Hallo,
I watched the video and my test setup looked more or less the same. Except I use a COM1 RS232 convector in staid of an USB convertor… I powered the A7 module via USB connected to a 2 amp wall adapter and the RS232 convertor with 3.3 volt. After pressing the red power button on the shield I got the following responce on a terminal program on a Windows PC.
^CINIT: 1, 0, 0
^CINIT: 2, 32, 41891
^STN: 37
^CINIT: 4, 8192, 37
+CREG: 3
^CINIT: 8, 2048, 1
^CINIT: 16, 0, 1638420
^CINIT: 32, 0, 0
+CREG: 0
+CTZV:17/04/03,10:52:28,+02
+CREG: 5
+CTZV:17/04/03,10:53:36,+02
+CIEV: “MESSAGE”,1
+CMT: ,28
I got no responce after AT enter(=crlf) inputs.
Sending an SMS test massage via mobile phone resulted in:
0791135604880101040B911316817090F00000714030213553800AD4F29C0EA297E5F533 that looks good. I think.
Sending a second SMS message resulted in rubbish:
< À< <Àü <À<<8<À<<8À<ÀÀüüÀü<8 ðÀ üÀü<8 ðÀüÀÀ <8 À ÀÀüÀ<üÀ üÀÀüÀ<üÀ À <8<À ÀÀÀÀ<
À< ÿ< À< <Àü <ÀÀ<<À<ø<<8À ÀÀ À<À<<À<À<üÀ<< p <<À<8ÀÀ <8 À< À< ü À< <Àü <üÀ<
My problem: A7 does not response in AT inputs, if even does not give an error message
I have a working system with a Siemens TC35 GSM module and a separate GPS receiver controlled by a PIC microprocessor. A7 has both in one and is smaller…
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