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Issue with program for SMS device switching project with PIC16F844

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djzbor

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i am doing a final project on switching devices by sending sms .My problem is programming the pic 16f84A in such a way that it can read the sms message from the phone memory interfaced to it.
My very problem is:
1-Let i send sms message"swich on motor" to the phone interfaced to the microcontroller ,remember the message can be stored in phone memory either in text mode or PDU mode.How do i know that it is in either of the two foramats?
2-if i want to read the message in what format can the microcontroller read it?text or Pdu?
3-i obtained from the internet that sms messages are in septets and the microcontroller needs octets should i do the decoding myself i.e program my microcontroller for decoding?
thanks,
 

sms device switching

yes in case of pdu u have to write algo for this,by the way there is a command for gsm modem wich tell u what format your gsm module is suport.
so no big essue
in case of text mode your yau have less work to do data will provided to your controller in meanning full manner.
so!! its batter for u that choose such gsm module which provide sms in text mode.
hope it will help
 

sms device switching

for easier interfacing use microcontrollers with built-in USART and crystal frequency with 0% error on 9600 bps or whichever speed you use, when modem is set to text mode (CMGF=1) data received are ASCII characters, no need for concern about septet decoding
 

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