9 years, 10 months ago.

To Wei Zou

Hi Sir,

May I ask you a few things?

1. Is my connection right or wrong?

Mbed GPRS Shield

-VU to VIN

-GND to GND

-p9 to D0

-p10 to D1

2. May I kindly ask you that : Could I have a picture or a diagram of how you connect Mbed to Seeed GPRS Shield V2.0?

3. One more thing is: I do not know my SIM Card voltage type, whether it is 3V or 1.8V or 5V sir.

4. I do not insert the battery at the battery holder.

I used main.cpp program the one that you wrote.

1. include "mbed.h"
2. include "GPRSInterface.h"

/ On many platforms USBTX/USBRX overlap with serial on D1/D0 pins and enabling the below will interrupt the communication.

• You can use an LCD display to print the values or store them on an SD card etc.
• / Serial pc(USBTX, USBRX);

/**

• D1 - TX pin (RX on the WiFi side)
• D0 - RX pin (TX on the WiFi side)
• 115200 - Baud rate
• "apn" - APN name
• "username" - APN username
• "password" - APN passowrd
• /

GPRSInterface eth(D1, D0, 115200, "shppd", "", "");

int main() { printf("Hello\n"); wait(3);

Initialize the interface. If no param is passed to init() then DHCP will be used on connect() int s = eth.init(); if (s != NULL) { printf(">>> Could not initialise. Halting!\n"); exit(0); }

printf(">>> Get IP address...\n"); while (1) { s = eth.connect(); Connect to network

if (s == false || s < 0) { printf(">>> Could not connect to network. Retrying!\n"); wait(3); } else { break; } } printf(">>> Got IP address: %s\n", eth.getIPAddress());

Prepare the http request to mbed.org char http_cmd[] = "GET /media/uploads/mbed_official/hello.txt HTTP/1.0\n\n"; TCPSocketConnection sock; sock.connect("mbed.org", 80); sock.send_all(http_cmd, sizeof(http_cmd)-1); printf(">>> Sent request to mbed.org\n");

Read the response char buffer[300]; int ret; while (true) { ret = sock.receive(buffer, sizeof(buffer)-1); if (ret <= 0) break; buffer[ret] = '\0'; printf(">>> Received %d chars from mbed.org:\n%s\n", ret, buffer); } sock.close();

Disconnect from network eth.disconnect(); return 0; }

I am really looking forward to your reply Sir.

Thank you so much. I really need your help.

Regards Dorothy

Question relating to:

Last updated: 06 May 2014

9 29

wei zou / GPRSInterface

a library to use GPRS like ethernet or wifi, which makes it possible to connect to the internet with your GPRS module