pic with AT command

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calin17us

Joined: 06 May 2009
Posts: 8

30 Jun 2009 11:40 pic at command

Im new here!!! i just want know if anybody could help me.

I useing SHT75 senzor and pic 16f877 for take the information, all of the information i have to send them to a computer with modem gsm.

i want to send and receive sms from my computer using AT command, but modem gsm is verry expensive, i want to know if is posibil to make one by my self, with a phone and pic.

my knowledge in this domain is lower.

GSM Man

Joined: 15 Apr 2009
Posts: 354
Helped: 46
Location: New Jersey, USA

30 Jun 2009 13:39 at commands pic

calin17us wrote:

i want to send and receive sms from my computer using AT command, but modem gsm is verry expensive, i want to know if is posibil to make one by my self, with a phone and pic.

You can get GSM modules fairly inexpensively. I sell the SIM340(quad-band) for $50. I also have a interface board that will be available in a couple of weeks that uses a PIC.

You can also look on Ebay (search for GSM module or GSM modem). Sparkfun.com sells a board that uses the Telit GM862, although the module alone cost about $100. Also, it uses a very small connector that is hard to solder.

There are plenty of other GSM modules available from various manufacturers. They all use the same AT command set for basic operations.

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30 Jun 2009 13:39 Ads

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 15:24 pic at commands

How much does it cost to run a GSM modem per month in the US?

GSM Man

Joined: 15 Apr 2009
Posts: 354
Helped: 46
Location: New Jersey, USA

30 Jun 2009 16:37 at commands for china phones

blueroomelectronics wrote:

How much does it cost to run a GSM modem per month in the US?

Do you mean 'what are the service provider fees'? The fees depend on what kind of contract you have and how many SMS messages or GPRS data you are transferring.

calin17us

Joined: 06 May 2009
Posts: 8

30 Jun 2009 18:19 building a gsm phone from scratch

It is a --- price, im from romania(europe), and until the produs arrive here, price is uper.

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 18:21 receive at commands avr

Ok what does it cost per month in Romania to have a GSM modem? It's not free.

calin17us

Joined: 06 May 2009
Posts: 8

30 Jun 2009 18:56 pic + commande at

It's up to mobil network. Y can tell you how it cost but after i will buy the parts y need it ... i promis y will tell you....ok

Added after 4 minutes:

i have one question the what is M2M technology?

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 18:56 sending at commands from atmega8 to gsm modem

You can't build a GSM modem. You must purchase one.

GSM Man

Joined: 15 Apr 2009
Posts: 354
Helped: 46
Location: New Jersey, USA

30 Jun 2009 19:19 modem gsm seriale ebay pic

calin17us wrote:

i have one question the what is M2M technology?

M2M means "Machine to Machine" - it is transferring data from one device to another, usually via Internet or Radio.

Added after 1 minutes:

blueroomelectronics wrote:

You can't build a GSM modem. You must purchase one.

You can build your own GSM modem - I have clients that have designed and build GSM radios from scratch. However, it does take a lot of specialized knowledge.

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 19:28 gprs at command avr

Got a schematic of a GSM modem?

Added after 5 minutes:

The silver square is a GSM modem, you know someone who has built a 2.4GHz GSM modem from scratch...?
pic with AT command

yasir9909

Joined: 22 Jun 2007
Posts: 45
Location: Pakistan

30 Jun 2009 20:04 i want the cheapest gsm modem

China made GSM modems can be purchased for as low as 25$ (USD) and service charges for GPRS/SMS packages for data transmission depend upon the rates set by the service provider cellular companies in your own local market.

In my country such GPRS/SMS packages are a low as 7$ per month.

The GSM modem which i utilize in GPRS/GSM based Vehicle Tracking system design cost me 25$ a piece.

I am using GSM modem of WISMO Quik.It is made in china.

regards
m.yasir

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 20:17 at command with pic

I think India has the cheapest rates anywhere for GSM modems & cell phones.

