Discussion in "Embedded GSM Development" started by    vinay1277    Dec 20, 2007.
Sun Dec 23 2007, 10:55 pm
My project will be something like this

Machine To Machine "M2M" Communication - A Data-Logger With GPRS Connection
by Martin THOMAS

In this project which is currently under development a data-logger samples data from various sources and transfers the information thru a wireless link to an internet-server. The device can be powered by battery and is optimised for minimal current draw. The main functions of this device:

Sample data from analog to digital converters which can be connected by RS485, SPI and I2C/TWI
Store the data on a memory card
Transfer the data to a internet-server by FTP or file-upload (RFC 1867) over GPRS
Send alarm messages on configurable events by Short Message Service (SMS) or e-mail
Time sychronisation from internet time-servers (RFC 868)
Minimum power for Battery supply
The hardware is based on an ARM7-architecture controller. Some of the used components are:

ARM7TDMI-S Controller Philips LPC2138 (maybe LPC214x or Atmel AT91SAM7xx with USB on future devices)
GSM/GRPS Module from the DAI Telecom Telit GM862 series
SD/MMC memory-card
RS485 connection for external data converters and signal conditioners
RS232 connection for firmware-updates (ARM and Modem), log- and debug-outputs
Power Supplies
Overvoltage and ESD protections
Components for power-saving
The Software is written an C, care has been taken to keep the code portable (early developments have been done on an ATmega128 based system). The tools from my WinARM collection are used (arm-elf-gcc et al). "Device-Drivers" in this software:

Interrupt-Driven UART with RTC/CTS Hardware flow-control for the GSM-Module
UART-Driver with Transmit/Receive switch for RS485-communication
SD-Card filesystem library (modified efsl)
GSM routines (SIM-PIN/Network-Connect)
GPRS routines (based on the Telit Easy-GRPS)
Routines to handle the RFC1867 protocoll
Routines to fetch the current time from the internet (RFC 868)
Routines to handle the ICP-DAS DCON-protocoll over RS485
RTC code for 32kHz XTAL
Battery monitor/ADC
Software-UART (3rd UART) for debug-output, monitoring and configuration



Currently there is no software an no schematic available for this project. But at least some pictures of the prototypes:

The first prototype is based on a Keil MCB2130 evaluation board. The RS485-modules and the GSM/GPRS module are connected externaly.

On the second prototype the GPRS/GSM-Modul is "On-board". All components have been selected for minimal power-demand



To my ARM-Projects page

To my Atmel AVR-Projects page

Martin Thomas


09181 hits since March 1, 2006
Last mod.: Tuesday, 28-Mar-2006 20:01:57 CEST

Sun Dec 23 2007, 11:00 pm
wow looks gr8....
did u read the previous post???

hope u can get hold on one such modems??
Sun Dec 23 2007, 11:07 pm
but well something kills my interest ......
this project is not for learners...
beginners can not get involved in these huge projects... what say???

Sun Dec 23 2007, 11:16 pm
Whats the obstruction ?
Why you wish to remain learner for very long ?
Prior to HOLI i will have it in my lab in my design in terms of hardware and software.
I have ARM board with accessories , 8051 board , GPRS modem a vision and determination to get it done in scheduled time frame . Above all i am getting support and copoperation from people like you and Kim.You can be a part in this mission. I am sure we can complete this so called 'Mission Impossible ' prior to HOLI.
I am on my part.
Sun Dec 23 2007, 11:25 pm
Mission Impossible???


Impossible not in my dictionary.....

and learner not talking abt me....

i have a company to take care of

i have a product almost like what u stated above already in production....
with group of people working under me both on Wavecom and simcom

well i was talking like... wud u make this project open????

even though u say no..

ive taken the idea ... will help u as far as i can

these 2 days were weekend will give feedback as sson as i get a lead...
Sun Dec 23 2007, 11:35 pm
Every time we have something to learn something to feel embarassed for and most imporatntly to read between the lines .
Fri Aug 08 2008, 01:52 pm
Dear Shyam,

I am using Wavecom modem (WMOD2) with GPRS capability. So far I succeed in sending SMS and placing call using this device with Hyperterminal and also from 8051.

Now I want to send a data string to the server.

FYI: I do have a domain name + hosting.

Can you please explain how can I achieve the same over HTTP?

Also, if you share the code for sending mail using SMTP..!

Fri Aug 08 2008, 02:23 pm
[moving thread to Embedded GSM Development]
Fri Aug 08 2008, 03:53 pm
hi say2paul
didnt work on WMOD
still can u tell me the firmware and the openAT SUITE that you are using?
Fri Aug 08 2008, 04:56 pm
he want to do it with At commands i think. you need to install WIPsoft in wavecom modem to make it working with at commands.

Shailesh will help you better in this.

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