I am using a Raspberry Pi model b+ to drive a wheelchair. I am running the motors through relay modules. The signal to the relay module is given from the Pi.
Also a GSM module and voice recognition module is connected to the Pi. As well as a heartbeat sensor. Earlier when I had connected jst, the voice module, relays and heartbeat sensor, it was working fine.
As soon as I connected the GSM module, the Pi suddenly stopped working. Can this be due to heating? How can I know if the Pi is salvageable or not? And due to what reasons could it have stopped working?