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Did you change the GSM.h and HWSerial.h as defined in point 5 of the instructable?
I do not have any problem. Did you install the library's correctly? Did you change the GPRS lib from UNO to Mega?
Can you please post the error?
I took the Mega because of the memory. The library's that I used take a lot of space. Probably with some code optimisation you can fit everything in an Uno or Nano.
Hi, the setup must be more or less the same, I do not know your pcb version of SIM900A but if it is 5V tolurante, you can probably connect like I connected my GPS. Please see the schematic below.
I do not know how to use WhatsApp with this setup, if some other user come up with this fell free to share it where. There are some SMS internet services that can do this. I will try to update this program with some more changes and this will be one of them. But if costs are the problem, (at least in Germany) you can get SMS flat rate for very low fee per month. The Call action will not charge you anything because the system rejects the call automatically.
No the card that I used was a prepaid. But you also can use an monthly one.
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