SIM900 Vs TC35

[Jim90]

I would like to ask what is the advantages and disadvantages between SIM900 and TC35.

In terms of features, how easy is to programming,reliability,and others

[temtronic]

Ok, I'll take a stab at it...

NONE....

1) features...you have to decide what you NEED not what the device offers...

2) ease of programming...either is plain simple, easy to cut CCS C code.

3) reliability..same,providing you follow the mfr's specs for power,I/F,etc.

4) others.... grab the datasheets, do a side by side comparison.

Usually someone wants to buy the cheapest device, improperly attach to PIC (5v vs 3v), and incorrectly access device registers then figures out 'it don't work'...

Either device may do the job you want it to do, but YOU have to read a LOT of material, Google, etc. then decide which is right (or 'more better') for your application. Cost is a factor...are you needing 100s or thousands ?

You may find 'drivers' for them in the code library that others have written.

hth
jay

[Jim90]

I would like to use a GPRS application . this is the first time which i try to invole with gprs and so i don't have experience in this area :(

that's why i ask about the difference between these two modules.

Also i would need information about how gprs wotking (if someone has any information it wiould be very helpfull for me).

[ezflyr]

Hi,

Your request is very broad. Please tell us in specific terms what you want to do!

I have used the SIM 900 in a commercial application.

John

[Jim90]

I would like to implement a vehicle tracking system, and is needed to use a gprs module there.

Any resources about how gprs is working?

[dyeatman]

There are lots of resources available.
What compiler and chip family are you planing to use?
What do you want this "tracker" to do?
A PIC may or may not be suited for what you are planning...
_________________
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[Jim90]

"There are lots of resources available."
I don’t know where to start to be honest !!

"What compiler and chip family are you planing to use? "
I am thinking to use something from dspic33 chip family.

"What do you want this "tracker" to do? "
I want to collect data from gps and sent it through gprs

“A PIC may or may not be suited for what you are planning...”
Have you got anything else to suggest me ?

[temtronic]

1) Google with appropriate keywords will reply with hundreds of useful hits. You're NOT the first one doing this project.

2) from your description of 'get data..send data', dsPIC33 is way overkill. Almost any PIC with two hardware UARTs will do the task. My current PIC is the 18F46K22. 40 pins, 2 UARTs, lots of memory, peripherals, etc.

3) simple attach 1 UART to the GPS to acquire data, the other UART to the GPRS to send data.

4) if the project is as simple as #3 above, PICs are a great choice

!! Be sure to use an 'L' rated PIC (good for 3V operation) if your GPS and GPRS are 3V devices !! Saves 'headaches' of interfacing 5V PIC to 3V devices.


hth
jay

[dyeatman]

Thanks Jim90, now that we have that info determined, it looks like a
PIC 18F series or better will do the job nicely, especially a dsPIC. As
temtronic says, a PIC with two UARTS will make things real easy, and
I also like the "K" series chips he recommends.

It can be done with a 16F series but it would be somewhat harder without
two UARTS. If you are going to use a USB GPRS that will complicate
things quite a bit. Not recommended unless you use an add-on
hardware serial->USB converter to keep things simple.

Search the forum using just the word GPS and you will find a lot of info
including a chunk of code in the Code Library by PICoholic that parses
GPS message strings.

Search using GPRS to find a lot on sending to GPRS.

You can use an interrupt driven receive routine (that PICoholic provides)
and it should be pretty straightforward. Give it a shot and we will be
here to help if you run into coding issues.
_________________
Google and Forum Search are some of your best tools!!!!