It’s been awhile that I have last posted my projects here since I have helped my friends build their Senior Year Design Project. Now, it is finally done and I will be so happy to share it here. The project is all about a cellphone that will inform the user through Short Message Service (SMS) when an intruder triggered the alarm. Using the AT Commands the serial communication with the phone and the microcontroller was made possible.
The project comes into a case but temporarily removed for the presentation to the panel of judges since the case wont fit on the prototype.
There are two ways of sending and receiving SMS messages: by text mode and by PDU (protocol description unit) mode. The text mode (unavailable on this phone) is just an encoding of the bit stream represented by the PDU mode. The phone used was Sony Ericsson T68i and the only mode supported is PDU mode. It was a headache at first since I can only see hexadecimal figures but as time goes by I got used to it.