Dear Forumers!
I just bought a new Arduino UNO controller and a new SIM 900 GSM shield.
My problem is, I can't communicate with the SIM 900 via the UNO controller.
I followed this tutorial for wiring. i'm using the Software Serial jumpers and common grounds includes the TX-RX pins as I can read in the tutorial.
The shield successfully connected to the network (The Netlight LED flasing every 3 seconds).
I tried with an USB to TTL converter but nothing response from SIM900. The commands that I use are AT commands like "AT" which will responses "OK" but nothing happens. I've tried lots of baud rates and "Both NL & CR" option selected on the IDE Terminal.
I tried this tutorial but the results is the same as I told :/. No response from the shield.
The shield is dead or I need a firmware upgrade?
Any ideas?
Thanks in advance!
Sorry, this is my shield: SIM900
I don't asked for support from this store, I just buy it. It's not an original arduino product? Which is original? The UNO board is an original Arduino board from this store.
My code:
#include <SoftwareSerial.h>
//Create software serial object to communicate with SIM900
SoftwareSerial mySerial(7, 8); //SIM900 Tx & Rx is connected to Arduino #7 & #8
void setup()
{
//Begin serial communication with Arduino and Arduino IDE (Serial Monitor)
Serial.begin(9600);
//Begin serial communication with Arduino and SIM900
mySerial.begin(9600);
Serial.println("Initializing...");
delay(1000);
mySerial.println("AT"); //Handshaking with SIM900
updateSerial();
mySerial.println("AT+CSQ"); //Signal quality test, value range is 0-31 , 31 is the best
updateSerial();
mySerial.println("AT+CCID"); //Read SIM information to confirm whether the SIM is plugged
updateSerial();
mySerial.println("AT+CREG?"); //Check whether it has registered in the network
updateSerial();
}
void loop()
{
updateSerial();
}
void updateSerial()
{
delay(500);
while (Serial.available())
{
mySerial.write(Serial.read());//Forward what Serial received to Software Serial Port
}
while(mySerial.available())
{
Serial.write(mySerial.read());//Forward what Software Serial received to Serial Port
}
}
My board & wiring link for image):
Serial monitor output (Serial output and picture for link):
Initializing...
image link: Pasteboard - Uploaded Image
As I can see in this picture for using software serial I need to use the D7 and the D8 jumpers. But i tired with D0 and D1 and nothing happens.
If I place the shield to the top of the Arduino UNO I need to switch the EXTN PWR switch to off on the GSM shield right?
