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MAGIX: A GSM enabled security system driven by an 8051 microcontroller.

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.

Can you recognize that this is the same board as the previous post? Well now it has all the components anybody would ever need to learn every aspect of coding on this platform, really! It is a very simple and yet uses almost every pin/feature of the 8051. It is very cheap to build and covers the whole development life cycle of the controller just like for a production circuit, because you need to take out the chip and burn the new firmware then put it in again.

Features:

• 40-pin DIP controller 8052 or similar - ATmel being used here
• 12 MHz crystal
• Reset
• Buzzer
• LEDs on one port
• DIP switches on one port controlling the LEDs
• 5V regulator (can be powered by a 9V standard battery)
• 2 digit 7-segment display
• 2 push buttons, one to increment and one to decrement the number displayed
• RS-232 serial port can update numeric display and buzzer frequency, also send data of dip and push buttons to PC
• A simple PC application can show status of all connected peripherals