I have the A6 gsm mini module and I think I've done all the obvious things
- working SIM
- its own 5v 2A power supply
I connected to an Arduino Uno and ran various programs, including a debug code that tries to find the right baud rate. Nothing sensible was received from the module.
I tried the SSCOM32 test program, which produced the same results.
Basically the module sends data when it is initialised, but the data is interpreted as junk at whatever baud rate I try.
So I tried an oscilloscope.
I can see correct baud rates being used to send to the module.
However, the signal I see coming back (mainly at initialisation because it doesn't respond to anything I send) - the pulse width suggests a baud rate of about ten times the 'standard rate' of 115200 baud. ie I am seeing what looks like serial transmission but with pulses of around one microsecond.
I have tried sending multiple 'AT' at 115200 baud and other speeds in case it is in autobaud mode and can sense my speed, but no response.
I am baffled (or possibly missing something obvious of course!). Can anyone shed light on this.
Peter A