Being used to program in Java at work, I still long to work on some embedded systems and firmware development in good old C. Moreover, the openness of some of the GSM phones amaze and attract me to do something with them, this is specially true for Sony-Ericsson and Siemens.

Hence, I planned for a generic security system with GSM integration, this could also be used as an add-on / plugin for other stand alone security systems to make them GSM enabled.

Implemented Features:

• Sending SMS messages to any cellphone
• Decode incoming SMS messages to extract text

Planned Features:

• Taking actions on the basis of incoming SMS
• Hooking up sensors for intrusion detection
• Controlling of devices via relays or optocoplers
• Stand-alone circuit design and implementation
• 220v AC power supply
• Power saving mode with wake-up via interrupts for automobile applications

Here you can see a SE T68i phone connected to a PJRC 8051 development board running the under-development firmware, the other serial port connects the the PC for interactive development under the PJRC monitor software.