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121  Using Arduino / Programming Questions / Re: Questions on a Seeed studio gprs shield v1.4 11A12 on: March 08, 2014, 12:25:36 pm
You are using the SoftwareSerial library to communicate with the SIM900 via pins 7 & 8. I found the following on the Software Serial page:

Quote
Not all pins on the Mega and Mega 2560 support change interrupts, so only the following can be used for RX: 10, 11, 12, 13, 14, 15, 50, 51, 52, 53, A8 (62), A9 (63), A10 (64), A11 (65), A12 (66), A13 (67), A14 (68), A15 (69).

Not 7 & 8.

I don't know if your SIM900 has the facility to use pins 0 & 1, then you can use Serial to talk to it, but you can't then communicate with the PC you are using.
122  Using Arduino / Programming Questions / Re: please can someone help me? on: March 08, 2014, 12:04:34 pm
Have a look at the 'Blink without delay' example.
123  Using Arduino / Project Guidance / Re: Standing/Sitting Desk Modulation Idea on: March 07, 2014, 04:38:42 pm
Quote
arduino, and a facial recognition sensor

Erm, if the idea is to do one with the other the Arduino doesn't have anything like the resources required.

The Arduino could look after the motors and the travel limiters...
124  Community / Bar Sport / Re: Denglish on: March 07, 2014, 02:21:18 pm
That reads almost as well as some of the spam I manage to get to read on here before the mods delete it!  smiley-wink
125  Using Arduino / Programming Questions / Re: Which product should I use? on: March 04, 2014, 06:33:15 pm
Thank you lar3ry.  I'd suspected the first part, the second left me - well, we have an amusement game called Whack-a-mole...
126  Using Arduino / Programming Questions / Re: Which product should I use? on: March 04, 2014, 06:06:50 pm
And it depends on what the thing is that you plan to mount it on. Does it create electrical interference? I presume there is some sort of motor on it?
127  Using Arduino / Programming Questions / Re: Which product should I use? on: March 04, 2014, 05:57:06 pm
Depends on distance. Bluetooth was designed to connect personal items together so has a limited range, personal experience when streaming music to bluetooth headphones in the house is about 10-15 feet.

128  Using Arduino / Programming Questions / Re: Which product should I use? on: March 04, 2014, 05:42:58 pm
Arduino Uno and GSM/GPRS shield. Search for the latter, lots of examples.
129  Using Arduino / Programming Questions / Re: Which product should I use? on: March 04, 2014, 05:29:00 pm
I'd like to be able to help but I haven't a clue what you are on about. Could you rephrase the question so it's more suitable for an international audience?
130  Using Arduino / Microcontrollers / Re: (why) is buying an original arduino a good thing? on: March 04, 2014, 04:07:35 pm
And it pays towards this forum.
131  Using Arduino / General Electronics / Re: arduino compatible GPS on: March 04, 2014, 01:53:04 pm
GPS? Weak signal? Where are you? The signal comes from satellites so I would have thought it should be fairly even across major land masses / the globe.
132  Using Arduino / Displays / Re: Arduino Uno + SeeedStudio Touch Shield + SeeedStudio SD Card Shield on: March 04, 2014, 01:35:28 pm
You could give http://www.seeedstudio.com/depot/contact_us.html a try for starters?
133  Using Arduino / Displays / Re: Arduino Uno + SeeedStudio Touch Shield + SeeedStudio SD Card Shield on: March 03, 2014, 04:44:41 pm
Have you tried contacting Seeed about the problem?
134  Using Arduino / Programming Questions / Re: Questions on a Seeed studio gprs shield v1.4 11A12 on: March 02, 2014, 03:43:21 pm
In very general terms:

First you need to decide how you are going to handle an incoming text. They can either be sent straight to the serial port of the modem, or to memory and a notification that one has been received sent to the serial port.

Once you have decided that you need to tell the modem using the AT+CNMI command.

Then you need to write the code to read the message from your chosen source, and act upon it.

Then send a message back to the sending number using the AT+CMGS command.

If you store the messages in memory you can typically store 50 messages on the sim so you need to consider some sort of housekeeping.
135  Using Arduino / Project Guidance / Re: Test GSM modem on: March 02, 2014, 03:27:41 pm
About half way down this http://www.seeedstudio.com/wiki/GPRS_Shield_V1.0 page is a script to load onto the Arduino. Connect the RX / TX pins to pins 7 & 8 of the Arduino and the Arduino to the computer, and then open the Serial Monitor. Don't forget that the modems do draw quite a bit of power when actually working, although it does remind you of that on the link you provided.

The script is a simple repeater. Whatever you type in the Serial Monitor will be sent to the SIM900, and anything received from the SIM900 will be relayed to the Serial Monitor. Check the baud rates before you begin.
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