software
Old post, but I found it worth of nothing and I want to open questions why JP need to weld? That JP is used only for get D9 to working to start and shutdown GPRS Shield by arduino
Software Triger; If use this way to power up the GPRS Shield, JP need to be soldered, then Digital Pin 9 of the Arduino ...
Software Triger; If use this way to power up the GPRS Shield, JP need to be soldered, then Digital Pin 9 of the Arduino ...