Hey guys. I bought Sim900 module like this:
I wanted to test it and a problem occured. When I turn on module, it automatically powers off after a few seconds. If I remove SIM card or detach antenna, module stays on. So, I assume it powers down after it connects to network. As a power source, I'm using AC adaptor with 5V and 2A output as recommended.
Did anyone have a problem like this and knows how to solve?