I'm new to the Arduino so I got lots of questions on it as I am working on a project.
I'm having an Arduino Uno R3 and an Arduino GSM shield.
I got a 9V supply into the Arduino Uno as the Voltage satisfies orther part of my project as well. Arduino Uno can operate on 7-12V at the Vin pin
I read the note about the Arduino GSM shield and it says the board can only work with 5V supply.
So I wonder if I supply 9V to the Arduino Uno, then connect the GSM shield on top. Will it damage the Arduino GSM Shield? ( because all pins are connected, its connected to the Vin, 3.3V as well as 5V)
As long as you are connecting the 9 volts to the Arduino through the barrel socket, and thence the voltage regulator, no harm will come to either component. The arduino is a 5 volt device too.
Thanks for the reply, I know that the Arduino Uno got the voltage regulator built-in. Then any voltage between 7-12V will be regulated to 5V, is it correct?
Also, if I put in a squarewave to the analogue pin. Should I connect the wire on top of the GSM Shield? Because the shield is already on top of the Arduino.
And I wonder if you can help me with the programming?
Thanks for the reply, I know that the Arduino Uno got the voltage regulator built-in. Then any voltage between 7-12V will be regulated to 5V, is it correct?
That is correct.
Also, if I put in a squarewave to the analogue pin. Should I connect the wire on top of the GSM Shield? Because the shield is already on top of the Arduino.
Again, that is correct. The pins on the top shield connect to the ones on the bottom.
And I wonder if you can help me with the programming?
That's something we can help you with. Post your code, in code tags (use the '#' key). It might receive more attention if you start a new topic in the Programming section though.