I am currently using a gsm module sim 300 (the link is this http://www.vegarobokit.com/index.php?route=product/product&product_id=482
being a beginner ... i used the code from this link http://tronixstuff.wordpress.com/2011/01/19/tutorial-arduino-and-gsm-cellular-part-one/
i connected the rx pin of sim300 to 3(tx) pin of arduino uno and tx to 2(rx) plus connected the gnd on both.
then powered the module by a 12 v adapter .
then uploaded the code from the tutorial above onto the arduino .
but the serial port is showing only the string "Starting SM5100B Communication..." and not getting any other commands .
i have also installed newsoftserial libraries.
i am able to call using hyperterminal by manually typing the commands like "atd ***********;" and is able to make a call.
plz help me with the code ... if its wrong
the link to datasheet of sim300 is "robokits.co.in/datasheets/SIM300_HD_V1.06.pdf"
i just want to make a call when a threshold value is reached which i get through a censor via the rx pin on arduino .