Hello my friends!
I have bought 5 sim800c modules, but the are with strange V_TTL pin, and i can not make it communicate with arduino nano or USB-TTL. It is only blinking but not responding to any AT command. I have tried different combinations of wiring and braud rate, but no luck. I was thinkin that all of this modules are broken, but it strange not even single working. Can anyone help me? i guess i missing something.
Does the SIM800 connect to the 'phone network ?
I didn't connect the sim card yet. but anyway module should responde to AT command
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