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1  Using Arduino / Project Guidance / Re: Problems with Icomsat v1.1 SIM900 GSM/GPRS shield on: July 27, 2014, 05:25:54 am
Oh, and I am using an external power supply of 5v 2.5A. I believe that should be enough, as per the technical specs?
2  Using Arduino / Project Guidance / Re: Problems with Icomsat v1.1 SIM900 GSM/GPRS shield on: July 27, 2014, 05:23:51 am
Hi, thanks for the reply.

Reading your post and your code, I have one question, one thing I have been wondering about the whole time.
I know GSM Modem interacts with the Arduino using the Software Serial library on pins 2 and 3, but my understanding is that the GSM library already uses the Software Serial calls when I call up GSM library code. Or am I wrong, must I program the software serial communication myself and GSM library does not use it?

I'll go and try the code you gave me and see what happens

Speak later again.
3  Using Arduino / Project Guidance / Problems with Icomsat v1.1 SIM900 GSM/GPRS shield: SMS Issues on: July 25, 2014, 06:46:35 am
Hi, here are some issues I am having with my GSM/GPRS shield.

Problem statement 1:  >>>
I cannot send an SMS

Problem statement 2:  >>>
The GSM shield only connects to the carrier network when the USB cable is plugged to the pc, when I plug it out, it stays connected, but once I reset the modem and arduino it never connects again until I connect to the pc with usb cable and repeat the reset process.

The following are in place and have been tested:
1. The pin is correct
2. Used some diagnostics sketches and it displayed that it is connected to Vodacom-SA, which is correct. This tells me that the
    arduino is correctly communicating with the gsm modem.
3. Signal strength is 27/32 or something. A really good number.
4. The sim is allowed data and voice connections. It can send smses.
5. the send sms sketch executes with no issue, but the sms is just never sent/received, i don't know.
6. the sms.beginSMS(number) returns 0 <still executing>
7. the sms.endSMS() returns a 0 as well <still executing>
8. the gsmAccess.begin(pin) returns a 3 or a 0 sometimes. <0 = IDLE and 3 = GSM_READY>
9. I am sure the modem is running in synchronous mode, as when i change the mode to asynchronous, it never connects to the the carrier. Thus the above values fall under the values for asynchronous mode values.

I am sure there is someone out there whos sms's have gone through, please help me get my sms sent. I don't know where to look anymore, or what to look for.

Thanks
4  Using Arduino / Project Guidance / Re: Problems with Icomsat v1.1 SIM900 GSM/GPRS shield on: January 31, 2014, 11:21:01 pm
Hi,

I came right. I did not change my pin jumpers on the shield though. It connected to the cell network fine.
Thanks for the help.

just a quick question though, the cell number, in what format should it be entered when wanting to send sms's.
Here in South Africa we have two ways and sometimes the one is accepted and the other not:
1. 0723457658
2. +2723457658

5  Using Arduino / Project Guidance / Re: Problems with Icomsat v1.1 SIM900 GSM/GPRS shield on: January 22, 2014, 12:43:08 am
Hi there.

Great, glad I could help.
Just a quick question regarding your advise. Is this to solve the issue that my shield is not connecting to the cellular carrier?

I have not tried since I text you...
6  Using Arduino / Project Guidance / Re: Problems with Icomsat v1.1 SIM900 GSM/GPRS shield on: January 18, 2014, 06:08:50 am
Hi there,

I had the same issue, and as soon as I remove the shield from my uno, the program uploads fine with no issue.
Behind the scenes the GSM library is using the SoftwareSerial library to handle the serial comms between your arduino uno and the GSM shield.
If you have not yet tried it, change the pin selection on your shield to use pins 2 and 3. 2 for TX and 3 for rx.
I have found then that there is no communication error when trying to upload while the shield is attached to the uno.

I bought mine two days ago, but I on the other hand struggle to get mine connected to the cellular carrier.

