A wireless security system including a portable security apparatus for communicating in a point-to-point manner with a personal communication device in order to allow transmission of a signal indicating an alarm condition by the personal communication device to a remote user and to allow remote configuration of the system,
but ae Simple Wireless Security System is a security system that includes a Zigbee wireless door sensor and a PC interface.The door sensor mounts near the garage doors, and it detects the open/closed state using reed switches and magnets. The Atmel Attiny45 microcontroller fits in nicely with design because of its small size, low pin count, low cost, and it has a powerful serial interface feature that can be set up as a UART â€œ the required interface for the Zigbee module. When a door opens or closes, the Attiny45 sends a message wirelessly to the PC interface. The PC interface consists of a standard WindowsXP PC and a USB adapter that includes a Zigbee wireless transceiver. The PC runs an application that receives messages from the door sensor and graphically shows the state of the security system by changing its icon in the system tray. Using the PCâ„¢s clock, an alert sound is played if the door is open during the middle of the night. The application runs in the background while the PC is used for other purposes.