SIMCOM SIM900 with Arduino Mega Help pls

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hi, trying little project part of security system. wanted send sms via simcom sim900 gsm/gprs shield when input of pir sensor high. read many article on how send sms work arduino uno using arduino mega. can point me in right direction pls. :'(  :'(  :'(

the shield using: http://www.ebay.com/itm/new-simcom-sim900-quad-band-gsm-gprs-shield-for-arduino-with-micro-sd-card-slot-/151121095914?hash=item232f84ecea:g:jj4aaoxyyvrsmkw0

hi,

no, sim900 shield cannot work when plugged on 2560.

this link explains why , shows how wire work.

http://hotresistor.blogspot.co.uk/2015/02/interfacing-simcom-sim900-with-arduino.html

looking @ picture of shield cannot see i/o port jumpers  , pins refer to.

typically  pin 7 , 8 have seen different ones, check states.

as metioned in link have downloaded schematic there slight differences ardunio shield, eg power switch, yes/no jumper ?

edit  - seems board used pins 2 , 3 instead of 7 , 8 software serial.
you need schematic find out pin used software  power on/off line


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