I am struggling to find, in my recently bought SIM5320E board, the RI PIN for the interrupt connection to my Arduino UNO.
the board is this one and I have already searched trough all the manuals without results.
{I still have some few doubts that the ON/OFF pin could also serve as a RI pin but...let's put this aside}
How can I discover the presence of that RI pin?
Is there a method for reading the signals and discerne them from those coming from a regular pin during a call or an incoming SMS etc.
I am planning to wire to the UNO all the pins and put some code to test the pins, but... i need some hint =)
(e.g. which side should this RI pin be? power side? digital side?, is there a common position in the SIM shields that could help me in testing time?)
thank you
Why do you need an interrupt when the board uses serial communications?
what does RI mean to you? Means nothing to me.
Paul
Paul_KD7HB:
Why do you need an interrupt when the board uses serial communications?
what does RI mean to you? Means nothing to me.
Paul
Boy, I am glad I am not the only one who doesn't know what RI means in this post.
RI could mean Rhode Island, but I don't think that's the intent. 
from the Harware Manual of the SIMCOM SIM5320... (see attached file) ...there is indication of this RI (Ring Indicator) pin, usually the same as one GPIO pin, which serves to send a signal to the interrupt pin on the arduino.
When an SMS (or a call) is received RI pin will go low for 120ms. It is wired to the micro-controller and is it being used to detect the SMS and hence wake up the micro-controller using an interrupt, saving more power (?).
Moreover, there is also a useful function in the FONA library that needs this interrupt connection for identifying the caller id number...
