Hello everybody,
I'm using the sim808 module in the image connected to arduino and I'd like to wake up arduino through interrupt when sim808 receives a call/sms, so I'm trying to find a pin on the module which is always high/low and changes state when receives incoming gsm traffic, I think I have to use the additional pins on the right (person the RI pin, which should be connected to the ring functionality) but I cannot find detailed specs, can you help me?