Search found 80 matches

by SebaS
Fri Nov 16, 2012 7:35 am
Forum: Wireless/RF
Topic: SIM900 GPRS doubts
Replies: 0
Views: 894

SIM900 GPRS doubts

Hello to all!! I can successfully transfer data with a Server. But I've seen a lot of ways to start a connection. Now, my goal is to make the device a little more roboust, to prevent malfunction Right now, the command sequence I use to connect to the server is: 1- AT+CGATT = 1 2- AT+CSTT="<apn>","<u...
by SebaS
Thu Sep 08, 2011 6:29 am
Forum: GPS
Topic: NMEA 0183 v3.0 Protocol
Replies: 0
Views: 997

NMEA 0183 v3.0 Protocol

Hi all!

I've got a GPS module that only supports NMEA 0183 v3.0 protocol... Do you know where I can find information about that protocol? I can't found anything related to v3.x

What I want to do is stop all output messages and query them only when needed to reduce power consumption

Thanks!!
by SebaS
Wed Jun 01, 2011 7:41 am
Forum: Wireless/RF
Topic: SIM340DZ spontaneous reset + can't change band
Replies: 0
Views: 701

SIM340DZ spontaneous reset + can't change band

Hello everybody... I've been years working with sim200, sim300 and sim340dz... But now I'm facing a problem. I'm having some troubles with sim340DZ.. It was working just fine... perfectly fine... Then one day it begins to reset itself after call ready is issued... RDY +CFUN: 1 +CPIN: READY Call Read...
by SebaS
Thu May 05, 2011 9:40 am
Forum: Code Snippets
Topic: Best GPRS Rx Buffer Management
Replies: 0
Views: 2017

Best GPRS Rx Buffer Management

Hi all everybody, I've been out for a while... But here I am wanting to start a discussion about: Which do you think is the best way for manage and process Data Arriving from a GPRS Module? GPRS modules communicate via AT commands sequences, wich begin and end with <CR> <LF> (0x0D 0x0A) 1- Do you th...
by SebaS
Wed Sep 22, 2010 9:47 am
Forum: PIC Microcontrollers - Software and Hardware
Topic: LCD 128x64 Can't Display Anything
Replies: 4
Views: 1675

Re: LCD 128x64 Can't Display Anything

I continue with my test and found this... void DISPLAY_initialization (void){ volatile byte i; // STEP 1 // Wait the power is stabilized delay(100); // STEP 2 // Toggle Reset DISPLAY_RESET = 1; delay (250); delay (250); DISPLAY_RESET = 0; delay (10); // STEP 3 // (11) LCD bias setting // (8) ADC sel...
by SebaS
Tue Sep 21, 2010 9:23 am
Forum: PIC Microcontrollers - Software and Hardware
Topic: LCD 128x64 Can't Display Anything
Replies: 4
Views: 1675

Re: LCD 128x64 Can't Display Anything

Well just messing around have achieve some improvements, but still can't display anything... I modify the initialization code in the following way: void DISPLAY_initialization (void){ delay(50); // Wait for Vcc to stabilize DISPLAY_sendCMD(cmd_DISPLAY_ADC); // set ADC (0xA0) DISPLAY_sendCMD(cmd_DISP...
by SebaS
Fri Sep 17, 2010 1:16 pm
Forum: PIC Microcontrollers - Software and Hardware
Topic: LCD 128x64 Can't Display Anything
Replies: 4
Views: 1675

Re: LCD 128x64 Can't Display Anything

Yes, I've verified that and it's ok... As well as the RESET pin transition at timing
by SebaS
Fri Sep 17, 2010 10:54 am
Forum: PIC Microcontrollers - Software and Hardware
Topic: LCD 128x64 Can't Display Anything
Replies: 4
Views: 1675

LCD 128x64 Can't Display Anything

Hi all! I've got a problem with a 128x64 display. It's part nº is WGM12864COG-32E, it uses the driver nº NT7532 I can't display ANYTHING... I guess it's an initialization problem. I've work with other 240x64 display and have no problem.. Well these display has 4 control lines and 7 for the bidirecti...
by SebaS
Mon Sep 21, 2009 7:26 am
Forum: Wireless/RF
Topic: GPRS can't connect to Server
Replies: 17
Views: 11433

Well... thanks to all... Problem solved!

It was a DNS problem... try with a different one and work just fine


Thanks again!
by SebaS
Thu Sep 17, 2009 10:07 am
Forum: Wireless/RF
Topic: GPRS can't connect to Server
Replies: 17
Views: 11433

Well... I've already test the server connectivity via telnet and works fine...

About, google, I think I had try it too and didn't work, but I'll try again because I don't remember...

I'll do the test and then let you know about them


Thanks!!!
by SebaS
Thu Sep 17, 2009 8:11 am
Forum: Wireless/RF
Topic: GPRS can't connect to Server
Replies: 17
Views: 11433

This is the command sequence: In bold is what the MCU sends, other commands are SIM340 module's replies. RDY +CFUN: 1 +CPIN: READY AT+IPR=9600 OK AT&W OK ATE0 OK AT OK AT+GSN <IMEI number> OK AT+CBAND=EGSM_DCS_MODE +CME ERROR: 765 AT+CMEE=1 OK AT+CGEREP=1 OK AT+CREG=1 OK AT+CGREG=1 OK AT+COPS=0 OK A...
by SebaS
Thu Sep 17, 2009 5:28 am
Forum: Wireless/RF
Topic: GPRS can't connect to Server
Replies: 17
Views: 11433

GPRS can't connect to Server

Hello everybody!! Well, I've been working with SIM200 a lot, since about a year and a half... At the beggining of the year I start using SIM340, because SIM200 is obsolete. For the SIM 200 I've made a software to connect via GPRS to a Server application made in Visual Basic. It worked fine, very fin...
by SebaS
Thu Aug 13, 2009 6:13 am
Forum: Wireless/RF
Topic: PCB built-in GSM antenna
Replies: 2
Views: 833

I've been researching and that type of antenna is a YAGI ANTENNA, an helical one.
http://en.wikipedia.org/wiki/Yagi-Uda_antenna

Does any of you know how to calculate it?



As always thanks in advance!
by SebaS
Wed Aug 12, 2009 4:47 pm
Forum: Wireless/RF
Topic: PCB built-in GSM antenna
Replies: 2
Views: 833

PCB built-in GSM antenna

Take a look at this antenna: http://www.olimex.com/dev/images/AVR/AVR-GSM-BOT.jpg from this module: http://www.olimex.com/dev/avr-gsm.html Do you guys know how can I build one of them? Or I was just think on "copy" that exact one... meassuring it from the picture and everything else... but if I can ...
by SebaS
Wed Aug 12, 2009 4:43 pm
Forum: Wireless/RF
Topic: Home made radio Reciever... AM or FM?
Replies: 4
Views: 1105

Home made radio Reciever... AM or FM?

Hello guys! I'm worknig for a new project.. actually is a birthday present for a friend of mine... As always please excuse my English... If I'm not wrong what I want to make is an "intercomunicator" (or something like that)... The idea is to build a device like a radio transmitter/receiver, so 2 peo...