arduino and gsm interfacing

Question

hi, need some help here.

it confuses me how pin configs differ from one type of gsm module to another.

though i found that some gsm shields fits pecfectly (kinda) with arduino uno, i would like to replace it with arduino mega 2560.

can anyone tell me how to interface a gsm module (specifically e gizmo sim900D) with arduino mega 2560?

volly · Answer

aypii . Please attempt the following: If you are using Arduino Mega 2560, follow these steps. [1] How to switch between Arduino Mega and Arduino Uno? 1) Open GSM.h and comment-decomment the appropriate lines like below e.g. for Arduino Mega //#define UNO #define MEGA 2) If you use Arduino Uno comment the line in HWSerial.h or decomment if you are using Arduino Mega e.g. for Arduino Mega #define MEGA 3) Save and compile [2] How to switch between the old shield (that uses 4 and 5 pins for SoftwareSerial and the new (that used 2 and 3 pins)? 1) Open GSM.cpp and comment-decomment the appropriate lines like below e.g. for the new one //#define _GSM_TXPIN_ 4 //#define _GSM_RXPIN_ 5 #define _GSM_TXPIN_ 2 #define _GSM_RXPIN_ 3 2) Save and compile Connect the RX pin of your sim module to pin 18 of your arduino mega and the TX pin to pin 19 of the arduino mega. This is because the library uses Hardware serial for mega. Connect VIO pin of your sim module to IOREF pin of your arduino mega and the connect the GND of your sim module to GND of your arduino mega. That's all. I came across this somewhere very recently....give it a go and see if it works for you and let us know. You can also checkout this link.... Interfacing SIM900D GSM Module Board with Arduino Mega 2560 Regards, YV.

arduino and gsm interfacing

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