Hi all,
I'm sorry if my question will be stupid.
I'd like manage my automatic gate by a SMS. I have arduino UNO plugged with this (Arduino GSM/GPRS Shield). So, I'm able to receive and analize message. The last step is give 5V to relè for open the gate!
I have tried with pin 13, but it seems not working. I can use every pin even if there is shield plugged on arduino?
Best regards
Obviously you can't use the pins you are using to communicate with the shield, and avoid pins 0 & 1 as they are used for serial communication, but yes, you can use any other pins. Personally I would avoid using 13 if possible because of the internal connection on the board to make the led blink!
One thought does occur to me though. I believe that according to the standards it can take up to five days for an SMS to be delivered. We all know from experience that normally it is virtually instantaneous but I have had SMS that take twenty minutes or more to be delivered.
Thank for your response.
about delay of sms travel your doubt is right. So I would like use this system only for open my home to eventually guest or worker when I'm not in home. In this modo I don't give the keys or some code.
If the gate doesn't open... someone will wait! 