Problem with Arduino and GPRS shield v2

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#1

I have tried a lot to connect Arduino UNO and GPRS shield v2 but it does not work. AT Command Tester & Sscom is not responding (no feedback from gprs for all commands, but I can see my Serial.print()). I have followed each and every instruction from the wiki. but nothing.
Despite this, the green LED works properly when I Power up the SIM900 and I can send my command to arduino.

#2

[size=150]Using GPRS Shield With Mega[/size]

  1. Connect pin-7 to pin-10 (pin-8 to pin-11) by jumper wire
  2. Use this code:
#include <SoftwareSerial.h>
 
SoftwareSerial GPRS(10, 11);
unsigned char buffer[64]; // buffer array for data recieve over serial port
int count = 0;     // counter for buffer array 

void setup()
{
    GPRS.begin(19200);               // the GPRS baud rate   
    Serial.begin(19200);             // the Serial port of Arduino baud rate.
}
 
void loop()
{
    if (GPRS.available())              // if date is comming from softwareserial port ==> data is comming from gprs shield
    {
        while (GPRS.available())          // reading data into char array 
        {
            buffer[count++] = GPRS.read();     // writing data into array
            if (count == 64)
                break;
        }
        Serial.write(buffer, count);            // if no data transmission ends, write buffer to hardware serial port
        clearBufferArray();              // call clearBufferArray function to clear the storaged data from the array
        count = 0;                       // set counter of while loop to zero
    }
    if (Serial.available())            // if data is available on hardwareserial port ==> data is comming from PC or notebook
        GPRS.write(Serial.read());       // write it to the GPRS shield
}

void clearBufferArray()              // function to clear buffer array
{
    for (int i=0; i < count; i++)
    {
        buffer[i] = NULL;
    }                               // clear all index of array with command NULL
}
  1. Go AT command tester describe in product wiki, Connect with 19200 bps
    Note:Don’t forget to plug the jumpers to SWserial mode.
    Good luck!
#3

i’m also encountered the same problem as above. instead using uno, i’m using arduino leonardo. does your code above apply as well to arduino leonardo?

#4

[size=150]Code for leonardo[/size]

Serial 1 hardware~

[code]
#include <SoftwareSerial.h>

unsigned char buffer[64]; // buffer array for data recieve over serial port
int count = 0; // counter for buffer array

void setup()
{
Serial1.begin(19200); // the GPRS baud rate
Serial.begin(19200); // the Serial port of Arduino baud rate.
}

void loop()
{
if (Serial1.available()) // if date is comming from softwareserial port ==> data is comming from gprs shield
{
while (Serial1.available()) // reading data into char array
{
buffer[count++] = Serial1.read(); // writing data into array
if (count == 64)
break;
}

    for ( int j=0;j<count;j++)
    {
      Serial.write(buffer[j]);
    }
    clearBufferArray();              // call clearBufferArray function to clear the storaged data from the array
    count = 0;                       // set counter of while loop to zero
}
if (Serial.available())            // if data is available on hardwareserial port ==> data is comming from PC or notebook
    Serial1.write(Serial.read());       // write it to the GPRS shield

}

void clearBufferArray() // function to clear buffer array
{
for (int i=0; i < count; i++)
{
buffer[i] = NULL;
} // clear all index of array with command NULL
}[/code]