Good luck further and please let me know if my info helped you.
7  Using Arduino / Project Guidance / Re: Gsm/Gprs Arduino Uno Shield Setup Challenges on: January 18, 2014, 01:21:47 am
Sorry for posting in the wrong section!  smiley-confuse
Any one have any pointers for my first two posts?

Thanks
8  Using Arduino / Project Guidance / Re: Gsm/Gprs Arduino Uno Shield Setup Challenges on: January 17, 2014, 11:44:22 am
The code says
If (GSM.begin(pinnumber) == GSM_READY) etc etc.
This statement resolves to false because the values 0 and 3 respectively. But for me to continue troubleshooting I need to know what these values indicate and what must I do to get them equal
9  Using Arduino / Project Guidance / Gsm/Gprs Arduino Uno Shield Setup Challenges on: January 17, 2014, 11:35:42 am
Hi Every One
I have just bought this shield, very excited to send my first sms and then go on to the more complex configurations, but first, after copying example code from the arduino website under GSM library., and connecting my shield to arduino and uploading the sketch, the serial output says not connected repeatedly in a delay of 1000.
I know why, as the value of GSM.begin(pinnumber) is 0 and the value of GSM_READY is 3. So obviously the processing behind the scenes are calculating correctly to give me those two values BUT, I have tried to Google support documents but can't find it. What does it mean when GSM.begin(pinnumber) = 0 and GSM_READY = 3? Where can I get this info and what error does this indicate?

Thanks for the help.
10  Using Arduino / Motors, Mechanics, and Power / Re: Reading power state on Arduino Uno on: October 24, 2012, 01:39:04 am
See attached drawing. This is how I interpert your advice. Is it correct?

thanks for your help!
11  Using Arduino / Motors, Mechanics, and Power / Re: Reading power state on Arduino Uno on: October 23, 2012, 01:50:40 pm
Hi, thanks for the reply.

I am not quite sure how the circuit will look.
So, I'll be connecting two resistors in series with the positive of my battery before it reaches the arduino.
Between the resistors i'm breaking out to my analogue input.
The diagram in your link I understand, but to apply it to the arduino I am not so sure how the wiring will work.
What happens to the ground indicated in the diagram, is that the negative of my battery or the ground for my analogue pin?
12  Using Arduino / Motors, Mechanics, and Power / Reading power state on Arduino Uno on: October 23, 2012, 12:20:03 am
Good Day,

Is there a way that one could read the power state of an Arduino Uno.
I want my remote unit to let me know when its power source, a battery, is running below a certain threshold.
 Please let me know if this is possible and how can it be achieved. Only by code, or with added hardware solution?

Thanks for the help. smiley
13  Using Arduino / Project Guidance / Using arduino on: October 17, 2012, 02:37:43 pm
Hello, is it possible that i could use arduino products just as they are in commercial products for my company?
14  Using Arduino / Installation & Troubleshooting / Re: Arduin Uno, Wireless Shield v1.1 & XBee2 on: October 12, 2012, 12:39:48 am
Hello spcomputing,

I do thank you so much for the help. My setup is working now. I think my problem was that I had two router end devices and no co-ordinator.
Also, on the shield for the now co-ordinator my serial pins were swopped around.
All is working now. Thanks alot hey.

Are you good with writing libraries? Cus the code I want to use on one of my projects are quite alot, I would like to simplify it with compacting some of the code into functions and then moving my code to a library spesific to my project so that the my code I write is not a long list of things, but rather short, sweet and understandable.

If you are up for it to help me, I will post my code.

Regards. smiley
15  Using Arduino / Installation & Troubleshooting / Re: Arduin Uno, Wireless Shield v1.1 & XBee2 on: October 09, 2012, 11:55:16 pm
Oh I see I did not answer your XBee question.
On the Xbee it says:
MODEL: XBee2
Description is: Xbee Series 2
In X-CTU it says its a XB24-ZB, Router AT, version 2264. That was the initial modem and firmware versions.
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