GSM Man

Joined: 15 Apr 2009
Posts: 354
Helped: 46
Location: New Jersey, USA

01 Jul 2009 0:19 programming pic conroller by atcommand

blueroomelectronics wrote:

The silver square is a GSM modem, you know someone who has built a 2.4GHz GSM modem from scratch...?
pic with AT command

Yes, I know people that design GSM radios for a living - but GSM does not operate on 2.4 GHz.

yasir9909

Joined: 22 Jun 2007
Posts: 45
Location: Pakistan

01 Jul 2009 8:37 build your own sim340

I don't know about indian products. however. what i have experienced is that such electronics products which are made in china and made in Taiwan are quite cheap with reasonably good quality of operation

arthur0

Joined: 28 Nov 2003
Posts: 73
Helped: 9
Location: Stockholm, Sweden

01 Jul 2009 9:08 at command modem pic

I've never tried this, but I don't see why you wouldn't be able to use a mobile phone to act as a GSM modem, provided it has the capability.
To check that it acts as a modem and answer to AT commands take a look here: http://www.developershome.com/sms/checkCommandSupport.asp
You'll then need to set up a proper serial interfae between your PIC and the phone, do some coding, send the right commands and you're done...
Noroc!

Arthur

calin17us

Joined: 06 May 2009
Posts: 8

04 Jul 2009 10:37 sht75 eebay

Hi a have a problem....one of my teachers want to substitute pic16F877(35 instr.) with ATMEGA8-16PU(135 instr.), he said is better. Dont know wath i should say him.

he ask me if ATMEGA8-16Pu suports AT commands, i dont know what to say...

yasir9909

Joined: 22 Jun 2007
Posts: 45
Location: Pakistan

04 Jul 2009 15:42 at command set pic

A micorocntroller has nothing to do with whether it supports 'AT commands' or not.

'AT commands' are supported by GSM modem and may or may not be supported by a mobile phone for sending and reading SMS from a modem or Mobile.

So it is perfectly OK whether you use PIC or AVR.
Microcontroller simply sends AT commands to the GSM modem as a string of characters or character by character.

As far as the superiority of AVR over PIC is concerned,i have experienced and as far as as my knowledge is concerned,I think AVR in general is better than PIC in terms of speed,peripherals and I/Os.

Both are competitors.For controlling GSM modem you can use either of them.

PIC is also a good controller,it's high end controllers like DSPIC etc. are good.A lot of support is available on PIC on internet.

However,i personaly like AVR and have good understanding of AVR.

regards
m.yasir

GSM Man

Joined: 15 Apr 2009
Posts: 354
Helped: 46
Location: New Jersey, USA

04 Jul 2009 21:03 sms at command receiving pic

yasir9909 wrote:

As far as the superiority of AVR over PIC is concerned,i have experienced and as far as as my knowledge is concerned,I think AVR in general is better than PIC in terms of speed,peripherals and I/Os.

And I think PIC is superior to AVR in speed, peripherals, I/O, cost, range of product offerings and support! Seriously, people will all have different opinions on what is the "best" processor. There are so many choices because not everyone agrees! The best processor is the one that meets YOUR REQUIREMENTS! Your best bet is to do the research and decide for yourself. Visit the manufacturers web sites and see what they have to offer in the way of training, app notes, development boards, and technical support. For your project there are hundreds of processors that you could use.

Just remember opinions are like rectums! Everyone has one and they all stink!

Find out why your teacher thinks the AVR is a better choice - he must have a reason. Although, I'd question his competence if he asks the question "if ATMEGA8-16Pu suports AT commands?". As yasir9909 says, that has nothing to do with the uP. Maybe your teacher is testing you.

yasir9909

Joined: 22 Jun 2007
Posts: 45
Location: Pakistan

04 Jul 2009 22:02 pic and at command

Quote:

The best processor is the one that meets YOUR REQUIREMENTS!

I think this is the most important fact that GSM Man has quoted.The choice of Processor solely depenends upon your requirement.

If the processor is meeting your requirments in terms of processing speed,No. of I/Os and other peripherals for interfacing your hardware that you want the processor to control then it does not matter whether you should use PIC or AVR.

In that case if your requirements are met you can use either of them.

If you feel comfortable with programming of PIC and have good understanding about architecture of PIC then there is no need to getting yourself entagled with the debate of either PIC is better or AVR is better.PIC also gives you a lot of choice in terms of internal memory,I/Os,processing speed and peripherals.

regards
m.yasir