I am doing a fall detection system for my university final year project.If fall occured My Sensor device send a data to Arduino UNO through BLE.
Arduino UNO will call a number using SIM900. If opposite person answered the call Arduino UNO has to play a recorded wave file to SIM900 line in instantaneously.
My problem is i cant identify that receiving person answered the call There is no serial output coming when a person answered call.
How can I identify that opposite party has answered the call?? (I mean press green button on cellphone/ or raised the receiver in landphone)